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Ceramic material, preparation method thereof and fluorescent ceramic device

A technology of ceramic materials and raw materials, applied in the field of multifunctional materials, can solve problems affecting projector life and color performance, and achieve the effects of avoiding thermal recession, improving system output brightness, good thermal conductivity and thermal stability

Active Publication Date: 2017-10-27
SHENZHEN EVIEWTEK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the lifespan of the color wheel phosphor is only a few thousand hours, which seriously affects the lifespan and color performance of the projector.

Method used

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  • Ceramic material, preparation method thereof and fluorescent ceramic device

Examples

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preparation example Construction

[0037] The present invention provides a method for preparing the ceramic material described in the above technical solution, which includes the following steps:

[0038] (1) Put Y 2 O 3 , Al 2 O 3 , CeO 2 Mixing with M oxide to prepare a powder raw material; the powder raw material preferably also contains R oxide;

[0039] (2) Pressing the powder raw material into a shape to obtain a green body;

[0040] (3) Sintering the green body to obtain a ceramic material.

[0041] In the present invention, the oxide of R and the oxide of M are the same as the oxide of R and M described in the above technical solution, and will not be repeated here. The present invention provides for the Y 2 O 3 , Al 2 O 3 , CeO 2 The source of the oxide of R and the oxide of M is not particularly limited, and can be purchased commercially, and the purity of each oxide is preferably not less than 99.9%. In the present invention, the Y 2 O 3 , Al 2 O 3 , CeO 2 The dosage ratio of the oxide of R and the oxide of...

Embodiment 1

[0069] Weigh the required high purity Y according to the molar ratio 2.998:4.95:0.002:0.001:0.1 2 O 3 , Al 2 O 3 , CeO 2 , La 2 O 3 And SiO 2 , Its purity is not less than 99.9%, and then use absolute ethanol as the ball milling medium, high-purity alumina ball as the grinding ball, tetraethylorthosilicate as the sintering aid, polyethylene glycol 400 as the dispersing agent, in the planetary type High-speed ball milling in the ball mill. After ball milling, it is dried, ground, and sieved to obtain sub-micron high-purity powder. The powder is calcined at 750°C for 1 hour to remove residual organic matter. After calcination, it is sieved again to obtain sub-micron high-purity ultrafine powder. raw material.

[0070] Uniaxial compression molding of the obtained ultrafine powder raw material, and then use 250MPa cold isostatic pressing to obtain a green sheet with certain strength;

[0071] Put the obtained green sheet into an atmosphere furnace for sintering at 1600°C for 10 hours,...

Embodiment 2

[0077] The ceramic material is prepared according to the method described in Example 1. The difference from Example 1 is that the molar ratio of 2.98:4:0.02:0.01:1.0 is required to weigh the high purity Y 2 O 3 , Al 2 O 3 , CeO 2 , Sm 2 O 3 And Ga 2 O 3 , Get (Y 2.98 Ce 0.01 Sm 0.01 )(Al 4.0 Ga 1.0 )O 12 Ceramic material.

[0078] The ceramic material prepared in Example 2 of the present invention was tested according to the detection method of Example 1. The test result is that the ceramic material prepared in Example 2 of the present invention has a transmittance of 75% through wavelengths above 500 nm and is transparent. Ceramic, the thermal conductivity is 8.7W / m·K, the luminous intensities at 25℃, 50℃, 100℃, 150℃ and 200℃ are 1, 0.99, 0.956, 0.932, 0.907, and the thermal stability is good. It can emit green light with a peak position of 517nm under the excitation of, and the fluorescence conversion rate is high.

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Abstract

The invention provides a ceramic material. The ceramic material is prepared from raw materials comprising Y2O3, Al2O3, CeO2 and oxides of M, wherein the M is one or more selected from Si, Ge, Ga, Sc and V. The ceramic material provided by the invention can generate green light, of which the peak wavelength is not greater than 525nm and the light-emitting peak half-beam altitude is not greater than 70nm, under the excitation of blue laser; the transparency of the ceramic material can be regulated through porosity; the ceramic material has good heat conductivity and thermal stability; by preparing a fluorescent ceramic device from the ceramic material, the fluorescent ceramic device can be applied to a projection system instead of fluorescent powder, and heat fade of luminescence brightness caused by adopting the fluorescent powder is effectively avoided, so that the projection system can have good color performance, ultralong life and good stability, and the system output brightness is improved to the maximum.

Description

Technical field [0001] The invention relates to the technical field of multifunctional materials, in particular to a ceramic material and a preparation method thereof and a fluorescent ceramic device. Background technique [0002] Most of the current miniature projections use LEDs as the lighting source. LED has the advantages of small size, long life, fast response, energy saving and environmental protection. However, in micro-projection applications, there are still LEDs with low luminous flux, and the luminous flux per unit optical expansion is lower than that of traditional projection light sources, and the heat generation is too large. problem. In order to improve the luminous efficiency of LEDs, phosphor technology can be used to prepare LEDs of other wavelengths by taking advantage of the high luminous efficiency of certain wavelength LEDs to improve the luminous efficiency of this wavelength band. However, there are also unfavorable factors such as excessively wide spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622C09K11/80C09K11/82
CPCC04B35/44C04B35/622C04B2235/3224C04B2235/3227C04B2235/3229C04B2235/3286C04B2235/3287C04B2235/3418C04B2235/9653C09K11/7774C09K11/7776
Inventor 贺银波滕浩林辉
Owner SHENZHEN EVIEWTEK TECH CO LTD
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