阅读说明：本技术 一种全光谱led光源 (Full-spectrum LED light source ) 是由 李明珠 苏佳槟 陈智波 刘俊鑫 于 2020-12-30 设计创作，主要内容包括：本发明提供一种全光谱LED光源,包括激发源蓝光芯片和发射源荧光粉,蓝光芯片包括第一LED芯片、第二LED芯片、第三LED芯片及第四LED芯片,第一LED芯片、第二LED芯片、第三LED芯片和第四LED芯片依次串联；荧光粉包括黄绿色荧光粉、第一红色荧光粉和第二红色荧光粉。本发明通过蓝光芯片和荧光粉合理搭配有效发挥他们之间的协同作用,使得LED光源的光谱连续性好,更接近于太阳光谱,R1-R15中每个参数均高达90以上,其显色指数Ra、CRI大于97,且有效提高荧光粉转换效率,从而提升光效。克服了现有技术的弊端,降低蓝光强度,从而减少蓝光危害,可应用于任何需要照明的场所,实用性更强,结构简单,设计合理。(The invention provides a full-spectrum LED light source which comprises an excitation source blue light chip and emission source fluorescent powder, wherein the blue light chip comprises a first LED chip, a second LED chip, a third LED chip and a fourth LED chip, and the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are sequentially connected in series; the fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. The blue light chip and the fluorescent powder are reasonably matched to effectively play a synergistic effect of the blue light chip and the fluorescent powder, so that the spectrum continuity of an LED light source is good and is closer to the solar spectrum, each parameter in R1-R15 is up to more than 90, the color rendering indexes Ra and CRI are more than 97, the conversion efficiency of the fluorescent powder is effectively improved, and the light efficiency is improved. The shortcoming of the prior art is overcome, blue light intensity is reduced to reduce blue light harm, can be applied to any place that needs the illumination, the practicality is stronger, simple structure, reasonable in design.)

1. A full spectrum LED light source, comprising: the LED fluorescent lamp comprises an excitation source blue light chip and emission source fluorescent powder, wherein the blue light chip comprises a first LED chip, a second LED chip, a third LED chip and a fourth LED chip, and the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are sequentially connected in series; the fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder.

2. The full spectrum LED light source of claim 1, wherein: the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are forward chips, flip chips or vertical chips.

3. The full spectrum LED light source of claim 1, wherein: the dominant wavelength of the first LED chip is 440-455 nm, the dominant wavelength of the second LED chip is 455-470 nm, the dominant wavelength of the third LED chip is 380-440 nm, and the dominant wavelength of the fourth LED chip is 470-495 nm.

4. A full spectrum LED light source as set forth in claim 3, wherein: the proportion of the first LED chips to the total number of the chips is 33.3% + -5%, the proportion of the second LED chips to the total number of the chips is 25% + -5%, the proportion of the third LED chips to the total number of the chips is 25% + -5%, and the proportion of the fourth LED chips to the total number of the chips is 16.7% + -5%.

5. The full spectrum LED light source of claim 4, wherein: the third LED chip is arranged on the outer ring, the first LED chip and the third LED chip are arranged adjacently, and the second LED chip and the third LED chip are arranged adjacently.

6. The full spectrum LED light source of claim 1, wherein: the peak wavelength of the yellow-green fluorescent powder is between 510nm and 530nm, the peak wavelength of the first red fluorescent powder is between 625nm and 640nm, and the peak wavelength of the second red fluorescent powder is between 645nm and 665 nm.

7. The full spectrum LED light source of claim 6, wherein: the half-wave width of the yellow-green fluorescent powder is 100nm +/-5 nm, and the particle size is 22 mu m +/-5 mu m; the half-wave width of the first red fluorescent powder is 88nm +/-5 nm, and the particle size is 22 microns +/-5 microns; the half-wave width of the second red fluorescent powder is 89nm +/-5 nm, and the particle size is 22 mu m +/-5 mu m.

8. The full spectrum LED light source of claim 1, wherein: the yellow-green phosphor material system is aluminate, and the first red phosphor material system and the second red phosphor material system are silicon-based nitride.

9. The full spectrum LED light source of claim 6, wherein: the yellow-green fluorescent powder accounts for 88-97.5% of the total fluorescent powder by mass, the first red fluorescent powder accounts for 0.5-3% of the total fluorescent powder by mass, and the second red fluorescent powder accounts for 2-9% of the total fluorescent powder by mass.

10. The full spectrum LED light source of claim 1, wherein: the synthesis process of the second red fluorescent powder is a direct synthesis process.

Technical Field

The invention relates to the technical field of LED packaging, in particular to a full-spectrum LED light source.

Background

With the development of the LED lighting technology, people no longer only simply pursue LED products with high luminous efficiency and high cost performance. People put higher demands on the aspects of photobiosafety, health illumination and the like. The most common illumination of the human eye is sunlight, and the spectrum of sunlight can be referred to as the full spectrum. The full spectrum refers to a spectrum curve containing ultraviolet light, visible light and infrared light in the spectrum, the proportion of red, green and blue in the visible light part is similar to that of sunlight, and the color rendering index is close to 100.

At present, more and more full spectrum methods are realized, people do not independently pursue parameters R1-R15>90, and attention is paid to a healthy LED light source with improved light efficiency. In the current technical scheme, nitrogen oxide green powder with 490-500nm waveband is generally added for R12, but due to poor structural stability of the fluorescent powder, the reliability of the LED is greatly reduced after use, and the excitation efficiency of the fluorescent powder with the waveband is too low at present. And a single or multi-wave blue light chip excites various fluorescent powders, but the conversion efficiency of the fluorescent powder used by the method is low, particularly the red fluorescent powder is used. Certainly, a purple light chip is used for exciting the fluorescent powder, although the method can reduce the peak intensity of blue light to reduce the harm of the blue light, the purple light is harmful to human bodies, and meanwhile, the purple light chip is high in cost and limited in efficiency of exciting the fluorescent powder, so that the product does not have the advantages of cost performance and parameters.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a full-spectrum LED light source which effectively improves the conversion efficiency of fluorescent powder, improves the light efficiency, has good spectrum continuity, is close to the packaging of a sunlight full-spectrum LED light source, overcomes the defects of the prior art, reduces the blue light intensity, reduces the harm of blue light, is close to sunlight in all full spectrums, can be applied to any places needing illumination, and has stronger practicability.

The invention provides a full-spectrum LED light source which comprises an excitation source blue light chip and emission source fluorescent powder, wherein the blue light chip comprises a first LED chip, a second LED chip, a third LED chip and a fourth LED chip, and the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are sequentially connected in series; the fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder.

Further, the first LED chip, the second LED chip, the third LED chip, and the fourth LED chip are forward mounted chips, flip chips, or vertical chips.

Further, the dominant wavelength of the first LED chip is 440nm to 455nm, the dominant wavelength of the second LED chip is 455nm to 470nm, the dominant wavelength of the third LED chip is 380nm to 440nm, and the dominant wavelength of the fourth LED chip is 470nm to 495 nm.

Further, the proportion of the first LED chips to the total number of chips is 33.3% + -5%, the proportion of the second LED chips to the total number of chips is 25% + -5%, the proportion of the third LED chips to the total number of chips is 25% + -5%, and the proportion of the fourth LED chips to the total number of chips is 16.7% + -5%.

Further, the third LED chip is arranged on the outer ring, the first LED chip and the third LED chip are arranged adjacently, and the second LED chip and the third LED chip are arranged adjacently.

Further, the peak wavelength of the yellow-green phosphor is between 510nm and 530nm, the peak wavelength of the first red phosphor is between 625nm and 640nm, and the peak wavelength of the second red phosphor is between 645nm and 665 nm.

Further, the half-wave width of the yellow-green fluorescent powder is 100nm +/-5 nm, and the particle size is 22 microns +/-5 microns; the half-wave width of the first red fluorescent powder is 88nm +/-5 nm, and the particle size is 22 microns +/-5 microns; the half-wave width of the second red fluorescent powder is 89nm +/-5 nm, and the particle size is 22 mu m +/-5 mu m.

Further, the system of the yellow-green fluorescent powder material is aluminate; the first red phosphor material system and the second red phosphor material system are silicon-based nitride.

Further, the mass percentage of the yellow-green fluorescent powder accounts for 88-97.5% of the total fluorescent powder, the mass percentage of the first red fluorescent powder accounts for 0.5-3% of the total fluorescent powder, and the mass percentage of the second red fluorescent powder accounts for 2-9% of the total fluorescent powder.

Further, the synthesis process of the second red phosphor is a direct synthesis process.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a full-spectrum LED light source which comprises an excitation source blue light chip and emission source fluorescent powder, wherein the blue light chip comprises a first LED chip, a second LED chip, a third LED chip and a fourth LED chip, and the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are sequentially connected in series; the fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. The blue light chip and the fluorescent powder are reasonably matched to effectively play a synergistic effect of the blue light chip and the fluorescent powder, so that the spectrum continuity of an LED light source is good and is closer to the solar spectrum, each parameter in R1-R15 is up to more than 90, the color rendering indexes Ra and CRI are more than 97, the conversion efficiency of the fluorescent powder is effectively improved, and the light efficiency is improved. The shortcoming of the prior art is overcome, blue light intensity is reduced to reduce blue light harm, can be applied to any place that needs the illumination, the practicality is stronger, simple structure, reasonable in design.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a 3000K full spectrum LED spectrum according to an embodiment of the present invention;

FIG. 2 is a 3500K full spectrum LED spectrum according to the embodiment of the present invention;

FIG. 3 is a 4000K full spectrum LED spectrum according to an embodiment of the present invention;

FIG. 4 is a spectrum of a 5000K full spectrum LED according to an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

A full-spectrum LED light source comprises an excitation source blue light chip and emission source fluorescent powder, wherein the blue light chip comprises a first LED chip with the dominant wavelength of 440-455 nm, a second LED chip with the dominant wavelength of 455-470 nm, a third LED chip with the dominant wavelength of 380-440 nm and a fourth LED chip with the dominant wavelength of 470-495 nm; the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are sequentially connected in series; the fluorescent powder is yellow-green fluorescent powder with peak wavelength between 510nm and 530nm, first red fluorescent powder with peak wavelength between 625nm and 640nm and second red fluorescent powder with peak wavelength between 645nm and 665 nm. The color rendering index Ra of the LED light source reaches 97, the values of R9-R15 can reach more than 90, and the full-spectrum LED light source is closer to sunlight.

The first LED chip, the second LED chip, the third LED chip and the fourth LED chip are forward chips, flip chips or vertical chips. The proportion of the first LED chips to the total number of the chips is 33.3% + -5%, the proportion of the second LED chips to the total number of the chips is 25% + -5%, the proportion of the third LED chips to the total number of the chips is 25% + -5%, and the proportion of the fourth LED chips to the total number of the chips is 16.7% + -5%. The first LED chip, the second LED chip, the third LED chip and the fourth LED chip are uniformly distributed and connected in series with each other. Specifically, the third LED chips are arranged on the outer ring, the first LED chips and the third LED chips are regularly and adjacently arranged, and the second LED chips and the third LED chips are regularly and adjacently arranged, so that the problem of light color transition can be effectively avoided.

According to the contribution of the relative distribution power of the spectrum to the color rendering index and the continuity between the spectrum of the blue light region and the blue light green light, the LED chip selects a reasonable proportion to obtain Ra and R1-R15.

The system of the yellow-green fluorescent powder material is aluminate (no division of LuAG and GaYAG). The first red phosphor material system and the second red phosphor material system are silicon-based nitride. The half-wave width of the yellow-green fluorescent powder is 100nm +/-5 nm, and the particle size is 22 mu m +/-5 mu m; the half-wave width of the first red fluorescent powder is 88nm +/-5 nm, and the particle size is 22 microns +/-5 microns; the half-wave width of the second red fluorescent powder is 89nm +/-5 nm, and the particle size is 22 mu m +/-5 mu m. The synthesis process of the second red fluorescent powder is a direct synthesis process. The principle that the half-wave width selects wider wavelength is as follows: the connecting part of the yellow-green fluorescent powder and the second red fluorescent powder is effectively prevented from being subjected to gully hooking; the principle that the peak wavelength of the first red fluorescent powder is between 625nm and 640nm is as follows: the usage amount of the second red fluorescent powder with the peak wavelength of 645nm-665nm can be reduced, so that the average wavelength is closer to 555nm which is the most sensitive to human eyes, and LER is effectively improved.

The mass percentage of the yellow-green fluorescent powder accounts for 88-97.5% of the total fluorescent powder, the mass percentage of the first red fluorescent powder accounts for 0.5-3% of the total fluorescent powder, and the mass percentage of the second red fluorescent powder accounts for 2-9% of the total fluorescent powder.

In a first embodiment, a full-spectrum LED light source (3000K) includes an excitation source blue light chip, the blue light chip includes a first LED chip with a dominant wavelength of 440nm to 455nm, a second LED chip with a dominant wavelength of 455nm to 470nm, a third LED chip with a dominant wavelength of 380nm to 440nm, and a fourth LED chip with a dominant wavelength of 470nm to 495 nm. The proportion of the first LED chips with the dominant wavelengths of 440nm to 455nm to the total number of chips is 33.3%, the proportion of the second LED chips with the dominant wavelengths of 455nm to 470nm to the total number of chips is 25%, the proportion of the third LED chips with the dominant wavelengths of 380nm to 440nm to the total number of chips is 25%, and the proportion of the fourth LED chips with the dominant wavelengths of 470nm to 495nm to the total number of chips is 16.7%.

Also comprises fluorescent powder of an emission source. The fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. Wherein the peak wavelength of the yellow-green fluorescent powder is between 518nm and 520nm, the half-wave width is between 100nm and 102nm, the particle size is between 20 mu m and 22 mu m, and the mass percentage of the yellow-green fluorescent powder accounts for 93.30 to 95.20 percent of the total mass of the fluorescent powder. The peak wavelength of the first red fluorescent powder is between 630nm and 635nm, the half-wave width is 85nm to 88nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the first red fluorescent powder accounts for 1.77 to 1.80 percent of the total mass of the fluorescent powder. The peak wavelength of the second red fluorescent powder is between 649nm and 655nm, the half-wave width is 87nm to 90nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the second red fluorescent powder accounts for 3.93 to 4.01 percent of the total mass of the fluorescent powder. The result output is shown in FIG. 1, and the first row values of Table 1.

TABLE 1 color parameter value output

CCT(K)	Duv	x	y	Rf	Rg	LER	Ra	R1	R2	R3	R4	R5	R6	R7	R8	R9	R10	R11	R12	R13	R14	R15
																							3057	0.0003	0.4334	0.4035	97	101	259	98	97	99	98	95	97	97	99	99	98	98	92	94	97	98	99
3493	-0.0002	0.4055	0.3905	97	101	264	98	97	98	99	97	97	97	100	99	99	97	94	97	97	99	98
																							3992	0.0013	0.3917	0.3803	98	101	266	98	100	98	96	97	99	98	98	98	96	96	96	96	99	98	99
4998	-0.0003	0.3451	0.351	96	102	265	98	99	98	96	97	99	97	98	98	95	95	97	94	99	98	99

In a second embodiment, a full spectrum LED light source (3500K) includes an excitation source blue light chip, the blue light chip including a first LED chip having a dominant wavelength in the range of 440nm to 455nm, a second LED chip having a dominant wavelength in the range of 455nm to 470nm, a third LED chip having a dominant wavelength in the range of 380nm to 440nm, and a fourth LED chip having a dominant wavelength in the range of 470nm to 495 nm. The proportion of the first LED chips with the dominant wavelengths of 440nm to 455nm to the total number of chips is 33.3%, the proportion of the second LED chips with the dominant wavelengths of 455nm to 470nm to the total number of chips is 25%, the proportion of the third LED chips with the dominant wavelengths of 380nm to 440nm to the total number of chips is 25%, and the proportion of the fourth LED chips with the dominant wavelengths of 470nm to 495nm to the total number of chips is 16.7%.

Also comprises fluorescent powder of an emission source. The fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. Wherein the peak wavelength of the yellow-green fluorescent powder is between 518nm and 520nm, the half-wave width is between 100nm and 102nm, the particle size is between 20 mu m and 22 mu m, and the mass percentage of the yellow-green fluorescent powder accounts for 93.69 to 95.59 percent of the total mass of the fluorescent powder. The peak wavelength of the first red fluorescent powder is between 630nm and 635nm, the half-wave width is 85nm to 88nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the first red fluorescent powder accounts for 1.56 to 1.59 percent of the total mass of the fluorescent powder. The peak wavelength of the second red fluorescent powder is between 649nm and 655nm, the half-wave width is 87nm to 90nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the second red fluorescent powder accounts for 3.75 percent to 3.82 percent of the total mass of the fluorescent powder. The result output is shown in FIG. 2, and the second row values of Table 1.

In a third embodiment, a full-spectrum LED light source (4000K) includes an excitation source blue light chip, where the blue light chip includes a first LED chip with a dominant wavelength of 440nm to 455nm, a second LED chip with a dominant wavelength of 455nm to 470nm, a third LED chip with a dominant wavelength of 380nm to 440nm, and a fourth LED chip with a dominant wavelength of 470nm to 495 nm. The proportion of the first LED chips with the dominant wavelengths of 440nm to 455nm to the total number of chips is 33.3%, the proportion of the second LED chips with the dominant wavelengths of 455nm to 470nm to the total number of chips is 25%, the proportion of the third LED chips with the dominant wavelengths of 380nm to 440nm to the total number of chips is 25%, and the proportion of the fourth LED chips with the dominant wavelengths of 470nm to 495nm to the total number of chips is 16.7%.

Also comprises fluorescent powder of an emission source. The fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. Wherein the peak wavelength of the yellow-green fluorescent powder is between 518nm and 520nm, the half-wave width is between 100nm and 102nm, the particle size is between 20 mu m and 22 mu m, and the mass percentage of the yellow-green fluorescent powder accounts for 94.13 to 96.04 percent of the total mass of the fluorescent powder. The peak wavelength of the first red fluorescent powder is between 630nm and 635nm, the half-wave width is 85nm to 88nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the first red fluorescent powder accounts for 1.62 to 1.66 percent of the total mass of the fluorescent powder. The peak wavelength of the second red fluorescent powder is between 649nm and 655nm, the half-wave width is 87nm to 90nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the second red fluorescent powder accounts for 3.25 percent to 1.62 percent of the total mass of the fluorescent powder. The result output is shown in FIG. 3, and the third row values of Table 1.

In a fourth embodiment, a full spectrum LED light source (5000K) includes an excitation source blue light chip, the blue light chip including a first LED chip having a dominant wavelength in a range from 440nm to 455nm, a second LED chip having a dominant wavelength in a range from 455nm to 470nm, a third LED chip having a dominant wavelength in a range from 380nm to 440nm, and a fourth LED chip having a dominant wavelength in a range from 470nm to 495 nm. The proportion of the first LED chips with the dominant wavelengths of 440nm to 455nm to the total number of chips is 33.3%, the proportion of the second LED chips with the dominant wavelengths of 455nm to 470nm to the total number of chips is 25%, the proportion of the third LED chips with the dominant wavelengths of 380nm to 440nm to the total number of chips is 25%, and the proportion of the fourth LED chips with the dominant wavelengths of 470nm to 495nm to the total number of chips is 16.7%.

Also comprises fluorescent powder of an emission source. The fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. Wherein the peak wavelength of the yellow-green fluorescent powder is between 518nm and 520nm, the half-wave width is between 100nm and 102nm, the particle size is between 20 mu m and 22 mu m, and the mass percentage of the yellow-green fluorescent powder accounts for 94.86 to 96.79 percent of the total mass of the fluorescent powder. The peak wavelength of the first red fluorescent powder is between 630nm and 635nm, the half-wave width is 85nm to 88nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the first red fluorescent powder accounts for 1.38 to 1.41 percent of the total mass of the fluorescent powder. The peak wavelength of the second red fluorescent powder is between 649nm and 655nm, the half-wave width is 87nm to 90nm, the particle size is 20 mu m to 22 mu m, and the mass percentage of the second red fluorescent powder accounts for 2.76 percent to 2.82 percent of the total mass of the fluorescent powder. The result output is shown in FIG. 4, and the fourth row values of Table 1.

The invention provides a full-spectrum LED light source which comprises an excitation source blue light chip and emission source fluorescent powder, wherein the blue light chip comprises a first LED chip, a second LED chip, a third LED chip and a fourth LED chip, and the first LED chip, the second LED chip, the third LED chip and the fourth LED chip are sequentially connected in series; the fluorescent powder comprises yellow-green fluorescent powder, first red fluorescent powder and second red fluorescent powder. The blue light chip and the fluorescent powder are reasonably matched to effectively play a synergistic effect of the blue light chip and the fluorescent powder, so that the spectrum continuity of an LED light source is good and is closer to the solar spectrum, each parameter in R1-R15 is up to more than 90, the color rendering indexes Ra and CRI are more than 97, the conversion efficiency of the fluorescent powder is effectively improved, and the light efficiency is improved. The shortcoming of the prior art is overcome, blue light intensity is reduced to reduce blue light harm, can be applied to any place that needs the illumination, the practicality is stronger, simple structure, reasonable in design.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.