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A kind of garnet-based red fluorescent ceramic material and preparation method thereof

A technology of red fluorescence and garnet, applied in the field of garnet-based red fluorescent ceramic materials and their preparation, can solve the problems of high cost, harsh preparation conditions of fluorescent ceramics, etc. Effect

Active Publication Date: 2021-03-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very few reports on red fluorescent ceramics, and the published ones are mainly non-oxide systems such as nitrides, but the preparation conditions of these fluorescent ceramics are harsh and the cost is high

Method used

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  • A kind of garnet-based red fluorescent ceramic material and preparation method thereof
  • A kind of garnet-based red fluorescent ceramic material and preparation method thereof
  • A kind of garnet-based red fluorescent ceramic material and preparation method thereof

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preparation example Construction

[0037] As an example of the preparation method of the garnet-based red fluorescent ceramics, it includes as follows:

[0038] (1) According to RE 3 Al 5-x-y mn x Mg y o 12 (0.001≤x≤0.01, 0≤y≤0.1) stoichiometric ratio weighs RE 2 o 3 Powder, Al 2 o 3 Powder, MgO powder, and Mn source powder are mixed, ground, and sieved. MgO powder is used as a sintering aid and Mg as valence compensation is also provided. 2+ ; (2) dry pressing the mixed material and performing cold isostatic pressing; (3) sintering the biscuit at high temperature in a muffle furnace to obtain red fluorescent ceramics. RE in step (1) 2 o 3 Powder is Y 2 o 3 、Lu 2 o 3 , La 2 o 3 , Ga 2 o 3 At least one of the Mn source powder is MnO, MnCO 3 , Mn 2 o 3 One of. The purity of all raw material powders is not less than 99.5%. The high-temperature solid-state reaction in step (3) needs to be carried out in an oxidizing atmosphere, preferably directly sintered in an air atmosphere, the sintering ...

Embodiment 1

[0043] Fixed Mg content, chemical formula is Lu 3 Al 5-x-0.04 mn x Mg 0.04 o 12 , where x=0.001. The sintering temperature is 1600° C., the time is 5 hours, and the atmosphere is air atmosphere. The obtained ceramic body has a relative density of 97.85%, and emits red light when excited by ultraviolet or blue light.

Embodiment 2

[0045] Fixed Mg content, chemical formula is Lu 3 Al 5-x-0.04 mn x Mg 0.04 o 12 , where x=0.002. The sintering temperature is 1600° C., the time is 5 hours, and the atmosphere is air atmosphere. The obtained ceramic body has a relative density of 97.88%, and emits red light when excited by ultraviolet or blue light.

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Abstract

The invention provides a garnet-based red fluorescent ceramic material and a preparation method thereof. A chemical formula of the garnet-based red fluorescent ceramics is as follows: RE3Al5-x-yMnxRyO12, wherein RE is at least one of Y, Lu, La and Ga, R is one of Mg, Ca, K and Li, x is greater than or equal to 0.001 and less than or equal to 0.05, y is greater than or equal to 0 and less than or equal to 0.1, and x is a doping molar fraction of luminescent ions Mn<4+>.

Description

technical field [0001] The invention relates to a garnet-based red fluorescent ceramic material and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] High-power WLEDs and laser lighting technology have the advantages of high efficiency, high brightness, long life, low energy consumption, and environmental protection, and are currently research hotspots in the field of solid-state lighting displays. Commercial WLEDs are obtained by combining blue LED chips and YAG:Ce yellow phosphor powder. The preparation technology is mature and the cost is relatively low. However, the phosphor powder needs to be encapsulated in resin, and the resin is easy to age and has low thermal conductivity, which seriously affects long-term use. Therefore, ceramic phosphors with high thermal conductivity and no need for packaging have emerged. At present, the mainstream Y / LuAG: Ce yellow / green fluorescent ceramics have achieved some...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/622C09K11/80
CPCC04B35/44C04B35/622C04B2235/3201C04B2235/3203C04B2235/3206C04B2235/3208C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3262C04B2235/3265C04B2235/656C04B2235/6583C04B2235/764C04B2235/96C09K11/7706
Inventor 张芸莉胡松王正娟周国红王士维
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI