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Making method for YAG single crystal for white light LED

A production method and single crystal technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems affecting the performance of white light LEDs, poor physical and chemical properties, poor uniformity, etc., and achieve good physical and chemical stability and excellent thermal conductivity performance, power-enhancing effect

Inactive Publication Date: 2013-02-13
XIANGLING LED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although commercial phosphors have achieved great success, they still have disadvantages such as low efficiency, poor uniformity, large light attenuation, short life, and poor physical and chemical properties, which seriously affect the performance of white light LEDs.

Method used

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  • Making method for YAG single crystal for white light LED
  • Making method for YAG single crystal for white light LED

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition of YAG single crystal is Y 2.94 Al 5 (O, F) 12 :0.06Ce, the production method is as follows: accurately weigh the raw material Y 2 O 3 66.39g, Al 2 O 3 50.98g, CeF 3 2.37g, BaF 2 3.51g, the above-mentioned raw materials are pre-processed, the sintered raw materials are put into a 60mm diameter iridium crucible, heated to 1970°C in a D400 single crystal furnace to melt, and pure YAG single crystal rods are used as seed crystals for crystal growth. The rotating speed is 12r / min, the equal-diameter drawing speed is 2.0mm / h, and crystals of a certain size are grown. Fix the grown crystal on the glass according to the required size and cut it with a carbon chip cutting machine. The wafer is soaked in acetone for grinding and polishing. The microscopic observation is free of blisters and defects, and then polishing for more than 6 hours. The chip size is a single chip with a thickness of 0.2mm and a side length of 29mm. The single chip is packaged with a shad...

Embodiment 2

[0019] The composition of YAG single crystal is Y 2.92 Al 4.8 Mg 0.1 Ti 0.1 (O, F) 12 :0.08Ce, the production method is as follows: accurately weigh the raw material Y 2 O 3 65.94g, Al 2 O 3 48.94g, CeF 3 3.15g, MgO 0.81g, TiO 2 1.60g, BaF 2 3.51g, pre-process the above raw materials, put the sintered raw materials into a 60mm diameter iridium crucible, heat it to 1970℃ in the D400 single crystal furnace to melt, and use the pure YAG single crystal rod as the seed crystal to grow the crystal. It is 12r / min, the equal-diameter pulling speed is 2.0mm / h, and crystals of a certain size are grown. Grind and polish the wafer, observe microscopically without blisters and defects, and polish for more than 6 hours. Polish the single crystal into a single wafer with a thickness of 0.5mm and a side length of 53mm. Use a shadowless adhesive for the single wafer Packaged on 50 3W integrated LED chips with a rated power of 150W (the light-emitting area of ​​the integrated 50 chips is 50m...

Embodiment 3

[0021] The composition of YAG single crystal is Y 2.82 Gd 0.1 Al 4.8 Mg 0.1 Ti 0.1 (O, F) 12 :0.08Ce, the production method is as follows: accurately weigh the raw material Y 2 O 3 63.68g, Gd 2 O 3 3.63g, Al 2 O 3 48.94g, CeF 3 3.15g, MgO 0.81g, TiO 2 1.60g, BaF 2 3.51g, pre-process the above raw materials, put the sintered raw materials into a 60mm diameter iridium crucible, heat it to 1970℃ in the D400 single crystal furnace to melt, and use the pure YAG single crystal rod as the seed crystal to grow the crystal. It is 11r / min, the equal-diameter pulling speed is 2.2mm / h, and crystals of a certain size are grown. The single crystal is polished and processed into a single chip with a thickness of 0.8mm and a side length of 55mm. The single chip is packaged with a shadowless adhesive on 50 3W integrated LED chips, with a rated power of 150W (the light-emitting area of ​​the integrated 50 chips is 50mm*50mm) is packaged on the device to complete the LED, the adjustment curr...

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Abstract

The present invention relates to a making method for a YAG single crystal for a white light LED. The YAG single crystal has a chemical general formula of (A3-x)(Al5-2mBmCm)FnO12-n:xCe, wherein A is one or a plurality of materials selected from Y, Gd, La and Tb, B is one or a plurality of materials selected from Ti, Zr and V, C is one or two materials selected from Mn, Zn, Mg and Li, x is more than or equal to 0.03 and is less than or equal to 0.1, m is more than or equal to 0.01 and is less than or equal to 2, and n is more than or equal to 0 and is less than or equal to 3x. According to the making method, matched raw materials are pretreated, and then heated to a temperature of 1970 DEG C in an iridium crucible to obtain a melt; a pure YAG crystal is adopted as a seed crystal, and crystal growth is performed in a single crystal furnace to obtain complete single crystals with characteristics of various concentrations and no obvious flaw; a carbon sheet cutting machine is adopted to adhere the crystals to organic glass to cut into crystal sheets having the desired thickness of approximate 0.2-5 mm; soaking is performed for 12 hours by using acetone; burnishing is performed through coarse sand and fine sand; a polishing machine is adopted to carry out polishing on both surfaces of the crystal for more than 6 hours; no blister and defect exists through microscopic detection; and the processed crystal sheets having different concentrations and thicknesses are encapsulated on a LED light emitting diode by using a high temperature resistance colloidal, wherein the crystal has good thermal conductivity and physical and chemical stability so as to effectively improve luminous efficiency of the LED and prolong a service life of the LED.

Description

Technical field [0001] The present invention relates to a method for making YAG single crystals for white light LEDs-RE, Ce: YAG (RE=La, Tb, Gd) single crystals are used in LED design methods. The present invention is designed to grow, process and use single crystals in LEDs The packaging process. Background technique [0002] White LED has the advantages of solidification, small size, low heat generation, low power consumption, long life, fast response speed and environmental protection, and is widely used in general lighting and backlighting. At present, commercial white LEDs are mainly composed of a combination of a blue chip and a yellow phosphor. The blue light emitted by the blue chip and the yellow light emitted by the phosphor are excited by the blue light to generate light. According to the principle of complementary color, the visible white light is obtained by adding and mixing blue light and yellow light. Although commercial phosphors have achieved great success, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B15/00H01L33/50C09K11/86
CPCY02B20/181Y02B20/00
Inventor 李杨邓顺明张红徐颖
Owner XIANGLING LED
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