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Garnet-structure multiphase fluorescent material and preparation method thereof

A fluorescent material, garnet technology, applied in the field of lighting units, can solve the problems of large particle size of fluorescent materials, poor luminous intensity, poor chemical stability and thermal stability, etc.

Inactive Publication Date: 2015-10-07
HANGZHOU YINGHE PHOTOELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned silicate phosphors have been widely used in recent years, the relatively poor chemical stability and thermal stability have seriously restricted the application of this material, and its luminous intensity is also poor, and the fluorescent material of the silicate system The particle size is large, and the matching with the existing phosphor is poor. The light conversion efficiency of the phosphor is low in the range of 420-470nm in the blue region of visible light, and the luminescence with strong brightness cannot be obtained. There is a big problem in practical applications. Limitations, YAG garnet structure phosphors always have irreplaceable advantages in some aspects

Method used

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  • Garnet-structure multiphase fluorescent material and preparation method thereof
  • Garnet-structure multiphase fluorescent material and preparation method thereof
  • Garnet-structure multiphase fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Y 2.95 al 5.2 o 11.4 N 0.6 :0.05Ce, 0.025F 0.15Ag

[0051] Weigh Y according to the molar ratio 2 o 3 333.07g, CeO 2 8.61g,Al 2 o 3 234.51g, AlN 24.59g, BaF 2 2.19g, mixed and ground, weighed 16.19g of Ag powder according to the molar ratio, remixed the two evenly, pre-fired the mixed raw materials at 1400-1500°C for 6 hours in an air atmosphere, and then heated them in a weak reducing atmosphere at 1500°C Sintering at lower temperature for 5 hours, the sintered body was cooled, crushed and ground to obtain the composite phosphor with garnet structure. figure 1 It is the emission spectrum of the composite phosphor obtained in Example 1, and its emission wavelength is at 550nm. Compared with the comparative example 1 of the simple phosphor with the same composition but not containing Ag particles, the luminous intensity of the composite phosphor improves about 5%.

Embodiment 2

[0054] Example 2: Y 2.95 al 4.7 Ga 0.5 o 11.4 N 0.6 :0.05Ce, 0.025F 0.15Ag

[0055] Weigh Y according to the molar ratio 2 o 3 333.07g, CeO 2 8.61g,Al 2 o 3 209.02g, AlN 24.59g, Ga 2 o 3 46.86g, BaF 2 2.19g, mixed and ground, weighed 16.19g of Ag powder according to the molar ratio, re-mixed the two evenly, and pre-fired the mixed raw materials at 1400-1500°C for 6 hours in an air atmosphere, then put them in a weak Heat preservation and sintering for 5 hours in a reducing atmosphere, and the sintered body is cooled and crushed and ground to obtain the complex-phase phosphor with the garnet structure.

Embodiment 3

[0056] Example 3: Lu 2.95 al 5.2 o 11.4 N 0.6 :0.05Ce, 0.025F 0.15Ag

[0057] Weigh Lu according to the molar ratio 2 o 3 587.05g, CeO 2 8.61g,Al 2 o 3 234.51g, AlN 24.59g, BaF 2 2.19g, mixed and ground, weighed 16.19g of Ag powder according to the molar ratio, re-mixed the two evenly, and pre-fired the mixed raw materials at 1400-1500°C for 6 hours in an air atmosphere, then put them in a weak Heat preservation and sintering for 5 hours in a reducing atmosphere, and the sintered body is cooled and crushed and ground to obtain the complex-phase phosphor with the garnet structure. figure 2 It is the excitation spectrum of the composite phosphor obtained in Example 3, image 3 It is the emission spectrum of the composite phosphor obtained in Example 3, and its emission wavelength is at 527nm.

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Abstract

The invention discloses a novel garnet-structure multiphase fluorescent material and a preparation method thereof. The novel garnet-structure multiphase fluorescent material has a chemical formula of AaM1bM2cM3dO12-delta N delta: xRe, yR. zT. The novel garnet-structure multiphase fluorescent material has a multiphase structure comprising a rare earth ion-activated garnet structure fluorescent solid solution phase and inert metal particles such as one or more of Au, Ag, Pt and Pd, and the fluorescent phase contains nitrogen replacing a part of oxygen and halogen ions replacing a part of oxygen Through low-phonon energy inert metal particles in the multiphase structure, luminescence performances of the garnet-structure fluorescent solid solution phase are obviously improved. The multiphase fluorescent material can produce a luminescence spectrum with one or more peaks after UV-blue and green light excitation, can emit lights from blue lights to orange red lights and can be used in LED device manufacture.

Description

technical field [0001] The invention relates to display devices such as cathode ray tube (CRT), plasma display panel (PDP), field effect tube (FED), electroluminescence (EL), fluorescent display tube, etc., and lighting units such as light emitting diode (LED) and fluorescent lamp. The garnet structure composite phosphor is especially suitable for fluorescent materials for LEDs, light sources and lighting units that are equipped with visible light or white light excited by ultraviolet light, blue light, blue-green light, and at least one of them emits orange-yellow and yellow light. , yellow-green, green phosphors are used for partial conversion into primary radiation. Background technique [0002] White light LEDs developed in recent years use yellow-emitting yttrium aluminum garnet (YAG:Ce) phosphors, which are mainly excited by blue light, to synthesize white light. Japanese patents JP 10 056 208, JP 10 065 221, JP 11 243 232, international PCT patents WO 9 812 757, WO 9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 邓华支波周炯
Owner HANGZHOU YINGHE PHOTOELECTRONICS MATERIALS
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