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Preparation method of aluminum nitride metrical fluorescent ceramic and related fluorescent ceramic

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: 2017-09-26
APPOTRONICS CORP LTD
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  • Abstract
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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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  • Preparation method of aluminum nitride metrical fluorescent ceramic and related fluorescent ceramic

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preparation example Construction

[0025] Such as 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 sequentially includes the following steps:

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

[0027] ② Impurity removal: drying the aluminum nitride-phosphor slurry, and then calcining it in an oxygen atmosphere to obtain aluminum nitride-phosphor powder;

[0028] ③ Heat treatment: heat treatment of aluminum nitride-phosphor powder powder to obtain fluorescent ceramics, wherein the aluminum nitride-phosphor powder powder undergoes a high pressure treatment of more than 5MPa before and / or during the heat treat...

Embodiment 1

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

[0046] Then the slurry is taken out and dried under vacuum at a constant temperature to obtain dry powder. 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 heat-treated raw material powder.

[0047] Weigh an appropriate amount of raw material powder into a graphite mold, press molding und...

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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 preparation method of aluminum nitride matrix fluorescent ceramics and related fluorescent ceramics. Background technique [0002] The technology of blue laser to excite fluorescent materials to obtain visible light. With the development of laser display technology, the current research direction is mainly to develop new types of fluorescent materials (wavelength conversion materials) according to the characteristics of laser excited phosphors. 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 light-emitting characteristics of LEDs. Due to the low power of LED chips and low blue power density, the luminous efficiency of light-emitting ceramics developed for LEDs has not been paid enough attention. ...

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Application Information

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Patent Type & Authority Applications(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