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A preparation method of fluorescent ceramics based on aluminum nitride and related fluorescent ceramics

A technology of fluorescent ceramics and aluminum nitride, which is applied in the preparation of fluorescent ceramics and related fluorescent ceramics, can solve the problems of low luminous efficiency and low thermal conductivity of fluorescent ceramics, and achieve high luminous efficiency, high thermal conductivity, and good bending resistance The effect of intensity

Active Publication Date: 2020-10-20
APPOTRONICS CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of low thermal conductivity and low luminous efficiency of the prepared fluorescent ceramics in the above-mentioned prior art, the present invention provides a method for preparing fluorescent ceramics with high thermal conductivity and high luminous efficiency, which includes the following steps in sequence:

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  • A preparation method of fluorescent ceramics based on aluminum nitride and related fluorescent ceramics

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preparation example Construction

[0025] like figure 1 It is a flowchart of a method for preparing fluorescent ceramics according to an embodiment of the present invention. As shown in the figure, the preparation method includes the following steps in sequence:

[0026] ① Mixing: Mix aluminum nitride powder, first phosphor, second phosphor and solvent to obtain aluminum nitride-phosphor powder slurry. The particle size of aluminum nitride is 0.1-1 μm, and the particle size of the first phosphor is The diameter is 15-30 μm, and the particle diameter of the second phosphor is 2-5 μm;

[0027] ② Removal of impurities: drying the aluminum nitride-phosphor powder slurry, and then calcining it in an aerobic atmosphere to obtain aluminum nitride-phosphor powder;

[0028] ③Heat treatment: Aluminum nitride-phosphor powder is heat-treated to obtain fluorescent ceramics, wherein the aluminum nitride-phosphor powder is subjected to high-pressure treatment above 5MPa before and / or during heat treatment, and the heat trea...

Embodiment 1

[0045] Weigh aluminum nitride with a particle size of 0.5-1 μm and put it into a ball mill jar, add an appropriate amount of grinding solvent (ethanol), thickener and ceramic dispersant, then add grinding bodies, and perform ball milling for 2 hours. When the slurry in the ball mill becomes viscous and suspended, add YAG:Ce with a particle size of 2-5 μm 3+ For phosphor particles, continue ball milling for 1 hour; then add YAG:Ce with a particle size of 15-20 μm 3+ For the phosphor particles, continue ball milling for 0.5h until the phosphor powder is evenly distributed, and then end the ball milling.

[0046] Then the slurry is taken out, dried in vacuum at constant temperature to obtain a dry powder, and the dry powder is calcined in a muffle furnace to remove organic components in the dry powder, and then the powder is sieved and granulated to obtain a heat-treated raw material powder.

[0047] Weigh an appropriate amount of raw material powder and put it into a graphite m...

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Abstract

The invention protects a preparation method of aluminum nitride metrical fluorescent ceramic, which orderly includes steps of mixing materials: evenly mixing aluminum nitride with grain diameter of 0.1-1 mu m, the first fluorescent powder with grain diameter of 15-30 mu m, the second fluorescent powder with grain diameter of 2-5 mu m and solvent to obtain aluminum nitride-fluorescent powder slurry, wherein the first fluorescent powder has the same material as the second fluorescent powder; decontaminating: drying the slurry and then calcining to obtain aluminum nitride-sintering aids-fluorescent powder; thermal treatment: performing powder thermal treatment to obtain fluorescent ceramic, wherein the aluminum nitride-sintering aids-fluorescent powder is performed with over 5MPa high pressure treatment before thermal treatment and / or in the thermal treatment; the thermal treatment temperature is 1500-1850 DEG C, and the thermal treatment is carried out under an anaerobic atmosphere. During the thermal treatment, the second fluorescent powder with small grain diameter fills the gap at surrounding of the first fluorescent powder with big grain diameter, the lighting density of the fluorescent ceramic is improved, and thus the sintered fluorescent ceramic has good lighting efficiency.

Description

technical field [0001] The invention relates to the field of fluorescent ceramics, in particular to a method for preparing fluorescent ceramics with an aluminum nitride matrix and related fluorescent ceramics. Background technique [0002] With the development of laser display technology, the technology of blue laser excitation of fluorescent materials to obtain visible light has been continuously paid attention to. The current research direction is mainly to develop new fluorescent materials (wavelength conversion materials) based on the characteristics of laser excitation phosphor powder. The main The requirements are high luminous brightness, ability to withstand high-power laser irradiation, high optical conversion efficiency, and high thermal conductivity. [0003] Traditional fluorescent ceramics are mainly developed for the luminous characteristics of LEDs. Due to the low power of LED chips and the low power density of blue light emitted, the luminous efficiency of lu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/581C04B35/622C04B35/626C04B35/64
CPCC04B35/581C04B35/622C04B35/62605C04B35/64C04B2235/602C04B2235/9607C04B2235/9646
Inventor 李乾许颜正
Owner APPOTRONICS CORP LTD