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A kind of preparation method of aluminum nitride-based fluorescent ceramics and related fluorescent ceramics

A technology of fluorescent ceramics and aluminum nitride, applied in the field of fluorescent ceramics, can solve the problems of low thermal conductivity and low luminous efficiency of fluorescent ceramics, and achieve the effects of high thermal conductivity, high luminous efficiency and improved thermal conductivity.

Active Publication Date: 2021-07-23
APPOTRONICS CORP LTD
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  • Summary
  • 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:

Method used

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

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preparation example Construction

[0027] 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 includes the following steps in sequence:

[0028] ① Mixing: Mix aluminum nitride and phosphor liquid phase to obtain aluminum nitride-phosphor powder slurry, the particle size of aluminum nitride is 0.1-1 μm, and the particle size of phosphor is 10-30 μm;

[0029] ② Removal of impurities: drying the aluminum nitride-phosphor powder slurry, and then calcining it in an aerobic atmosphere to remove water and organic matter to obtain aluminum nitride-phosphor powder powder;

[0030] ③Heat treatment: Aluminum nitride-phosphor powder is heat-treated to obtain fluorescent ceramics. The aluminum nitride-phosphor powder is subjected to high-pressure treatment before and / or during heat treatment. The heat treatment temperature is 1500-1850°C. under an oxygen atmosphere.

[0031] In the mixing step...

Embodiment 1

[0046] Weigh aluminum nitride with a particle size of 0.5-1 μm, put it into a ball mill jar, add an appropriate amount of grinding solvent, thickener and ceramic dispersant, and then add grinding bodies for ball milling. When the slurry in the ball mill becomes viscous and suspended, add YAG:Ce with a particle size of 15-25 μm 3+ For the phosphor particles, continue ball milling until the phosphor powder is evenly distributed, and then end the ball milling.

[0047] Then the slurry is taken out, dried in vacuum at constant temperature to obtain dry powder, and the dry powder is calcined in a muffle furnace to remove organic components in the dry powder to obtain high-purity aluminum nitride-phosphor powder. The powder is then sieved and granulated to obtain heat-treated raw material powder.

[0048] Weigh an appropriate amount of raw material powder and put it into a graphite mold, press and form it under a pressure of 5MPa, put the aluminum nitride-phosphor powder together w...

Embodiment 2

[0050] Weigh aluminum nitride with a particle size of 0.1-0.5 μm, put it into a ball mill jar, add an appropriate amount of grinding solvent, thickener and ceramic dispersant, and then add grinding bodies for ball milling. When the slurry in the ball mill becomes viscous and suspended, add LuAG:Ce 3+ For the phosphor particles, continue ball milling until the phosphor powder is evenly distributed, and then end the ball milling.

[0051] Then the slurry is taken out, dried in vacuum at constant temperature to obtain dry powder, and the dry powder is calcined in a muffle furnace to remove organic components in the dry powder to obtain high-purity aluminum nitride-phosphor powder. The powder is then sieved and granulated to obtain heat-treated raw material powder.

[0052] Weigh an appropriate amount of raw material powder and put it into a metal mold, perform compression molding under a pressure of 40MPa, and then undergo cold isostatic pressing molding at a pressure of 200MPa,...

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Abstract

A method for preparing fluorescent ceramics based on aluminum nitride and related fluorescent ceramics. The invention protects a method for preparing fluorescent ceramics with an aluminum nitride matrix, which includes the following steps in sequence: mixing materials: mixing aluminum nitride with a particle size of 0.1 to 1 μm and fluorescent powder with a particle size of 10 to 30 μm to obtain nitrogen Aluminum nitride-phosphor powder slurry; impurity removal: drying the slurry and then calcining it to obtain aluminum nitride-phosphor powder; heat treatment: heat-treating the powder to obtain fluorescent ceramics, wherein the aluminum nitride-phosphor powder is Before and / or during the heat treatment, it is subjected to high-pressure treatment above 5MPa, the heat treatment temperature is 1500-1850°C, and it is carried out under an oxygen-free atmosphere. The preparation method enables the aluminum nitride to enter the liquid phase while the phosphor powder maintains the new crystal appearance during the preparation process, and a dense, low-porosity fluorescent ceramic is obtained, which greatly improves the thermal conductivity and luminous efficiency of the fluorescent ceramic. .

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): C04B35/581C04B35/622
CPCC04B35/581C04B35/622C04B2235/3222C04B2235/3224C04B2235/3225C04B2235/5436C04B2235/5445C04B2235/60C04B2235/656C04B2235/664C04B2235/96C04B2235/9607
Inventor 李乾许颜正
Owner APPOTRONICS CORP LTD
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