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Ce:YAG based transparent ceramic being used for fluorescence conversion of white LED and containing Sr and preparation method thereof

A transparent ceramic and fluorescent technology, applied in the field of Sr-containing Ce:YAG-based transparent ceramics and its preparation, can solve the problems of unsatisfactory service life and decreased luminous efficiency, and achieve stable color temperature, soft white light, and high light decay resistance Effect

Inactive Publication Date: 2014-12-03
盐城诚赢生物科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention proposes to introduce a small amount of Ti, Zr, V, Mn, Zn, Mg, Li and alkaline earth metal elements to replace Al in the YAG structure, introduce some F to replace O at the same time, and investigate the introduction of these ions on the yttrium aluminum garnet. The influence of lattice constant and crystal potential field, it is considered that the luminescence performance of the phosphor is the best when Ti and Mg are used to replace Al at the same time, but it does not examine the substitution on other properties of the phosphor, such as color rendering index and anti-light attenuation performance , color temperature, etc.
[0008]In a word, when the current Ce-YAG-based transparent fluorescent ceramics are directly used as encapsulation materials to replace organic polymers or silica gel, the luminous efficiency will decrease when used at high temperature for a long time Significant decline occurs, so the service life is still unsatisfactory

Method used

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  • Ce:YAG based transparent ceramic being used for fluorescence conversion of white LED and containing Sr and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Use metal aluminum and magnesium as raw materials to react with isopropanol according to the required ratio to obtain metal alkoxide, then undergo vacuum distillation, dry in an oven, and roast at high temperature for 3 hours to obtain 75g of nano-MgAl 2 o 4 Powder. Using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), strontium oxide (SrO), cerium oxide (CeO 2 ) as raw material, according to (Ce 0.001 Sr 0.001 Y 0.998 ) 3 Al 5 o 12 Prepare 25g of powder raw materials, and then use wet ball milling to grind and mix the powder raw materials with absolute ethanol as the medium until the average particle size of the powder raw materials is 0.4 microns. Then add nano MgAl2 o 4 Powder, continue to ball mill until evenly mixed. The mixed powder is dried, sieved, and pressed into tablets; then it is subjected to 200MPa cold isostatic pressing to form a green body, and put into a vacuum sintering furnace for sintering at 1700°C for 20 hours to obtain a thickness of ...

Embodiment 2

[0033] Prepare and test MgAl in the same manner as in Example 1 2 o 4 / (Ce 0.03 Sr 0.03 Y 0.94 ) 3 Al 5 o 12 Transparent fluorescent ceramic.

Embodiment 3

[0035] Prepare and test MgAl in the same manner as in Example 1 2 o 4 / (Ce 0.01 Sr 0.01 Y 0.98 ) 3 Al 5 o 12 Transparent fluorescent ceramic.

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Abstract

The invention relates to a transparent fluorescent ceramic material and in particular relates to a Ce:YAG based transparent ceramic being used for fluorescence conversion of a white laser diode (hereinafter referred to as LED) and containing Sr and a preparation method thereof. The chemical formula of the transparent ceramic is MgAl<2>O<4>-(Ce<x>Sr<y>Y<1-x-y>)<3>Al<5>O<12>. The transparent ceramic can be directly used as a packaging material to replace traditional organic polymers or silica gel packaging materials, and compared with existing transparent ceramics, has lower and stable color temperature, excellent luminous efficiency, obviously improved color rendering index and quite high stability and optical attenuation resistance; therefore the transparent ceramic has satisfactory service life.

Description

technical field [0001] The present invention relates to a transparent fluorescent ceramic material, in particular to a Ce:YAG-based transparent ceramic containing Sr for fluorescent conversion of a white light laser diode (hereinafter referred to as LED) and a preparation method thereof. The transparent ceramic is made of MgAl 2 o 4 -(Ce x Sr y Y 1-x-y ) 3 Al 5 o 12 constitute. Background technique [0002] Since its inception, white light LED has been hailed as the fourth-generation lighting source after incandescent lamps, fluorescent lamps, and gas discharge lamps because of its advantages such as high efficiency, energy saving, green environmental protection, and long life. It is widely used in mobile phones and digital cameras. , home or outdoor lighting and other fields. It is predicted that the proportion of LED lighting in the field of common lighting will reach 50% in 2015 and 80% in 2020, and become the most important lighting method in the world. The entir...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/622
Inventor 俞立军
Owner 盐城诚赢生物科技股份有限公司
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