Preparation method of fluorescent ceramic containing aluminum oxide matrix and related fluorescent ceramic

A technology of fluorescent ceramics and alumina, 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, achieve high luminous efficiency, high thermal conductivity, and improve thermal conductivity. Effect

Active Publication Date: 2017-10-24
APPOTRONICS CORP LTD
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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 fluorescent ceramic containing aluminum oxide matrix and related fluorescent ceramic

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[0026] 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:

[0027] ① Mixing: Obtain the mixed powder of alumina and sintering aid, and evenly mix the mixed powder of alumina and sintering aid with phosphor powder to obtain fluorescent ceramic precursor slurry;

[0028] ② Removal of impurities: drying the fluorescent ceramic precursor slurry to remove water and organic matter to obtain fluorescent ceramic precursor powder;

[0029] ③Sintering: The fluorescent ceramic precursor powder is sintered to obtain fluorescent ceramics. The sintering temperature is 1250-1750°C, and the sintering is carried out in an oxygen-free atmosphere. The powder stays compact.

[0030]In the mixing step, the first is the selection of raw materials. In this embodiment, ultra-fine alumina powder with a small particle size is sel...

Embodiment 1

[0044] The raw material is high-purity ultra-fine alumina nanopowder with a particle size of 0.06-0.2μm, and 1wt% PEG aqueous solution is prepared, an appropriate amount of alumina nanopowder is mixed with PEG aqueous solution, and the alumina PEG aqueous solution is ultrasonically prepared for use.

[0045] Considering that magnesium oxide accounts for 0.5 wt% of the total fluorescent ceramic powder, the corresponding mass of magnesium nitrate hexahydrate is weighed to form a magnesium nitrate solution with a concentration of 0.01-1mol / L.

[0046] Mix the PEG aqueous solution of alumina and the magnesium nitrate solution to obtain a mixed suspension, which is placed on a magnetic stirrer and continuously stirred, and the temperature is set at 60°C.

[0047] Use ammonium bicarbonate as a precipitating agent to prepare an aqueous solution of about 0.1 mol / L, and slowly drop into the mixed suspension that is stirred continuously until the pH value of the mixed suspension is contr...

Embodiment 2

[0052] The raw material is high-purity ultra-fine alumina nanopowder with a particle size of 0.06-0.2μm, and 3wt% PEG aqueous solution is prepared, an appropriate amount of alumina nanopowder is mixed with PEG aqueous solution, and the alumina PEG aqueous solution is ultrasonically prepared for use.

[0053] According to the fact that yttrium oxide accounts for 3wt% of the total fluorescent ceramic powder, the corresponding mass of yttrium nitrate hexahydrate is weighed to prepare a yttrium nitrate solution with a concentration of 0.01-1mol / L.

[0054] Mix the PEG aqueous solution of alumina and the yttrium nitrate solution to obtain a mixed suspension, which is placed on a magnetic stirrer and continuously stirred, and the temperature is set at 60°C.

[0055] Use ammonia water as a precipitating agent to prepare an aqueous solution of about 0.02mol / L, and slowly drop into the mixed suspension that is stirred continuously until the pH value of the mixed suspension is controlled...

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Abstract

The invention provides a preparation method of fluorescent ceramic containing an aluminum oxide matrix. The preparation method sequentially comprises the following steps: mixing aluminum oxide, fluorescent powder and a sintering additive and removing impurities to obtain fluorescent ceramic precursor powder; then sintering the powder under an oxygen-free atmosphere to obtain the fluorescent ceramic. The grain diameter of each component is selected to be a pre-set size and the fluorescent ceramic precursor powder is subjected to high-pressure treatment in a sintering process; the sintering additive and corresponding nitrate are used as raw materials for introducing oxide. By adopting the preparation method provided by the invention, the aluminum oxide enters a liquid phase at relatively low temperature under the condition that the fluorescent powder has an unchanged crystal new look in a preparation process and the uniform and dense fluorescent ceramic with low porosity is obtained; the heat-conducting performance and luminous efficiency of the fluorescent ceramic are extremely improved.

Description

technical field [0001] The invention relates to the field of fluorescent ceramics, in particular to a method for preparing fluorescent ceramics with an alumina 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 luminous ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/64C04B35/645
CPCC04B35/10C04B35/64C04B35/645C04B2235/3206C04B2235/3222C04B2235/3224C04B2235/3225C04B2235/612
Inventor 李乾陈雨叁许颜正
Owner APPOTRONICS CORP LTD
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