Fluorescent ceramic for white light illumination, preparation method and white light source device

A fluorescent ceramic and white light technology, applied in the field of fluorescent ceramics, white light source devices, and preparation, can solve the problems of lack, low color rendering index, uneven light output of laser lighting, etc., so as to improve the thermal shock resistance and solve the thermal shock resistance. Weak, avoid the effect of reducing the luminous efficiency

Active Publication Date: 2020-07-21
SHANGHAI AVIATION ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] People have been expecting to solve the uneven light output and low color rendering index (about 70) of laser lighting in the prior art, especially the lack of red light components, but they have not been successful.

Method used

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  • Fluorescent ceramic for white light illumination, preparation method and white light source device
  • Fluorescent ceramic for white light illumination, preparation method and white light source device
  • Fluorescent ceramic for white light illumination, preparation method and white light source device

Examples

Experimental program
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Effect test

Embodiment 1

[0029] According to (Lu 0.79 Tb 0.2 Ce 0.01 ) 3 Al 5 o 12 Stoichiometric ratio, weigh high-purity lutetium nitrate (Lu(NO 3 ) 3 ), aluminum nitrate (Al(NO 3 ) 3 ), cerium nitrate (Ce(NO 3 ) 3 ), terbium nitrate (Tb(NO 3 ) 3 ) raw material, using urea as a complexing agent, put it into a hydrothermal reaction tank and keep it in an oven at 250°C for 48h, after washing and drying, put it in a muffle furnace and burn it at 600°C for 4h; then add magnesium oxide (MgO) and orthosilicic acid Ethyl ester (TEOS) was used as a sintering aid for ball milling, wherein the added amount of magnesium oxide (MgO) was 0.1% by mass fraction, and the added amount of tetraethyl orthosilicate (TEOS) was 0.6% by mass fraction. Put the mixed powder raw materials into a graphite mold, and put them in a plasma sintering furnace at 1700°C with a vacuum degree of 10 -3 Sintering under the condition of Pa for 30min, and finally annealing at 1450°C for 10h in a muffle furnace to obtain (Lu ...

Embodiment 2

[0031] According to (Lu 0.79 Tb 0.2 Ce 0.01 ) 3 Al 5 o 12 Stoichiometric ratio, weigh high-purity lutetium nitrate (Lu(NO 3 ) 3 ), aluminum nitrate (Al(NO 3 ) 3 ), cerium nitrate (Ce(NO 3 ) 3 ), terbium nitrate (Tb(NO 3 ) 3) raw material, using citric acid as a complexing agent, put it into a hydrothermal reaction tank and keep it in an oven at 250°C for 60h, after washing and drying, put it in a muffle furnace and burn it at 600°C for 4h; then add magnesium oxide (MgO) and orthosilicon Ethyl acetate (TEOS) was used as a sintering aid for ball milling, in which magnesium oxide (MgO) was added in an amount of 0.1% by mass fraction, and tetraethylorthosilicate (TEOS) was added in an amount of 0.6% by mass fraction. Put the mixed powder raw materials into a graphite mold, and put them in a plasma sintering furnace at 1600°C with a vacuum degree of 10 -3 Sintering under the condition of Pa for 40min, and finally annealing in a muffle furnace at 1450°C for 10h to obtai...

Embodiment 3

[0033] According to (Lu 0.79 Tb 0.2 Ce 0.01 ) 3 al 5 o 12 Stoichiometric ratio, weigh high-purity lutetium nitrate (Lu(NO 3 ) 3 ), aluminum nitrate (Al(NO 3 ) 3 ), cerium nitrate (Ce(NO 3 ) 3 ), terbium nitrate (Tb(NO 3 ) 3 ) raw material, using urea as a complexing agent, put it into a hydrothermal reaction tank and keep it in an oven at 250°C for 30h, wash and dry it with water, put it in a muffle furnace at 600°C for 4h and pre-fire it, then add magnesium oxide (MgO) and orthosilicic acid Ethyl ester (TEOS) was used as a sintering aid for ball milling, wherein the added amount of magnesium oxide (MgO) was 0.1% by mass fraction, and the added amount of tetraethyl orthosilicate (TEOS) was 0.6% by mass fraction. Put the mixed powder raw materials into a graphite mold, and put them in a plasma sintering furnace at 1500°C with a vacuum degree of 10 -3 Sintering under the condition of Pa for 50min, and finally annealing in a muffle furnace at 1450°C for 10h to obtain...

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Abstract

The invention discloses fluorescent ceramic for white light illumination, a preparation method and a white light source device. The fluorescent ceramic has a lutetium aluminum garnet fluorescent phase, and the grain size of the fluorescent ceramic is smaller than 3 microns. The expression formula of the lutetium aluminum garnet fluorescent phase is (Lu<1-x-y>REyCex)3(Al<1-z>Mnz)5O12. The white light source device comprises a blue light exciter; and the fluorescent ceramic. Beneficial effects are that (1) the granularity of raw materials and a sintering method are regulated and controlled, so that the scattering effect of fluorescent phase crystal grains on incident blue light and emitted yellow light is realized, and the problem that the luminous efficiency is reduced due to introduction of a non-fluorescent phase scattering phase is avoided; and 2) the fluorescent phase crystal grain size is small, the thermal shock resistance of the ceramic can be further improved, and the problem ofweak thermal shock resistance of the fluorescent material in the current white laser illumination is effectively solved.

Description

technical field [0001] The invention relates to the field of fluorescent materials for laser lighting and display, in particular, fluorescent ceramics for white lighting, a preparation method and a white light source device. Background technique [0002] Laser diodes have the characteristics of high photoelectric efficiency, high brightness, high collimation, long irradiation distance, and small size. Compared with LED light source products, which are only suitable for medium and low brightness fields, laser light sources can be applied to all brightness requirements, especially in the fields of high brightness, high luminous efficiency, and strong directionality. Due to the limitations of the laser’s own technology, although the laser has strong directionality, the energy density of the laser beam is unevenly distributed. Therefore, the fluorescent material for laser lighting needs to have the function of astigmatism and uniform light, which can simplify the secondary light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/626C04B35/64C09K11/77
CPCC04B35/50C04B35/622C04B35/62605C04B35/64C09K11/7774C04B2235/3217C04B2235/6567C04B2235/6581C04B2235/662C04B2235/9653Y02B20/00
Inventor 朱宁朱锦超曾庆兵王红叶勇张攀德冯少尉
Owner SHANGHAI AVIATION ELECTRIC
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