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Gradient-concentration-change fluorescent ceramic for laser illumination, and preparation method thereof

A fluorescent ceramic, concentration gradient technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of sample cracking and sample fluorescence efficiency reduction, and achieve high yield, solve the problem of sample explosion, and poor thermal stability.

Inactive Publication Date: 2020-06-16
SHANGHAI AVIATION ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite fluorescent ceramic is prepared by standard powder, and the concentration gradient is designed according to the requirements of the specific laser lighting system and the characteristics of the excitation light source. 3+ Diffusion of ions, so that the concentration of activated ions in the material is basically linearly increasing, and the energy of the excitation light source in the material can be absorbed uniformly, and the problem of low fluorescence efficiency and cracking of the sample caused by the high temperature of the excitation end surface of the material can be solved. At the same time, the white light color rendering index can be realized. promote

Method used

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  • Gradient-concentration-change fluorescent ceramic for laser illumination, and preparation method thereof
  • Gradient-concentration-change fluorescent ceramic for laser illumination, and preparation method thereof
  • Gradient-concentration-change fluorescent ceramic for laser illumination, and preparation method thereof

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Embodiment 1

[0021] According to the required material properties, design a suitable concentration distribution, select the maximum active ion doping concentration y=2at.%, and the preparation method is as follows:

[0022] 1. Preparation of different Ce 3+ Ion molar concentration Ce: YAG series standard ceramic powder, Ce 3+ The range of ion molar concentration y is: 0≤y≤2at.%. Standard ceramic powder is Ce 3+ 11 types of Ce:YAG powders with ion molar concentration gradient tolerance of 0.2at.%, minimum concentration of 0, and maximum concentration of 2at.%.

[0023] 2. Select a mold with a suitable size according to the size of the fluorescent ceramics to be prepared, select the maximum concentration according to the requirements of the specific lighting system for the material, pour the prepared YAG ceramic powder into the mold, perform 1MPa dry pressing for 30 seconds, and then sequentially Pour the powder into the mold in the order of increasing Ce ion concentration and perform dry...

Embodiment 2

[0027] According to the required material properties, design a suitable concentration distribution, select the maximum active ion doping concentration y=1.8at.%, and the preparation method is as follows:

[0028] 1. Select a mold with a suitable size according to the size of the fluorescent ceramics to be prepared, select the maximum concentration according to the requirements of the specific lighting system for the material, pour the prepared YAG ceramic powder into the mold, perform 1MPa dry pressing for 30 seconds, and then sequentially Pour the powder into the mold in the order of increasing Ce ion concentration and carry out dry pressing for 30 seconds until the dry pressing of the powder with the maximum concentration y=1.8at.% is selected, and the green body is kept at 5MPa for 1 minute and then cooled and isostatic Press 210MPa for two minutes to form the green body;

[0029] 2. Put the green body into the vacuum sintering furnace and vacuumize to 10 -3 Pa for heating...

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Abstract

The invention discloses a gradient-concentration-change fluorescent ceramic for laser illumination, and a preparation method thereof, wherein the fluorescent ceramic uses a YAG ceramic as a matrix material, uses Ce<3+> ions as light-emitting ions, and has a molecular formula of Cex:Y3-xAl5O12, x is larger than or equal to 0 and smaller than or equal to 0.06, and the fluorescent ceramic is distributed in the excitation incident direction of a laser light source in the mode that the concentration is gradually increased. According to the invention, laser energy can be uniformly absorbed and excited, so that the temperature of the material is uniform, the problems of fluorescence conversion efficiency reduction and sample explosion caused by temperature difference of the material are solved, the fluorescence spectrum is widened by utilizing the gradient concentration change, and the color rendering index of the fluorescent ceramic is improved.

Description

technical field [0001] The invention relates to the field of fluorescent materials for laser lighting, in particular, density gradient fluorescent ceramics for laser lighting and a preparation method thereof. Background technique [0002] Ce:YAG phosphor is a very important fluorescent material. However, for high-power laser lighting, the phosphor has been unable to meet the demand, and the glass-ceramic materials that have recently emerged on the market are made of glass, and the refractive index difference between the phosphor particles and the glass is relatively large. Large, resulting in too much scattering of the material, part of the energy of the excitation light source is dissipated in the matrix glass in the form of heat, and the thermal conductivity of the glass matrix is ​​low, resulting in an increase in the temperature of the luminescent material and a decrease in luminous efficiency; at the same time, because the glass is a metastable structure , so it is easy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C09K11/80C04B35/622C04B35/64
CPCC04B35/44C09K11/7774C04B35/622C04B35/64C04B2235/3229C04B2235/3225C04B2235/6567C04B2235/656C04B2235/6581C04B2235/662
Inventor 张攀德王红冯少尉叶勇李东升朱宁李春晖朱锦超
Owner SHANGHAI AVIATION ELECTRIC
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