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Lu-containing CE:YAG-based transparent ceramics for white LED fluorescence conversion and preparation method thereof

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

Inactive Publication Date: 2016-02-10
盐城诚赢生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For example, although CN102832328A discloses a fluorescent ceramic composed of polycrystalline Re:YAG, wherein the rare earth element Re is selected from Ce, Eu, Er, Nd, Tb, Sm, Tm, Dy or Yb, and the doping amount is 0.005 to 10wt%. , but it only examines the light effect of the fluorescent ceramic light source and its influence on the color temperature after the light source is turned on for 30 minutes
[0008] However, when the current Ce-YAG-based transparent fluorescent ceramics are directly used as packaging materials to replace organic polymers or silica gel, the luminous efficiency will decrease significantly when used at high temperature for a long time, so the service life is still not satisfactory.

Method used

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  • Lu-containing CE:YAG-based transparent ceramics for white LED fluorescence conversion and preparation method thereof

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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 ), lutetium oxide (Lu 2 o 3 ),, cerium oxide (CeO 2 ) as raw material, according to (Ce 0.001 Lu 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 MgAl 2 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 thi...

Embodiment 2

[0033] Prepare and test MgAl in the same manner as in Example 1 2 o 4 / (Ce 0.03 Lu 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 Lu 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 Lu and a preparation method thereof. The chemical formula of the transparent ceramic is MgAl<2>O<4>-(Ce<x>Lu<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 Lu-containing Ce: YAG-based transparent ceramic used 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 Lu 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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