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High-color-rendering-index high-thermal-conductivity fluorescent film, preparation method and application in display equipment

A technology with high CRI and high thermal conductivity, applied in semiconductor lasers, lasers, semiconductor devices, etc., can solve problems such as low color rendering index, difficulty in adjusting the size and shape of thin film materials, and low thermal conductivity

Active Publication Date: 2021-02-26
湖州市汉新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) At present, the existing thin-film materials used for laser lighting have low thermal conductivity and cannot withstand the irradiation of high-power LEDs or lasers, or the low-power lasers are irradiated for a long time, and they are prone to failure
[0006] (2) At present, the existing thin film materials are all coated with phosphors with low CRI, and the final formed laser lighting device or equipment has a low color rendering index, which cannot meet the needs of photographic lighting, etc.
[0007] (3) The size and shape of the existing thin film materials are not easy to adjust, and cannot be processed and packaged according to the existing laser lighting equipment
[0008] The difficulty in solving the above problems and defects is: the thermal conductivity of the light-emitting materials currently used in high-power high-resolution LEDs or thin-film materials for laser displays is low, and it is difficult to conduct away the heat generated by laser chips. Therefore, it is necessary to develop a Luminescent materials with high CRI and high thermal conductivity, or composite structures with high CRI and high thermal conductivity
In addition, currently commonly used YAG:Ce phosphors mainly focus on the yellow-green light band, lacking red and other color bands, so there will be a disadvantage of low color rendering index in high-power high-resolution LED or laser display devices
The shape and size of the existing thin film materials for lighting are based on conventional LED lighting chips and equipment, rather than being satisfied with high-power high-resolution LED or laser display chips and equipment

Method used

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  • High-color-rendering-index high-thermal-conductivity fluorescent film, preparation method and application in display equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Application of high CRI and high thermal conductivity fluorescent film in laser display light source module (transmissive type);

[0043] (1) Mix YAG:Ce fluorescent powder with an emission wavelength of 565nm and silica gel, resin, and silicone resin composite glue in a mass ratio of 4:1 to prepare a mixed slurry;

[0044] (2) Using the screen printing process, the thickness of the screen is 0.06mm, and the above mixed slurry is brushed on the sapphire substrate coated with a yellow-green light reflection and blue light transmission film, and then dried at 300 ° C for 30 minutes;

[0045] (3) Carry out cross-sectional SEM test to fluorescent film, its result is as follows Figure 5 shown;

[0046] (4) The thermal conductivity test of the high thermal conductivity fluorescent film shows that its thermal conductivity is 29W / (m.k)@25℃;

[0047] (5) Encapsulate the prepared high CRI and high thermal conductivity fluorescent film with a 455nm blue laser diode in a transpar...

Embodiment 2

[0050] Application of high CRI and high thermal conductivity fluorescent film in green light source modules for laser display and LED display (transmissive type);

[0051] (1) GaYAG aluminate green fluorescent powder with an emission wavelength of 545nm is mixed with silica gel, resin, and silicone resin composite glue in a mass ratio of 4:1 to prepare a mixed slurry;

[0052] (2) Using the screen printing process, the thickness of the screen is 0.06mm, and the above mixed slurry is brushed on the sapphire substrate coated with a yellow-green light reflection and blue light transmission film, and then dried at 300 ° C for 30 minutes;

[0053] (3) Encapsulate the prepared high CRI and high thermal conductivity fluorescent film with the 455nm blue laser diode and the 460nm blue LED chip respectively in a transparent encapsulation mode;

[0054] (4) Spectrum tests are carried out on the packaged laser display and LED display light source modules, and the results are as follows ...

Embodiment 3

[0057] Application of high CRI and high thermal conductivity fluorescent film in red light source of laser display light source module (transmissive type);

[0058] (1) Mix the nitride red fluorescent powder with an emission wavelength of 630nm and silica gel, resin, and silicone resin composite glue in a mass ratio of 4:1 to prepare a mixed slurry;

[0059] (2) Using the screen printing process, the thickness of the screen is 0.06mm, and the above mixed slurry is brushed on the sapphire substrate coated with a yellow-green light reflection and blue light transmission film, and then dried at 300 ° C for 30 minutes;

[0060] (3) Encapsulate the prepared high CRI and high thermal conductivity fluorescent film with the 455nm blue laser diode and the 460nm blue LED chip respectively in a transparent encapsulation mode;

[0061] (4) Spectrum tests are carried out on the packaged laser display and LED display light source modules, and the results are as follows Figure 8 shown in a...

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Abstract

The invention belongs to the technical field of inorganic luminescent materials, and discloses a high-color-rendering-index high-thermal-conductivity fluorescent thin film, a preparation method and application of the high-color-rendering-index high-thermal-conductivity fluorescent thin film in display equipment. The high-color-rendering-index high-thermal-conductivity fluorescent thin film takes sapphire plated with a yellow-green light reflection and blue light transmission film as a substrate; silica gel, resin or silicon resin compounded YAG: Ce, cyan light, green light and red light fluorescent powder are disposed on the substrate in a coating manner, wherein YAG: Ce is aluminate; the blue-light fluorescent powder is nitrogen oxide; the green fluorescent powder is GaYAG aluminate or LuAG aluminate; and the red-light fluorescent powder is nitride. The preparation method comprises the steps of silk-screen printing, a tape casting method and a spraying method. According to the invention, the thermal conductivity is 20-35Wm<-1>K<-1>, the broadband emission and excitation source is a laser diode or an LED chip of blue light or ultraviolet light, the emission wavelength is adjustable(480-750nm), the color rendering index is 78-95, and the lumen efficiency is grater than 50lm / W.

Description

technical field [0001] The invention belongs to the technical field of inorganic luminescent materials, and in particular relates to a fluorescent film with high CRI and high thermal conductivity, a preparation method and an application in a display device. Background technique [0002] Laser projectors and laser TVs using laser display technology are currently hot research objects in the display field. Compared with traditional LCD and other display technologies, it has the characteristics of large color gamut, rich colors, high color saturation, long life, and low energy consumption. At present, the main use in this field is Ce, which can convert blue light into yellow-green light. 3+ Ion doping Y 3 al 5 o 12 (referred to as YAG:Ce) yttrium aluminum garnet fluorescent glass as a light source for green light and red light, that is, laser phosphor display technology (ALPD). However, due to the low thermal conductivity of fluorescent glass, it cannot withstand high-power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50H01S5/00H01S5/028G09F9/30G09F9/33
CPCH01L33/504H01S5/0085H01S5/028G09F9/33G09F9/30H01L2933/0041
Inventor 袁瑞张志军赵景泰
Owner 湖州市汉新科技有限公司
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