阅读说明：本技术 钙钛矿墨水及其制备方法、显示面板 (Perovskite ink, preparation method thereof and display panel ) 是由 赵金阳 于 2019-08-26 设计创作，主要内容包括：本发明公开了一种钙钛矿墨水及其制备方法、显示面板,钙钛矿墨水包括钙钛矿前驱体以及溶剂；钙钛矿前驱体的分子式为(LX)<Sub>2</Sub>(SX)<Sub>n-1</Sub>(MX<Sub>2</Sub>)<Sub>n</Sub>；在结构分子式中,L为长链有机阳离子,S为短链有机阳离子；M为金属阳离子；X为卤素；n为任意大于0的自然数。本发明的钙钛矿墨水,具有优异的光学性能以及较好的成膜性,能够应用喷墨打印技术打印高浓度、高粘度的层状的钙钛矿墨水,能够有效的改善制备工艺,提高喷墨打印后形成的膜层质量。(The invention discloses perovskite ink, a preparation method thereof and a display panel, wherein the perovskite ink comprises a perovskite precursor and a solvent; the perovskite precursor has the molecular formula of (LX) 2 (SX) n‑1 (MX 2 ) n (ii) a In the structural molecular formula, L is a long-chain organic cation, and S is a short-chain organic cation; m is a metal cation; x is halogen; n is any natural number greater than 0. The perovskite ink disclosed by the invention has excellent optical performance and good film-forming property, can be used for printing high-concentration and high-viscosity layered perovskite ink by applying an ink-jet printing technology, can effectively improve the preparation process, and can improve the quality of a film layer formed after ink-jet printing.)

1. A perovskite ink is characterized by comprising

A perovskite precursor and a solvent;

the perovskite precursorHas a molecular formula of (LX)₂(SX)_n-1(MX₂)_n；

In the molecular formula, L is a long-chain organic cation, and S is a short-chain organic cation; m is a metal cation; x is halogen; n is a natural number greater than 0.

2. The perovskite ink of claim 1, wherein in the formula n is 2 to 7.

3. The perovskite ink of claim 1, wherein in the formula the metal cation is a group iv metal ion: any one of lead ions, germanium ions and tin ions;

the metal cation may also be a transition metal ion: any one of copper ions, nickel ions, cobalt ions, iron ions, manganese ions, chromium ions, palladium ions, cadmium ions, europium ions and ytterbium ions;

the short-chain organic cation is any one or combination of more of organic amine group methylamine, formamidine, organic complex with potassium ions, organic complex with rubidium ions and organic complex with cesium ions;

the halogen comprises at least one of bromine, chlorine and iodine;

the long-chain organic cation is selected from any one or more of the following organic groups:

4. the perovskite ink of claim 3,

when the perovskite ink is blue, the halogen is chlorine or the chlorine and the bromine are mixed;

when the perovskite ink is green, the halogen is bromine;

when the perovskite ink is red, the halogen is iodine or the iodine and the bromine are mixed.

5. The perovskite ink as claimed in claim 3, wherein the solvent is dimethylformamide or dimethylsulfoxide, and the concentration of the solvent is 10mg/ml to 1000 mg/ml.

6. A preparation method of perovskite ink is characterized by comprising the following steps:

respectively mixing the raw materials LX, SX and MX₂Mixing to form a perovskite precursor, wherein the perovskite precursor has a molecular formula of (LX)₂(SX)_n-1(MX₂)_n(ii) a Wherein L is a long-chain organic cation, S is a short-chain organic cation, M is a metal cation, and X is halogen;

adding the prepared perovskite precursor into a solvent to obtain a mixed solution;

heating the mixed solution to 60-80 ℃, and stirring for 1-2 hours until the perovskite precursor is completely dissolved;

and cooling the temperature to room temperature to obtain the perovskite ink.

7. A display panel, comprising

The backlight source is provided with a light emitting side; and

the color film substrate is arranged on the light emergent side of the backlight source and is provided with a color resistance layer, and the color resistance layer is made of the perovskite ink as set forth in any one of claims 1 to 5.

8. The display panel according to claim 7, wherein the color-resisting layer has a plurality of color-resisting regions arranged in a lattice; the perovskite ink is arranged in part or all of the color resistance region.

9. The display panel of claim 8, wherein the backlight provides ultraviolet light; when the perovskite ink is provided in all the color-resistant regions, wherein,

the color-resistant region of the perovskite ink having a red color shows a red color;

the color resistance region of the perovskite ink with green color shows green color;

the color-resistant region of the perovskite ink having a blue color shows a blue color.

10. The display panel of claim 8, wherein the backlight provides blue light; when part of color resistance areas are provided with the perovskite ink, and the rest color resistance areas are filled with transparent polymers; wherein the color-resistant region of the perovskite ink having a red color shows a red color; the color resistance region of the perovskite ink with green color shows green color; the color-resistant region with the transparent polymer shows blue color.

Technical Field

The invention relates to the field of displays and the like, in particular to perovskite ink, a preparation method thereof and a display panel.

Background

Perovskites are one of the most interesting luminescent materials in recent years, have the advantages of high luminous efficiency, high chromatographic purity, adjustable light-emitting wavelength and the like, and have great application value in the fields of solar cells, LEDs, lasers and the like. Also, the application thereof to a thin film transistor liquid crystal display (TFT-LCD) can greatly improve the color gamut range and color expressive power of the LCD display. At present, perovskite LCD display is becoming one of the important subjects for application research in the display technology field, however, the conventional three-dimensional perovskite-based materials still face the problems of poor stability, poor film forming quality and difficult processing, which all limit the practical application.

The traditional ink-jet printing technology has certain requirements on the viscosity and the concentration of an ink system, so that the traditional ink-jet printing technology is not suitable for printing the two-dimensional layered perovskite ink with high concentration and high viscosity. Therefore, there is a need to develop new inkjet printing methods to avoid clogging of the orifices by the perovskite to affect the manufacturing process.

Disclosure of Invention

In order to solve the technical problems: the invention provides perovskite ink, a preparation method thereof and a display panel, wherein the perovskite ink has excellent optical performance and good film forming property, so as to solve the problems of poor stability, poor film forming quality, difficulty in processing and the like of the existing perovskite material; meanwhile, the perovskite ink is applied to the color resistance layer of the color film substrate, so that the color resistance layer has good stability and high luminous efficiency.

The technical scheme for solving the problems is as follows: the invention provides perovskite ink, which comprises a perovskite precursor and a solvent; the perovskite precursor has a molecular formula of (LX)₂(SX)_n-1(MX₂)_n(ii) a In the molecular formula, L is a long-chain organic cation, and S is a short-chain organic cation; m is a metal cation; x is halogen; n is a natural number greater than 0.

In one embodiment of the present invention, in the formula, n is 2 to 7.

In one embodiment of the present invention, in the formula, the metal cation is a group iv metal ion: any one of lead ions, germanium ions and tin ions; and/or, transition metal ions: any one of copper ions, nickel ions, cobalt ions, iron ions, manganese ions, chromium ions, palladium ions, cadmium ions, europium ions and ytterbium ions; the short-chain organic cation is any one or combination of more of organic amine group methylamine, formamidine, organic complex with potassium ions, organic complex with rubidium ions and organic complex with cesium ions; the halogen comprises at least one of bromine, chlorine and iodine; the long-chain organic cation is selected from any one or more of the following organic groups:

in one embodiment of the present invention, when the perovskite ink is blue, the halogen is chlorine or a mixture of chlorine and bromine; when the perovskite ink is green, the halogen is bromine; when the perovskite ink is red, the halogen is iodine or a mixture of iodine and bromine.

In one embodiment of the present invention, the solvent is dimethylformamide or dimethylsulfoxide, and the concentration of the solvent is 10mg/ml to 1000 mg/ml.

The invention also provides a preparation method of the perovskite ink, which comprises the following steps: respectively mixing the raw materials LX, SX and MX₂Mixing to form a perovskite precursor, wherein the perovskite precursor has a molecular formula of (LX)₂(SX)_n-1(MX₂)_n(ii) a Wherein L is a long-chain organic cation, S is a short-chain organic cation, M is a metal cation, and X is halogen; adding the prepared perovskite precursor into a solvent to obtain a mixed solution; heating the mixed solution to 60-80 ℃, and stirring for 1-2 hours until the perovskite precursor is completely dissolved; and cooling the temperature to room temperature to obtain the perovskite ink.

The invention also provides a display panel, which comprises a backlight source and a light-emitting layer, wherein the backlight source is provided with a light-emitting side; and a color film substrate arranged on the light emergent side of the backlight source, wherein the color film substrate is provided with a color resistance layer, and the material of the color resistance layer is the perovskite ink as defined in any one of claims 1 to 5.

In an embodiment of the present invention, the color resistance layer has a plurality of color resistance regions arranged in a lattice; the perovskite ink is arranged in part or all of the color resistance region.

In an embodiment of the invention, the backlight source provides ultraviolet light; when the perovskite ink is arranged in all the color resistance areas, wherein the color resistance areas of the perovskite ink with red color display red color; the color resistance region of the perovskite ink with green color shows green color; the color-resistant region of the perovskite ink having a blue color shows a blue color.

In an embodiment of the present invention, the backlight provides blue light; when part of color resistance areas are provided with the perovskite ink, and the rest color resistance areas are filled with transparent polymers; wherein the color-resistant region of the perovskite ink having a red color shows a red color; the color resistance region of the perovskite ink with green color shows green color; the color-resistant region with the transparent polymer shows blue color.

The invention has the beneficial effects that: the perovskite ink disclosed by the invention has excellent optical performance and good film-forming property, can be used for printing two-dimensional or three-dimensional layered perovskite ink with high concentration and high viscosity by applying an ink-jet printing technology, can effectively improve the preparation process, and can improve the quality of a film layer formed after ink-jet printing. The preparation method of the perovskite ink is simple in preparation process. According to the display panel, the perovskite ink is applied to the color resistance layer of the color film substrate, so that the stability and the luminous efficiency of the color resistance layer are effectively improved, and the color gamut range and the color expressive force of the display panel are effectively improved.

Drawings

The invention is further explained below with reference to the figures and examples.

Fig. 1 is a schematic structural diagram of a display panel according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a display panel according to embodiment 2 of the present invention.

Wherein the content of the first and second substances,

1a display panel; 10 a backlight source;

20, a color film substrate; 21 a polarizer;

22 a planar layer; 23 color resist layer;

24 optical filter; 100 light-emitting side;

231a color-resisting area; 232 a black matrix;

231a first color resist region; 231b a second color-resist region;

231c a third color-resist region; 231d fourth color resist region;

231e a fifth color-resist region; 231f a sixth color-resist region; .

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.