阅读说明：本技术 有机光电装置及使用其的显示装置 (Organic photoelectric device and display device using the same ) 是由 张起砲 金炳求 姜基煜 李韩壹 郑成显 郑镐国 赵荣庆 柳银善 于 2018-06-15 设计创作，主要内容包括：本发明公开一种有机光电装置,所述有机光电装置包括面向彼此的阳极与阴极以及设置于阳极与阴极之间的有机层。所述有机层包括空穴注入层、空穴传输层、发光层及电子传输层中的一者。所述发光层包含由化学式1表示的第一主体、由化学式2表示的第二主体及由化学式3表示的磷光掺杂剂。一种包括所述有机光电装置的显示装置。(Disclosed are organic photoelectric devices including an anode and a cathode facing each other and an organic layer disposed between the anode and the cathode, the organic layer including of a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer, the light emitting layer including a th host represented by chemical formula 1, a second host represented by chemical formula 2 and a phosphorescent dopant represented by chemical formula 3. display devices including the organic photoelectric devices.)

An organic optoelectronic device of the kind , comprising:

an anode and a cathode facing each other; and

an organic layer disposed between the anode and the cathode,

wherein the organic layer comprises of hole injection layer, hole transport layer, light-emitting layer and electron transport layer

The light emitting layer includes an th host represented by chemical formula 1, a second host represented by chemical formula 2, and a phosphorescent dopant represented by chemical formula 3:

wherein, in chemical formula 1,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

L¹and L²Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl group, and

R^aand R²To R⁴Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl;

wherein, in chemical formula 2,

Y¹and Y²Independently a substituted or unsubstituted C6 to C20 aryl group or a substituted or unsubstituted C2 to C30 heterocyclyl group,

L³and L⁴Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

R^band R⁵To R⁸Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C6 to C20 aryl, or substituted or unsubstituted C2 to C30 heterocyclyl, and

m is an integer ranging from 0 to 2;

wherein, in chemical formula 3,

Z⁴to Z¹¹Independently N, C or CR^c，

Ring C is bonded to ring B by a C-C bond,

iridium is bonded to the ring B through an Ir-C bond, and

X²is O or S, and is a compound of,

R^cand R¹⁴To R¹⁹Independently hydrogen, deuterium, halogen, germanium group, cyano group, substituted or unsubstituted silane group, substituted or unsubstituted C1 to C10 alkyl group, substituted or unsubstituted C3 to C20 cycloalkyl group, substituted or unsubstituted C1 to C10 alkylsilyl group, substituted or unsubstitutedA substituted C6 to C20 aryl group or a substituted or unsubstituted C2 to C30 heterocyclic group, and

n is an integer ranging from 1 to 3.

2. The organic optoelectronic device according to claim 1, wherein the th host is represented by chemical formulas 1-3 or chemical formulas 1-4:

wherein, in chemical formulas 1 to 3 and 1 to 4,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

L¹and L²Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl group, and

R^aand R²To R⁴Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl.

3. The organic optoelectronic device according to claim 1, wherein the th host is represented by of chemical formulae 1-3a, 1-4a, and 1-4 b:

wherein, in chemical formulas 1 to 3a, 1 to 4a and 1 to 4b,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

L¹is a single bond or a substituted or unsubstituted C6 to C20 arylene,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl group, and

R^a、R²to R⁴Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl.

4. The organic optoelectronic device according to claim 3, wherein the th host is represented by of chemical formulae 1-3a-I, 1-3a-II, 1-3a-III, 1-4a-I, 1-4b-I, and 1-4 b-II:

wherein, in chemical formulas 1-3a-I, 1-3a-II, 1-3a-III, 1-4a-I, 1-4b-I and 1-4b-II,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

L¹is a single bond or a substituted or unsubstituted C6 to C20 arylene,

R¹is a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl group, and

R^a、R²to R⁴And R⁹To R¹³Independently of each otherIs hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl.

5. The organic photoelectric device according to claim 1, wherein Z of chemical formula 1¹To Z³Is N.

6. The organic photoelectric device according to claim 1, wherein R of chemical formula 1¹A substituent selected from group I:

[ group I ]

Wherein, in group I, is a connection point.

7. The organic optoelectronic device according to claim 1, wherein chemical formula 2 is in the structure of group II, and

*-L³-Y¹and-L⁴-Y²Is of the substituents of group III:

[ group II ]

[ group III ]

Wherein, in groups II and III, is a connection point.

8. The organic optoelectronic device according to claim 7, wherein chemical formula 2 is represented by chemical formula c-8 or chemical formula c-17 of group II, and

*-L³-Y¹and-L⁴-Y²Selected from group III.

9. The organic optoelectronic device according to claim 7, wherein chemical formula 2 is represented by chemical formula c-8 or chemical formula c-17 of group II, and

*-L³-Y¹and-L⁴-Y²B-1, B-2, B-3, B-11, B-16 and B-17 of group III.

10. The organic photoelectric device according to claim 1, wherein chemical formula 3 is represented by among chemical formula 3-1 to chemical formula 3-6:

wherein, in chemical formulas 3-1 to 3-6,

X²is O or S, and is a compound of,

R^c1、R^c2、R^c3and R¹⁴To R¹⁹Independently hydrogen, deuterium, halogen, germanium group, cyano group, substituted or unsubstituted silane group, substituted or unsubstituted C1 to C10 alkyl group, substituted or unsubstituted C3 to C20 cycloalkyl group, substituted or unsubstituted C1 to C10 alkylsilyl group, substituted or unsubstituted C6 to C20 aryl group, or substituted or unsubstituted C2 to C30 heterocyclic group, and

n is an integer ranging from 1 to 3.

11. The organic optoelectronic device according to claim 1, wherein the th host is represented by chemical formulas 1-3:

the second body is represented by chemical formula 2A:

wherein, in chemical formulas 1 to 3 and 2A,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group,

L¹to L⁴Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

R^aand R²To R⁸Independently is hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl or substituted or unsubstituted C6 to C20 aryl, and

Y¹and Y²Independently a substituted or unsubstituted C6 to C20 aryl or a substituted or unsubstituted C2 to C30 heterocyclyl.

12. The organic optoelectronic device according to claim 11, wherein the th host is represented by chemical formulas 1-3 a:

[ chemical formulas 1-3a ]

Wherein, in chemical formulas 1 to 3a,

X¹is O or S, and is a compound of,

Z¹to Z³Independently of each other, is N, or N,

L¹is a single bond or a m-phenylene group,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl group, and

R²to R⁴Independently hydrogen, deuterium,Cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl.

13. The organic photoelectric device according to claim 11, wherein chemical formula 3 is represented by chemical formula 3-1:

[ chemical formula 3-1]

Wherein, in chemical formula 3-1,

X²is O or S, and is a compound of,

R^c1、R^c2、R^c3and R¹⁴To R¹⁹Independently hydrogen, deuterium, halogen, substituted or unsubstituted silane groups, substituted or unsubstituted C1 to C10 alkyl groups, substituted or unsubstituted C1 to C10 alkylsilyl groups, or substituted or unsubstituted C6 to C20 aryl groups,

n is an integer ranging from 1 to 3, and

by "substituted" is meant that at least hydrogens of the substituent or compound are replaced with deuterium, halogen, C1 to C4 alkyl, or C6 to C12 aryl.

14, display device comprising the organic optoelectronic device of any one of claims 1-13, .

Technical Field

The invention discloses organic photoelectric devices and display devices.

Background

An organic photoelectric device (organic photodiode) is a device that converts electrical energy into light energy and vice versa.

The organic photoelectric devices may be classified according to their driving principle into types of photoelectric devices in which excitons are generated from light energy and the excitons are separated into electrons and holes and transferred to different electrodes to generate electric energy, and types of light-emitting devices in which voltage or current is supplied to the electrodes to generate light energy from electric energy.

Examples of the organic photodiode may be an organic photoelectric device, an organic light emitting diode, an organic solar cell, and an organic photosensitive drum (organic photosensitive drum).

Herein, the organic layer may include a light emitting layer and an auxiliary layer selectively disposed, and the auxiliary layer may be, for example, at least layers selected from a hole injection layer, a hole transport layer, an electron blocking layer, an electron transport layer, an electron injection layer, and a hole blocking layer.

The performance of an organic light emitting diode may be influenced by the characteristics of the organic layer, and among others may be mainly influenced by the characteristics of the organic material of the organic layer.

Specifically, it is required to develop organic materials capable of increasing hole and electron mobility while increasing electrochemical stability so that the organic light emitting diode can be applied to a large-sized flat panel display.

Disclosure of Invention

Technical problem

The embodiment of the invention provides organic photoelectric devices with high efficiency and long service life.

Another embodiment provides display devices including the organic photoelectric device.

Technical scheme

According to an embodiment, kinds of organic photoelectric devices include an anode and a cathode facing each other and an organic layer disposed between the anode and the cathode, wherein the organic layer includes of a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and the light emitting layer includes a th host represented by chemical formula 1, a second host represented by chemical formula 2, and a phosphorescent dopant represented by chemical formula 3:

in the chemical formula 1, the first and second,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

L¹and L²Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl group, and

R^aand R²To R⁴Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl;

wherein, in chemical formula 2,

Y¹and Y²Independently a substituted or unsubstituted C6 to C20 aryl group or a substituted or unsubstituted C2 to C30 heterocyclyl group,

L³and L⁴Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

R^band R⁵To R⁸Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C6 to C20 aryl, or substituted or unsubstituted C2 to C30 heterocyclyl,

m is an integer ranging from 0 to 2;

wherein, in chemical formula 3,

Z⁴to Z¹¹Independently N, C or CR^c，

Ring C is bonded to ring B by a C-C bond,

iridium is bonded to ring B via an Ir-C bond,

X²is O or S, and is a compound of,

R^cand R¹⁴To R¹⁹Independently hydrogen, deuterium, halogen, germanium group, cyano group, substituted or unsubstituted silane group, substituted or unsubstituted C1 to C10 alkyl group, substituted or unsubstituted C3 to C20 cycloalkyl group, substituted or unsubstituted C1 to C10 alkylsilyl group, substituted or unsubstituted C6 to C20 aryl group, or substituted or unsubstitutedOr unsubstituted C2 to C30 heterocyclyl, and

n is an integer ranging from 1 to 3.

According to another embodiment, display devices including the organic photoelectric device are provided.

Advantageous effects

kinds of organic photoelectric devices with high efficiency and long service life can be achieved.

Drawings

Fig. 1 and 2 are sectional views illustrating an organic light emitting diode according to an embodiment.

< description of symbols >

100. 200: organic light emitting diode

105: organic layer

110: cathode electrode

120: anode

130: luminescent layer

140: hole assist layer

Detailed Description

Hereinafter, examples of the present invention are explained in detail. However, these embodiments are exemplary, the invention is not limited thereto, and the invention is defined by the scope of the claims.

In the present specification, when a definition is not otherwise provided, "substituted" means that at least hydrogens of a substituent or compound are replaced with deuterium, halogen, hydroxyl, amine group, substituted or unsubstituted C1 to C30 amine group, nitro, substituted or unsubstituted C1 to C40 silyl group, C1 to C30 alkyl group, C1 to C10 alkylsilyl group, C6 to C30 arylsilyl group, C3 to C30 cycloalkyl group, C3 to C30 heterocycloalkyl group, C6 to C30 aryl group, C2 to C30 heteroaryl group, C1 to C20 alkoxy group, C1 to C10 trifluoroalkyl group, cyano group, or a combination thereof.

In examples of the present invention, "substituted" means that at least hydrogens of a substituent or compound are replaced with deuterium, a C1 to C10 alkyl group, a C6 to C20 aryl group, or a C2 to C20 heterocyclic group, further, in specific examples of the present invention, "substituted" means that at least hydrogens of a substituent or compound are replaced with deuterium, a C1 to C4 alkyl group, a C6 to C12 aryl group, or a C2 to C12 heterocyclic group.

In the present specification, when a definition is not otherwise provided, "hetero" means that 1 to 3 hetero atoms selected from N, O, S, P and Si are contained in functional groups and the rest are carbon.

In the present specification, when a definition is not otherwise provided, "alkyl" refers to an aliphatic hydrocarbon group. The alkyl group may be a "saturated alkyl group" without any double or triple bonds.

The alkyl group may be a C1 to C30 alkyl group. More specifically, the alkyl group may be a C1 to C20 alkyl group or a C1 to C10 alkyl group. For example, C1 to C4 alkyl groups may have 1 to 4 carbon atoms in the alkyl chain and may be selected from methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, second butyl and third butyl.

Specific examples of the alkyl group may be methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tertiary butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.

In this specification, "aryl" means a group comprising at least hydrocarbon aromatic moieties, all elements of which have p orbitals forming conjugates, such as phenyl, naphthyl and the like, two or more hydrocarbon aromatic moieties may be connected by sigma bonds and may be, for example, biphenyl, terphenyl, quaterphenyl and the like, and the two or more hydrocarbon aromatic moieties are directly or indirectly fused to provide a non-aromatic fused ring.

The aryl group can comprise a monocyclic, polycyclic, or fused-ring polycyclic (i.e., rings that share adjacent pairs of carbon atoms) functional group.

In this specification, "heterocyclyl" is a general concept of heteroaryl and may contain at least heteroatoms selected from N, O, S, P and Si in place of carbon (C) in a cyclic compound (e.g., aryl, cycloalkyl, fused rings thereof, or combinations thereof).

For example, "heteroaryl" may refer to aryl groups comprising at least heteroatoms selected from N, O, S, P and Si two or more heteroaryl groups are directly connected by sigma bonds, or when a heteroaryl group comprises two or more rings, the two or more rings may be fused, when a heteroaryl group is a fused ring, each ring may comprise 1 to 3 heteroatoms.

Specific examples of the heterocyclic group may include pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, quinolyl, isoquinolyl and the like.

More specifically, the substituted or unsubstituted C6-C30 aryl group and/or the substituted or unsubstituted C2-C30 heterocyclic group may be a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted condensed tetraphenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted p-terphenyl group, a substituted or unsubstituted m-terphenyl group, a substituted or unsubstituted o-terphenyl group, a substituted or unsubstituted terphenyl group

A group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted perylene group, a substituted or unsubstituted fluorene group, a substituted or unsubstituted indenyl group, a substituted or unsubstituted furyl group, a substituted or unsubstituted thienyl group, a substituted or unsubstituted pyrrolyl group, a substituted or unsubstituted pyrazolyl group, a substituted or unsubstituted imidazolyl group, a substituted or unsubstituted triazolyl group, a substituted or unsubstituted oxazolyl group, a substituted or unsubstituted thiazolyl group, a substituted or unsubstituted oxadiazolyl group, a substituted or unsubstituted thiadiazolyl group, a substituted or unsubstituted pyrazinyl groupA pyridyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted benzimidazolyl group, a substituted or unsubstituted indolyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted isoquinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinolizinyl group, a substituted or unsubstituted naphthyridinyl group, a substituted or unsubstituted benzoxazinyl group, a substituted or unsubstituted benzothiazinyl group, a substituted or unsubstituted azinyl group, a substituted or unsubstituted oxazinyl group, a substituted or unsubstituted phenothiazinyl group, a substituted or unsubstituted phenoxazinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted oxadiazinyl group, Substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl, or combinations thereof, but is not limited thereto.

In this specification, the hole characteristics refer to an ability to donate electrons to form holes when an electric field is applied, and due to a conduction characteristic according to a Highest Occupied Molecular Orbital (HOMO) level, holes formed in an anode may be easily injected into a light emitting layer, holes formed in a light emitting layer may be easily transported into the anode, and holes may be easily transported in the light emitting layer.

In addition, the electronic characteristics refer to an ability to accept electrons when an electric field is applied, and due to a conduction characteristic according to a Lowest Unoccupied Molecular Orbital (LUMO) level, electrons formed in the cathode may be easily injected into the light emitting layer, electrons formed in the light emitting layer may be easily transported into the cathode, and electrons may be easily transported in the light emitting layer.

Hereinafter, an organic photoelectric device according to an embodiment is explained.

The organic photoelectric device may be any device that converts electric energy into light energy and vice versa, but is not particularly limited, and may be, for example, an organic photoelectric device, an organic light emitting diode, an organic solar cell, an organic photosensitive drum, and the like.

Herein, examples of the organic light emitting diode as the organic photoelectric device are explained with reference to the drawings.

Fig. 1 and 2 are sectional views illustrating an organic light emitting diode according to an embodiment.

Referring to fig. 1, an organic light emitting diode (100) according to an embodiment includes an anode (120) and a cathode (110) facing each other and an organic layer (105) interposed between the anode (120) and the cathode (110).

The anode (120) may be made of a conductor having a large work function to aid hole injection, and may be, for example, a metal oxide, and/or a conductive polymer. The anode (120) may be, for example, a metal such as nickel, platinum, vanadium, chromium, copper, zinc, gold, or the like, or alloys thereof; metal oxides such as zinc oxide, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and the like; combinations of metals with oxides, e.g. zinc oxide (ZnO) with aluminium (Al) or tin dioxide (SnO)₂) And antimony (Sb); conducting polymers, e.g. poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene]Poly [3,4- (ethylene-1,2-dioxy) thiophene), PEDOT), polypyrrole and polyaniline, but are not limited thereto.

The cathode (110) may be made of a conductor having a small work function to aid in electron injection, and may be, for example, a metal oxide, and/or a conductive polymer. The cathode (110) may be, for example, a metal such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum、Silver, tin, lead, cesium, barium, and the like, or alloys thereof; multi-layer (multi-layer) structural materials, e.g. LiF/Al, LiO₂Al, LiF/Ca, LiF/Al and BaF₂But not limited thereto.

The organic layer (105) includes a light-emitting layer (130).

Fig. 2 is a cross-sectional view illustrating an organic light emitting diode according to another embodiment.

Referring to fig. 2, the organic light emitting diode (200) includes a hole auxiliary layer (140) in addition to the light emitting layer (130), the hole auxiliary layer (140) may further increase hole injection and/or hole mobility and block electrons between the anode (120) and the light emitting layer (130), the hole auxiliary layer (140) may be, for example, a hole transport layer, a hole injection layer, and/or an electron blocking layer, and may include at least layers.

Although not shown below, the organic layer (105) shown in fig. 1 or 2 may further include an electron injection layer, an electron transport auxiliary layer, a hole transport auxiliary layer, a hole injection layer, or a combination thereof.

The organic light emitting diode (100) and the organic light emitting diode (200) may be manufactured by: forming an anode or a cathode on a substrate; forming an organic layer using a dry film forming method such as a vacuum deposition method (evaporation), sputtering (sputtering), plasma plating (plasma plating), and ion plating (ion plating), or a wet coating method such as spin coating (dipping), and flow coating (flow coating); and forming a cathode or an anode on the organic layer.

An organic photoelectric device according to an embodiment includes an anode and a cathode facing each other, and an organic layer disposed between the anode and the cathode, wherein the organic layer includes at least of a hole injection layer, a hole transport layer, an emission layer, and an electron transport layer, and the emission layer includes a th host represented by chemical formula 1, a second host represented by chemical formula 2, and a phosphorescent dopant:

in the chemical formula 1, the first and second,

X¹is O or S, and is a compound of,

Z¹to Z³Independently is N or CR^a，

Z¹To Z³At least two of which are N,

L¹and L²Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

a is a substituted or unsubstituted carbazolyl group,

R¹is a substituted or unsubstituted C6 to C20 aryl groupA substituted or unsubstituted dibenzofuranyl or a substituted or unsubstituted dibenzothiophenyl group, and

R^aand R²To R⁴Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, or substituted or unsubstituted C6 to C20 aryl;

wherein, in chemical formula 2,

Y¹and Y²Independently a substituted or unsubstituted C6 to C20 aryl group or a substituted or unsubstituted C2 to C30 heterocyclyl group,

L³and L⁴Independently a single bond or a substituted or unsubstituted C6 to C20 arylene,

R^band R⁵To R⁸Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C6 to C20 aryl, or substituted or unsubstituted C2 to C30 heterocyclyl, and

m is an integer ranging from 0 to 2.

The organic photoelectric device according to the present invention increases material stability by introducing a triazine or pyrimidine moiety linked to dibenzofuran (or dibenzothiophene) as the th host and simultaneously introducing a carbazole moiety to obtain additional stability due to bipolar characteristics.

Specifically, biscarbazole is combined to serve as a second host and thus holes and electrons are balanced to achieve a long-life, low driving voltage characteristic.

Meanwhile, phosphorescent dopants are additionally combined, and thus combination matching such as stacking, energy transfer, and the like of the host and dopant materials can be ensured.

According to the formula dibenzofuran (or dibenzothiophene) with a nitrogen-containing hexagonal ring through L²The th body represented by chemical formula 1 may be represented by, for example, of chemical formula 1-1 to chemical formula 1-4.

In chemical formulas 1-1 to 1-4, X¹、Z¹To Z³、L¹、L²A and R¹To R⁴As described above.

In an exemplary embodiment of the present invention, the th body may be represented by chemical formula 1-1, chemical formula 1-3, or chemical formula 1-4, and preferably chemical formula 1-3 or chemical formula 1-4.

In a specific exemplary embodiment of the present invention, according to L²The chemical formula 1-1 can be represented by in chemical formula 1-1a, chemical formula 1-1b, and chemical formula 1-1c, for example.

In a specific exemplary embodiment of the present invention, according to L²The chemical formula 1-2 can be represented by in chemical formula 1-2a, chemical formula 1-2b, and chemical formula 1-2c, for example.

In a specific exemplary embodiment of the present invention, according to L²The chemical formulas 1 to 3 can be represented by, for example, in chemical formulas 1 to 3a, 1 to 3b, and 1 to 3 c.

In a specific exemplary embodiment of the present invention, according to L²The chemical formulas 1 to 4 can be represented by, for example, in chemical formulas 1 to 4a, 1 to 4b, and 1 to 4 c.

In chemical formulas 1-1a to 1-1c, 1-2a to 1-2c, 1-3a to 1-3c, and 1-4a to 1-4c, X¹、Z¹To Z³、L¹A and R¹To R⁴As described above.

In a specific exemplary embodiment of the present invention, the th body may be represented by of chemical formulae 1-1a, 1-3a, and 1-4b, such as of chemical formulae 1-3a, 1-4a, and 1-4b, and such as 1-3a, wherein the 3 rd position of dibenzofuran (or dibenzothiophene) is directly connected to the nitrogen-containing hexagonal ring.

The th host enhances hole and electron injection rates through LUMO expansion and planar expansion of ET moieties (e.g., triazine, pyrimidine, etc.) by including a structure in which 3-dibenzofuran (or 3-dibenzothiophene) is directly connected with a triazine or pyrimidine moiety as shown in chemical formulas 1-3a, and the th host exerts bipolar characteristics by introducing a carbazole moiety, thereby ensuring additional stability and improving glass transition temperature with respect to molecular weight and thus ensuring heat resistance.

In addition, biscarbazole as a second host may be combined with th host material to balance th host material having fast and stable electron transporting characteristics with second host material having fast and stable hole transporting characteristics, and thus a low driving voltage/long lifetime host set having a high glass transition temperature with respect to molecular weight is ensured.

Meanwhile, the host group and the phosphorescent dopant may be combined to secure the combination/matching advantages of accumulation, energy transfer, etc. of the host and dopant materials, and thereby obtain low driving voltage, long life, and high efficiency characteristics.

In exemplary embodiments of the present invention, the substituent a is a substituted or unsubstituted carbazolyl group, and may be represented by in formulae a-1 to a-5 according to a specific substitution point.

In the formulae A-1 to A-5, R⁹To R¹³Independently hydrogen, deuterium, cyano, substituted or unsubstituted C1 to C10 alkyl or substituted or unsubstituted C6 to C20 aryl, and¹the connection point of (a).

In a specific exemplary embodiment, R⁹To R¹³May independently be hydrogen or a substituted or unsubstituted C6 to C20 aryl group, and more specifically, R⁹To R¹³May independently be hydrogen or phenyl, for example, when A is represented by the formula A-1, R⁹To R¹²May be all hydrogen, or R⁹To R¹² in or both can be phenyl.

In addition, when A is represented by in the formulae A-2 to A-5, R is¹³Can be phenyl, and R¹⁰To R¹²All being hydrogen or R¹¹And R¹²At least of which can be phenyl.

Specifically, depending on the specific structure of substituent A, chemical formulas 1-3a may be represented by, for example, in chemical formulas 1-3a-I, 1-3a-II, 1-3a-III, 1-3a-IV, and 1-3a-V,

depending on the specific structure of substituent A, formulae 1-4a may be represented, for example, by in formulae 1-4a-I, formulae 1-4a-II, formulae 1-4a-III, formulae 1-4a-IV, and formulae 1-4a-V, and

depending on the specific structure of substituent A, chemical formulas 1-4b may be represented by, for example, in chemical formulas 1-4b-I, 1-4b-II, 1-4b-III, 1-4b-IV, and 1-4 b-V.

In the chemical formulae 1-3a-I to 1-3a-V, 1-4a-I to 1-4a-V, and 1-4b-I to 1-4b-V, X¹、Z¹To Z³、L¹、R¹To R⁴And R⁹To R¹³As described above.

The th body is preferably represented by of chemical formulas 1-3a-I, 1-3a-II, 1-3a-III, 1-4a-I, 1-4b-I, and 1-4b-II, and more preferably represented by of chemical formulas 1-3a-I, 1-3a-II, and 1-3 a-III.

In another aspect , in an exemplary embodiment of the invention, the composition of Z¹To Z³The constituent hexagonal rings may be pyrimidines or triazines, in certain exemplary embodiments wherein Z is¹And Z²Pyrimidines of N, in which Z¹And Z³Pyrimidines of N, in which Z²And Z³Pyrimidines of N or in which Z¹To Z³Triazines of N, and preferably wherein Z¹To Z³A triazine of N.

In exemplary embodiments of the invention, R¹May be a substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted dibenzofuranyl, or substituted or unsubstituted dibenzothiophenyl, and more specifically, R¹May be a substituted or unsubstituted phenyl, substituted or unsubstituted dibenzofuranyl or substituted or unsubstituted dibenzothiophenyl, and may, for example, be selected from substituents of group I.

[ group I ]

In group I, is the point of attachment of the nitrogen-containing hexagonal ring.

R¹Preferably phenyl or diBenzofuranyl or dibenzothienyl.

In exemplary embodiments of the invention, R^aAnd R²To R⁴May independently be hydrogen, deuterium, cyano or a substituted or unsubstituted C6 to C12 aryl group, more specifically R^aAnd R²To R⁴May independently be hydrogen, deuterium or cyano, and preferably, R^aAnd R²To R⁴All may be hydrogen.

Further, in the exemplary embodiment of the present invention, L¹And L²C6-C12 arylene groups which may independently be single bonds or substituted or unsubstituted, and more specifically, L¹And L²May independently be a single bond, m-phenylene or p-phenylene.

Further, in exemplary embodiments of the present invention, R⁹To R¹¹May independently be hydrogen, deuterium, cyano or a substituted or unsubstituted C6 to C12 aryl group, more specifically R⁹To R¹¹May independently be hydrogen, deuterium, cyano or phenyl, and preferably R⁹To R¹¹All being hydrogen, or R⁹To R¹¹At least of the above groups can be phenyl, more preferably, R⁹To R¹¹May be all hydrogen, or R⁹To R¹¹ in (1) can be phenyl.

The th body can be, for example, selected from the group 1 compounds, but is not limited thereto.

[ group 1]

In an exemplary embodiment of the present invention, regarding the second body, Y of chemical formula 2¹And Y²May independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted ditriphenylene group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzothienyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted fluorene group or a substituted or unsubstituted pyridyl group, L³And L⁴Independently a single bond, a substituted or unsubstituted phenylene group or a substituted or unsubstituted biphenylene group, R⁵To R⁸Independently hydrogen, deuterium, or a substituted or unsubstituted C6 to C12 aryl group, and m can be 0 or 1.

"substituted" of formula 2 means that at least hydrogens are replaced with deuterium, a C1 to C4 alkyl group, a C6 to C18 aryl group, or a C2 to C30 group.

In a specific exemplary embodiment of the present invention, chemical formula 2 may be in the structure of group II, and-L³-Y¹and-L⁴-Y² among the substituents of group III.

[ group II ]

[ group III ]

In groups II and III, is a connection point.

In specific exemplary embodiments of the present invention, chemical formula 2 may be represented by chemical formula c-8 or chemical formula c-17 of group II, and³-Y¹and-L⁴-Y²May be selected from group III.

Preferably, Y of chemical formula 2¹And Y²May independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group or a substituted or unsubstituted dibenzothiophenyl group, and more preferably, L-L³-Y¹and-L⁴-Y²Selected from group III B-1, B-2, B-3, B-11, B-16 and B-17.

The second body may, for example, be selected from a compound of group 2, but is not limited thereto.

[ group 2]

The th body and the second body may be applied as a composite.

The phosphorescent dopant may be a red phosphorescent dopant or a green phosphorescent dopant, and in an exemplary embodiment of the present invention, the phosphorescent dopant may be an organometallic compound represented by chemical formula 3:

[ chemical formula 3]

In the chemical formula 3, the first and second,

Z⁴to Z¹¹Independently N, C or CR^c，

Ring C is bonded to ring B by a C-C bond,

iridium is bonded to ring B via an Ir-C bond,

X²is O or S, and is a compound of,

R^cand R¹⁴To R¹⁹Independently hydrogen, deuterium, halogen, germanium group, cyano group, substituted or unsubstituted silane group, substituted or unsubstituted C1 to C10 alkyl group, substituted or unsubstituted C3 to C20 cycloalkyl group, substituted or unsubstituted C1 to C10 alkylsilyl group, substituted or unsubstituted C6 to C20 aryl group, or substituted or unsubstituted C2 to C30 heterocyclic group, and

n is an integer ranging from 1 to 3.

The composition including the th and second bodies may be combined with a phosphorescent dopant including a dibenzofuranyl group, a dibenzothienyl group, or a derivative including at least N of a dibenzofuranyl group and a dibenzothienyl group in a hexagonal ring of dibenzofuranyl and dibenzothienyl groups to ensure the combination/matching advantages of stacking, energy transfer, etc. of the bodies and the dopant material and thus obtain low driving voltage, long life, and high efficiency characteristics.

In an exemplary embodiment of the present invention, Z of chemical formula 3⁴To Z¹¹ of (a) may preferably be N, and two, three or four may be N.

The phosphorescent dopant may be represented by, for example, in chemical formula 3-1 to chemical formula 3-6.

In chemical formulas 3-1 to 3-6, X²、R¹⁴To R¹⁹And n is the same as above, and R^c1、R^c2And R^c3Same as R^c。

In a specific exemplary embodiment of the invention, R^c、R^c1、R^c2、R^c3And R¹⁴To R¹⁹Can be independently hydrogen, deuterium, halogen, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C1 to C10 alkylsilyl, or substituted or unsubstituted C6 to C20 aryl, for example, R^c、R^c1、R^c2、R^c3And R¹⁴To R¹⁹May independently be hydrogen, deuterium, halogen, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C1 to C10 alkylsilyl or substituted or unsubstituted C6 to C12 aryl, preferably, R^c、R^c1、R^c2、R^c3And R¹⁴To R¹⁹May independently be hydrogen, deuterium, halogen, a silane group substituted or not with deuterium or halogen, a methyl group substituted or not with deuterium or halogen, an isopropyl group substituted or not with deuterium or halogen, a tertiary butyl group substituted or not with deuterium or halogen, or a silane group substituted or not with C1 to C4 alkyl.

The phosphorescent dopant may be selected from, for example, a compound of group 3, but is not limited thereto.

[ group 3]

In a more preferred exemplary embodiment of the present invention, a composition including th hosts represented by chemical formula 1-3, second hosts represented by chemical formula 2A, and phosphorescent dopants represented by chemical formula 3-1 may be applied to the light emitting layer, and the chemical formula 1-3 may be, for example, chemical formula 1-3 a.

Z of chemical formula 1-3a¹To Z³May be all N, R¹May be a substituted or unsubstituted C6 to C20 aryl, substituted or unsubstituted dibenzofuranyl, or substituted or unsubstituted dibenzothiophenyl, and L¹It may be a single bond or m-phenylene. Y of chemical formula 2A¹And Y²May independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted m-biphenyl group, a substituted or unsubstituted p-biphenyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group, and L is³And L⁴Independently a single bond or a substituted or unsubstituted C6 to C20 arylene. And, R of chemical formula 3-1^c1、R^c2、R^c3And R¹⁴To R¹⁹May independently be hydrogen, deuterium, halogen, substituted or unsubstituted silyl, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C1 to C10 alkylsilyl, or substituted or unsubstituted C6 to C12 aryl.

More specifically, th and second bodies may be included in a weight ratio of 1:9 to 6:4, 2:8 to 6:4, and 3:7 to 6:4, more preferably th and second bodies may be included in a weight ratio of 1:9 to 5:5, 2:8 to 5:5, and 3:7 to 5:5, and most preferably th and second bodies may be included in a weight ratio of 3:7 to 5: 5.

For example, the phosphorescent dopant may be included in an amount of about 0.1 to 15 wt%, preferably 1 to 15 wt%, and more preferably 5 to 15 wt% based on 100 wt% of the composition of the th and second hosts, and the phosphorescent dopant may be included in an amount of about th and second hosts in a weight ratio of 3:7, and the phosphorescent dopant may be included in an amount of about 5 to 15 wt% based on 100 wt% of the composition of the th and second hosts.

The th host and the second host according to the present invention may contain a known phosphorescent dopant in addition to the above-mentioned phosphorescent dopant.

The known phosphorescent dopant may be a mixed organometallic compound including of Ir, Pt, Os, Ti, Or, Hf, Eu, Tb, Tm, Fe, Co, Ni, Ru, Rh, Pd, Or a combination thereof.

However, these phosphorescent dopants are for illustration, and the dopant exhibiting superior effects by combining the th host according to the present invention with the composition of the second host is the phosphorescent dopant represented by chemical formula 3.

Hereinafter, examples of known phosphorescent dopants may be organometallic compounds represented by chemical formula 401.

< chemical formula 401>

In chemical formula 401, M is selected from Ir, Pt, Os, Ti, Or, Hf, Eu, Tb and Tm; x₄₀₁To X₄₀₄Independently is nitrogen or carbon; a. the₄₀₁Ring and A₄₀₂The rings are independently selected from substituted or unsubstituted benzene, substituted or unsubstituted naphthalene, substituted or unsubstituted fluorene, substituted or unsubstituted spirofluorene, substituted or unsubstituted indene, substituted or unsubstituted pyrrole, substituted or unsubstituted thiophene, substituted or unsubstituted furan, substituted or unsubstituted imidazole, substituted or unsubstituted pyrazole, substituted or unsubstituted thiazole, substituted or unsubstituted thiophene, substituted or unsubstituted thiazole, substituted or unsubstituted fluoreneSubstituted isothiazoles, substituted or unsubstituted oxazoles, substituted or unsubstituted isoxazoles, substituted or unsubstituted pyridines, substituted or unsubstituted pyrazines, substituted or unsubstituted pyrimidines, substituted or unsubstituted pyridazines, substituted or unsubstituted quinolines, substituted or unsubstituted isoquinolines, substituted or unsubstituted benzoquinolines, substituted or unsubstituted quinoxalines, substituted or unsubstituted quinazolines, substituted or unsubstituted carbazoles, substituted or unsubstituted benzimidazoles, substituted or unsubstituted benzofurans, substituted or unsubstituted benzothiophenes, substituted or unsubstituted isobenzothiophenes, substituted or unsubstituted benzoxazoles, substituted or unsubstituted isoxazoles, substituted or unsubstituted triazoles, substituted or unsubstituted oxadiazoles, substituted or unsubstituted triazines, substituted or unsubstituted dibenzofurans and substituted or unsubstituted dibenzothiophenes, wherein "substituted" means that the substituted or unsubstituted isothiazoles refer to the substituted or unsubstituted aryl groups of at least 585826, , 35598, 35468 to 3655C 9, 369 to 369C 3, C3 to C3, C9 to C3C 9, C9 to C3C 9C 3C 4C 3C 9C 3C₄₀₁Is an organic ligand; xc1 is 1,2 or 3; and xc2 is 0, 1,2, or 3.

L₄₀₁Can be any monovalent, divalent or trivalent organic ligand. For example, L₄₀₁Can be selected from halogen ligands (e.g., Cl, F), diketone ligands (e.g., acetylacetonate, 1, 3-diphenyl-1, 3-propanedionate, 2,6, 6-tetramethyl-3, 5-heptanedionate, or hexafluoroacetonate), carboxylic acid ligands (e.g., picolinate, dimethyl-3-pyrazole carboxylate, benzoate), carbon oxide ligands, isonitrile ligands, cyano-site ligands, and phosphorus ligands (e.g., phosphine, phosphite), but are not limited thereto.

Q₄₀₁To Q₄₀₇、Q₄₁₁To Q₄₁₇And Q₄₂₁To Q₄₂₇May be independently selected from hydrogen, C1 to C60 alkyl, C2 to C60 alkenyl, C6 to C60 aryl, and C2 to C60 heteroaryl.

When A of formula 401 is₄₀₁Having two or more substituents, it may be reacted with A₄₀₁Two or more substituents of (a) combine to form a saturated or unsaturated ring.

When A of formula 401 is₄₀₂Having two or more substituents, it may be reacted with A₄₀₂Two or more substituents of (a) combine to form a saturated or unsaturated ring.

When xc1 of formula 401 is two or more, the plurality of ligands of formula 401

May be the same or different. When xc1 of chemical formula 401 is two or more, A₄₀₁And A₄₀₂A independently of the adjacent other ligands₄₀₁And A₄₀₂Either directly or through a linker (e.g., C1 to C5 alkylene, -N (R ') - (where R' is C1 to C10 alkyl or C6 to C20 aryl) or-C (═ O) -).

For example, known phosphorescent dopants may be selected from the compounds PD1 through PD75, but are not limited thereto:

the organic light emitting diode may be applied to an Organic Light Emitting Diode (OLED) display.

MODE OF THE INVENTION

Embodiments are described in more detail below with reference to examples. However, these examples should not be construed as limiting the scope of the invention in any way.

The starting materials and reactants used in the examples and synthesis examples were purchased from Sigma-Aldrich co.ltd. or echiee co.l. (TCI Inc.) or synthesized by known methods, unless otherwise noted.

Compounds which are specific examples of the present invention were synthesized by the following procedure.

(preparation No. Main body)

Synthesis example 1: synthesis of Compound B-1

[ reaction scheme 1]

a) Synthesis of intermediate B-1-1

30.0 g (64.2 mmol) of 2, 4-bis (3-bromophenyl) -6-phenyl-1, 3, 5-triazine was added to 100 ml of tetrahydrofuran, 100 ml of toluene and 100 ml of distilled water in a 500 ml round-bottomed flask, and 1.0 equivalent of dibenzofuran-4-boronic acid, 0.03 equivalent of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate were added thereto, and the mixture was heated and refluxed under a nitrogen atmosphere. After 6 hours, the reaction solution was cooled, the aqueous layer was removed therefrom, and the organic layer therein was dried under reduced pressure. The obtained solid was washed with water and hexane, and recrystallized from 300 ml of toluene to obtain 21.4 g (yield: 60%) of intermediate B-1-1.

b) Synthesis of intermediate B-1-2

15 g (46.55 mmol) of 4-bromo-9-phenylcarbazole (chemical abstracts service, cas) 1097884-37-1 was added to 200 ml of toluene in a 500 ml round-bottomed flask, 0.05 equivalent of dichlorodiphenylphosphinofferrocene palladium (dichlorodiphenylphosphinoferrofenecapalladium), 1.2 equivalents of bis (pinacolato) diboron and 2 equivalents of potassium acetate were added thereto, and the mixture was heated and refluxed for 18 hours under a nitrogen atmosphere, the reaction solution was cooled and dropped into 1 l of water, the solid obtained therefrom was dissolved in boiling toluene to treat activated carbon and then filtered using silica gel, and the filtrate obtained therefrom was concentrated, the concentrated solid was stirred with a small amount of hexane and filtered from to obtain intermediate B-1-2 in 80% yield.

c) Synthesis of Compound B-1

20 g (36.1 mmol) of intermediate B-1-1 are added to 100 ml of tetrahydrofuran and 50 ml of distilled water in a 500 ml round-bottom flask, 1.1 equivalents of intermediate B-1-2, 0.03 equivalents of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate are added thereto, and the mixture is heated and refluxed under a nitrogen atmosphere. After 18 hours, the reaction solution was cooled, and the solid precipitated therein was filtered and washed with 500 ml of water. This solid was recrystallized from 500 ml of monochlorobenzene (monochlorobenzene) to obtain 24 g of compound B-1.

Liquid Chromatography (LC)/Mass Spectrometry (MS) calculation yields: c₅₁H₃₂N₄O precise mass: 716.2576, Experimental value: 717.26[ M + H]

Synthesis example 2: synthesis of Compound B-13

[ reaction scheme 2]

1 equivalent of intermediate B-1-1, 1 equivalent of carbazole, 2 equivalents of sodium tert-butoxide and 0.05 equivalent of Pd₂(dba)₃0.2M in xylene, to which 0.15 equivalents of tri-tert-butylphosphine were added, and the mixture was refluxed and stirred for 18 hours. Methanol was added thereto in an amount of 1.5 times the amount of the solvent, the mixture was stirred, and the solid obtained therefrom was filtered and washed with 300 ml of water. This solid was recrystallized using monochlorobenzene to obtain compound B-13 in 85% yield.

LC/MS calculation yields: c₄₅H₂₈N₄O precise mass: 640.2263, Experimental value: 641.23[ M + H]

Synthesis example 3: synthesis of Compound B-17

[ reaction scheme 3]

a) Synthesis of intermediate B-17-1

15 g (46.4 mmol) of 4- (3-bromophenyl) -dibenzofuran (cas: 887944-90-3) were added to 200 ml of toluene in a 500 ml round-bottom flask, to which 0.05 equivalent of dichlorodiphenylphosphinofferrocene palladium, 1.2 equivalents of bis (pinacolato) diboron and 2 equivalents of potassium acetate were added, and the mixture was heated and refluxed for 18 hours under a nitrogen atmosphere, the solution was washed by extraction with water, the organic layer obtained therefrom was treated with activated carbon and filtered with silica gel, and the filtrate was concentrated, the concentrated solid was stirred with quant of hexane at and filtered to obtain intermediate B-17-1 in 85% yield.

b) Synthesis of intermediate B-17-2

9.04 g (40 mmol) of 2, 4-dichloro-6-phenyltriazine are added to 60 ml of tetrahydrofuran, 60 ml of toluene and 60 ml of distilled water in a 500 ml round-bottom flask, and 0.9 equivalent of intermediate B-17-1, 0.03 equivalent of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate are added thereto, and the mixture is heated and refluxed under a nitrogen atmosphere. After 6 hours, the reaction solution was cooled, and after removing an aqueous layer therefrom, an organic layer therein was dried under reduced pressure. The solid obtained therefrom was washed with water and hexane, and then recrystallized using 300 ml of toluene to obtain intermediate B-17-2 in a yield of 40%.

c) Synthesis of Compound B-17

1 equivalent of intermediate B-17-2, 1.1 equivalent of carbazole, 2 equivalents of sodium tert-butoxide and 0.05 equivalent of Pd₂(dba)₃0.2M in xylene, to which 0.15 equivalents of tri-tert-butylphosphine were added, and the mixture was refluxed and stirred for 18 hours. Methanol was added thereto at 1.5 times as much as the solvent, and the solid therein was filtered and washed with 300 ml of water. The solid was recrystallized from monochlorobenzene to give a yield of 80%Compound B-17.

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.21[ M + H]

Synthesis example 4: synthesis of Compound C-1

[ reaction scheme 4]

a) Synthesis of intermediate C-1-1

22.6 g (100 mmol) of 2, 4-dichloro-6-phenyltriazine are added to 100 ml of tetrahydrofuran, 100 ml of toluene and 100 ml of distilled water in a 500 ml round-bottomed flask, and 0.9 equivalent of dibenzofuran-3-boronic acid, 0.03 equivalent of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate are added thereto, and the mixture is heated and refluxed under a nitrogen atmosphere. After 6 hours, the reaction solution was cooled, and after removing an aqueous layer therefrom, an organic layer therein was dried under reduced pressure. The obtained solid was washed with water and hexane and recrystallized using 200 ml of toluene to obtain 21.4 g of intermediate C-1-1 with a yield of 60%.

b) Synthesis of Compound C-1-2

15 g (46.55 mmol) of 4-bromo-9-phenylcarbazole (cas: 1097884-37-1) were added to 140 ml of tetrahydrofuran and 70 ml of distilled water in a 500 ml round-bottom flask, 1.1 equivalents of 3-chlorophenylboronic acid, 0.03 equivalents of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate were added thereto, and the mixture was heated and refluxed under a nitrogen atmosphere. After 12 hours, the reaction solution was cooled, and the organic layer was extracted under reduced pressure to remove the solvent. The compound concentrated therefrom was treated by silica column chromatography to obtain intermediate C-1-2 in a yield of 85%.

c) Synthesis of intermediate C-1-3

12 g (33.9 mmol) of intermediate C-1-2 were added to 150 ml of xylene in a 500 ml round-bottom flask, to which 0.05 equivalent of palladium dichlorodiphenylphosphinoferrocene, 1.2 equivalents of bis (pinacolato) diboron and 2 equivalents of potassium acetate were added, and the mixture was heated and refluxed for 18 hours under a nitrogen atmosphere, the reaction solution was cooled and then washed by extraction with water, the organic layer obtained therefrom was treated with activated carbon and filtered with silica gel, and the filtrate obtained therefrom was concentrated, the solid concentrated therefrom was stirred with a small amount of hexane at and filtered to obtain intermediate C-1-3 in a yield of 75%.

d) Synthesis of Compound C-1

8 g (22.4 mmol) of intermediate C-1-1 was added to 80 ml of tetrahydrofuran and 40 ml of distilled water in a 500 ml round-bottom flask, 1.0 equivalent of intermediate C-1-3, 0.03 equivalent of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate were added thereto, and the mixture was heated and refluxed under a nitrogen atmosphere. After 18 hours, the reaction solution was cooled, and the solid precipitated therein was filtered and washed with 500 ml of water. This solid was recrystallized from 500 ml of monochlorobenzene to obtain 12 g of compound C-1.

LC/MS calculation yields: c₄₅H₂₈N₄O precise mass: 640.2263, Experimental value: 641.24

Synthesis example 5: synthesis of Compound C-2

[ reaction scheme 5]

a) Synthesis of intermediate C-2-1

15 g (46.4 mmol) of 3- (3-bromophenyl) -9-phenylcarbazole (cas: 854952-59-3) was added to 200 ml of toluene in a 500 ml round-bottom flask, 0.05 equivalent of dichlorodiphenylphosphinofencladium, 1.2 equivalents of bis (pinacolato) diboron and 2 equivalents of potassium acetate were added thereto, and the mixture was heated and refluxed for 18 hours under a nitrogen atmosphere, the reaction solution was cooled and dropped into 1 liter of water to collect a solid, the solid was dissolved in boiling toluene to treat activated carbon and was filtered using silica gel, and the filtrate obtained therefrom was concentrated, the concentrated solid was stirred with a small amount of hexane at and was filtered to obtain an intermediate C-2-1 with a yield of 85%.

b) Synthesis of Compound C-2

8 g (22.4 mmol) of intermediate C-1-1 according to Synthesis example 4 were added to 80 ml of tetrahydrofuran and 40 ml of distilled water in a 500 ml round-bottomed flask, 1.0 equivalent of intermediate C-2-1, 0.03 equivalent of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate were added thereto, and the mixture was heated and refluxed under a nitrogen atmosphere. After 18 hours, the reaction solution was cooled, and the solid precipitated therein was washed with 500 ml of water. This solid was recrystallized from 500 ml of monochlorobenzene to obtain 13 g of compound C-2.

LC/MS calculation yields: c₄₅H₂₈N₄O precise mass: 640.2263, Experimental value: 641.24

Synthesis example 6: synthesis of Compound C-12

[ reaction scheme 6]

8 g (22.4 mmol) of intermediate C-1-1 according to Synthesis example 4 were added to 80 ml of tetrahydrofuran and 40 ml of distilled water in a 500 ml round-bottomed flask, 1.0 equivalent of 9-phenyl-2- (4,4,5, 5-tetramethyl-1, 3, 2-dioxacycloalkaneborane-2-yl) -carbazole (cas: 1246669-45-3), 0.03 equivalent of tetrakis-triphenylphosphine palladium and 2 equivalents of potassium carbonate were added thereto, and the mixture was heated and refluxed under a nitrogen atmosphere. After 18 hours, the reaction solution was cooled, and the solid precipitated therein was filtered and washed with 500 ml of water. This solid was recrystallized from 500 ml of monochlorobenzene to obtain 11 g of compound C-12.

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, experimentThe value: 565.20

Synthesis example 7: synthesis of Compound C-16

[ reaction scheme 7]

a) Synthesis of intermediate C-16-1

Magnesium (7.86 g, 323 mmol) and iodine (1.64 g, 6.46 mmol) were added to 0.1 l Tetrahydrofuran (THF) under nitrogen, the mixture was stirred for 30 minutes, and 3-bromodibenzofuran (80 g, 323 mmol) dissolved in 0.3 l THF was slowly added dropwise thereto at 0 ℃ over 30 minutes, the mixed solution was slowly added dropwise to 29.5 g (160 mmol) of cyanuric chloride dissolved in 0.5 l THF over 30 minutes, after the reaction was heated to room temperature, the mixture was stirred for 1 hour and stirred under reflux for another 12 hours, after the reaction was cooled, water was slowly added thereto to complete the reaction, and the organic solvent obtained therefrom was concentrated under reduced pressure to obtain a solid, the solid was stirred with 200 ml of acetone from and filtered to obtain an intermediate C1-16% yield.

b) Synthesis of Compound C-16

Compound C-16 was synthesized according to the same method as in Synthesis example 2 using intermediate C-16-1.

LC/MS calculation yields: c₃₉H₂₂N₄O₂Accurate quality: 578.1743, Experimental value 579.20

Synthesis example 8: synthesis of Compound C-17

[ reaction scheme 8]

Compound C-17 was synthesized according to the same method as in synthesis example 2 using 1 equivalent of each of the intermediates C-1-1 and 3-phenyl-9H-carbazole.

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.20

Synthesis example 9: synthesis of Compound C-21

[ reaction scheme 9]

Compound C-21 was synthesized according to the same method as in Synthesis example 6, using 1.0 equivalent of each of intermediates C-1-1 and 9- (4- (4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -phenyl) -carbazole (Cas: 785051-54-9).

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.20

Synthesis example 10: synthesis of Compound C-22

[ reaction scheme 10]

Compound C-22 was synthesized according to the same method as in Synthesis example 6, using 1.0 equivalent of each of intermediates C-1-1 and 9- (3- (4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -phenyl) -carbazole (cas: 870119-58-7).

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.20

Synthesis example 11: synthesis of Compound C-25

[ reaction scheme 11]

a) Synthesis of intermediate C-25-1

Intermediate C-25-1 was synthesized according to the same method as in Synthesis example 2 using 1 equivalent of 3-phenyl-9H-carbazole and 1.2 equivalents of 3-chloro-1-bromobenzene.

b) Synthesis of intermediate C-25-2

Intermediate C-25-2 was synthesized according to the same method as in a) of Synthesis example 5 using intermediate C-25-1.

c) Synthesis of Compound C-25

Intermediate C-25 was synthesized according to the same method as in a) of Synthesis example 6 using 1.0 equivalent of each of intermediate C-25-2 and intermediate C-1-1.

LC/MS calculation yields: c₄₅H₂₈N₄O precise mass: 640.2263, Experimental value: 641.23

Synthesis example 12: synthesis of Compound B-14

[ reaction scheme 12]

a) Synthesis of intermediate B-14-1

Intermediate B-14-1 was synthesized according to the same method as in a) of Synthesis example 4 using 1 equivalent of 2, 4-dichloro-6-phenyltriazine and 0.9 equivalent of dibenzofuran-4-boronic acid.

b) Synthesis of Compound B-14

Intermediate B-14 was synthesized according to the same method as in Synthesis example 6 using 1.0 equivalent of each of intermediate B-14-1 and 9- (3- (4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -phenyl) -carbazole (cas: 870119-58-7).

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.20

Synthesis example 13: synthesis of Compound B-22

[ reaction scheme 13]

a) Synthesis of intermediate B-22-1

Intermediate B-22-1 was synthesized according to the same method as in a) of Synthesis example 4 using 1 equivalent of 2, 4-dichloro-6-phenyltriazine and 0.9 equivalent of dibenzofuran-2-boronic acid.

b)Synthesis of Compound B-22

Compound B-22 was synthesized in the same manner as in Synthesis example 6, using 1.0 equivalent of each of intermediate B-22-1 and 9- (3- (4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -phenyl) -carbazole (cas: 870119-58-7).

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.21

Synthesis example 14: synthesis of Compound B-25

[ reaction scheme 14]

a) Synthesis of intermediate B-25-1

Intermediate B-25-1 was synthesized according to the same method as in a) of Synthesis example 4 using 1 equivalent of 2, 4-dichloro-6-phenyltriazine and 0.9 equivalent of dibenzofuran-1-boronic acid.

b) Synthesis of Compound B-25

Compound B-25 was synthesized in the same manner as in Synthesis example 6, using 1.0 equivalent of each of intermediate B-25-1 and 9- (3- (4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -phenyl) -carbazole (cas: 870119-58-7).

LC/MS calculation yields: c₃₉H₂₄N₄O precise mass: 564.1950, Experimental value: 565.20

(preparation of second body)

Synthesis example 15: synthesis of Compound D-129

[ reaction scheme 15]

In a 500 ml round bottom flask equipped with a stirrer under a nitrogen atmosphere, 20.00 g (42.16 mmol) of 3-bromo-6-phenyl-N-biphenylcarbazole, 17.12 g (46.38 mmol) of N-phenylcarbazole-3-boronic acid ester were added to 175 ml of tetrahydrofuran: toluene (1:1) and 75 ml of a 2M aqueous potassium carbonate solution, 1.46 g (1.26 mmol) of tetrakis-triphenylphosphine palladium (0) was added thereto, and the mixture was heated and refluxed under a nitrogen flow for 12 hours. After completion of the reaction, the reaction mass was poured into methanol, and the solid therein was filtered, washed thoroughly with water and methanol and dried. The resulting material obtained therefrom was heated and dissolved in 700 ml of chlorobenzene, this solution was subjected to silica gel filtration to completely remove the solvent, and the solid obtained therefrom was heated and dissolved in 400 ml of chlorobenzene, and recrystallized to obtain 18.52 g of compound D-129 (yield 69%).

LC/MS calculation yields: c₄₂H₃₂N₂Accurate quality: 636.2565, Experimental value: 636.27

Synthesis example 16: synthesis of Compound D-137

[ reaction scheme 16]

6.3 g (15.4 mmol) of N-phenyl-3, 3-bicarbazole, 5.0 g (15.4 mmol) of 4- (4-bromophenyl) dibenzo [ b, d ] furan, 3.0 g (30.7 mmol) of sodium tert-butoxide, 0.9 g (1.5 mmol) of tris (dibenzylideneacetone) dipalladium and 1.2 ml of tris (tributylphosphine (50% in toluene) were mixed in 100 ml of xylene in a 250 ml round flask and the mixture was heated and refluxed for 15 hours under a nitrogen stream. To the obtained mixture was added 300 ml of methanol to crystallize a solid, which was filtered, dissolved in dichlorobenzene, filtered using silica gel/diatomaceous earth (Celite), and recrystallized using methanol after removing an appropriate amount of organic solvent to obtain intermediate D-137(7.3 g, yield 73%).

LC/MS calculation yields: c₄₈H₃₀N₂O precise mass: 650.2358, Experimental value: 650.24

Synthesis example 17: synthesis of Compound D-40

[ reaction scheme 17]

1 equivalent of N-phenyl-3, 3-bicarbazole and 1 equivalent of 3-bromo-9-phenylcarbazole were mixed together with 1.5 equivalents of sodium tert-butoxide, 0.03 equivalent of tris (dibenzylideneacetone) dipalladium and 0.06 equivalent of tributylphosphine with xylene (0.3M) in a 250 ml round flask, and the mixture was heated and refluxed for 15 hours under a stream of nitrogen. The obtained mixture was added to 300 ml of methanol to crystallize the solid, and the solid was filtered using silica gel/celite, dissolved in dichlorobenzene, and recrystallized using methanol after removing an appropriate amount of organic solvent to obtain compound D-40 in a yield of 60%.

LC/MS calculation yields: c₄₈H₃₁N₃Accurate quality: 649.2518, Experimental value: 649.25

(preparation of phosphorescent dopant)

Synthesis example 18: synthesis of Compound E-24

Dopant compound E-24 was prepared by the same reaction as above, except using the iridium complex described in reaction scheme 16 as the starting material in the process for preparing compound II-1 of US 2014-0131676.

[ reaction scheme 18]

(production of organic light emitting diode)

Example 1:

a glass substrate coated with Indium Tin Oxide (ITO) as a thin film 1500 angstroms thick was washed with distilled water, after washing with distilled water, the glass substrate was ultrasonically washed with a solvent such as isopropyl alcohol, acetone, methanol, etc. and dried, then moved to a plasma cleaner, cleaned for 10 minutes with oxygen plasma, and moved to a vacuum depositor using such obtained ITO transparent electrode as an anode, Compound A was vacuum-deposited on the ITO substrate to form a hole injection layer 700 angstroms thick, Compound B was deposited on the injection layer to 50 angstroms thick, and Compound C was deposited to 1020 angstroms thick to form a hole transport layer, on the hole transport layer, Compound C-1 as an -th host and Compound D-99 as a second host were vacuum-deposited, and 10 wt% of Compound E-24 as a phosphorescent dopant were vacuum-deposited to form a 400 angstroms thick, Compound C-1 and Compound D-99 were used at a weight ratio of 3:7, but in the following examples a ratio thereof was provided separately, and a luminescent layer was vacuum-deposited on the organic light emitting layer 300 angstroms thick, and an electron emitting layer was subsequently vacuum-deposited by vacuum-deposition of Li-1, Liq-8-H-Q-H-.

The organic light emitting diode has a five-layer organic thin layer, and specifically has the following structure: ITO/Compound A (700. ANG.)/Compound B (50. ANG.)/Compound C (1020. ANG.)/EML [ Compound C-1: Compound D-99: Compound E-24 (10% by weight) ] (400. ANG.)/Compound D: Liq (300. ANG.)/Liq (15. ANG.)/Al (1200. ANG.).

A compound A: n4, N4' -diphenyl-N4, N4' -bis (9-phenyl-9H-carbazol-3-yl) biphenyl-4, 4' -diamine.

Compound B: 1,4,5,8,9, 11-hexaazatriphenylene-hexacyanonitrile (HAT-CN).

Compound C: n- (biphenyl-4-yl) -9, 9-dimethyl-N- (4- (9-phenyl-9H-carbazol-3-yl) phenyl) -9H-fluoren-2-amine.

Compound D: 8- (4- (4, 6-bis (naphthalen-2-yl) -1,3, 5-triazin-2-yl) phenyl) quinoline.

Examples 2 to 23 and comparative examples 1 to 6

Each organic light emitting diode was manufactured according to the same method as example 1, except that the composition of the th host, the second host, and the phosphorescent dopant was changed to the respective compositions shown in table 1.

Evaluation 1: luminous efficiency and life increasing effect

The organic light emitting diodes according to examples 1 to 23 and comparative examples 1 to 6 were evaluated for their light emitting efficiency and life span characteristics. The measurement was specifically performed in the following manner, and the results are shown in table 1.

(1) Measuring current density variation as a function of voltage variation

Regarding the value of current flowing into the unit device, the obtained organic light emitting diode was measured while increasing the voltage from 0 volt to 10 volts using a current-voltmeter (Keithley)2400, and the measured current value was divided by the area to obtain the result.

(2) Measuring the change in brightness as a function of voltage

The luminance was measured using a luminance meter (Minolta) Cs-1000A) while the voltage of the organic light emitting diode was increased from 0 volt to 10 volts.

(3) Measuring luminous efficiency

The current efficiency (candela/ampere) at the same current density (10 milliamps/square centimeter) was calculated by using the brightness, current density, and voltage (volts) from items (1) and (2).

(4) Measuring life

The T90 lifetimes of the organic light emitting diodes according to examples 1 to 24 and comparative examples 1 to 6 were measured as the time when their luminance decreased to 90% relative to the initial luminance (candela/cm) after emitting light at 5000 candela/cm as the initial luminance (candela/cm) and measuring the decrease in luminance with time using a blanconi (Polanonix) lifetime measurement system.

(5) Measuring drive voltage

The driving voltage of each diode was measured at 15 milliamps/square centimeter using a current-voltage meter (gievi 2400).

[ Table 1]

Referring to Table 1, advantages are obtained in terms of driving voltage and lifespan when a material including DBX and carbazole is used as the host and biscarbazole is used as the second host, compared to the case of using only host or CBP as the second host, and in addition, when a compound E-24 including DBX bone as a phosphorescent dopant is used, Ir (ppy) as a phosphorescent dopant not including DBX bone is used₃In particular, when a structure in which the No. 3 position of dibenzofuran is directly connected to triazine is used as the th body, an effect of additionally lowering the driving voltage but additionally increasing the lifetime is obtained.

While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, it should be understood that the above-described embodiments are exemplary, and are not to be construed as limiting the invention in any way.