Red phosphor excitated by blue light and preparation thereof

A technology of red light fluorescence and blue light excitation, which is applied in the field of red light phosphor materials, can solve the problems of low efficiency and achieve the effects of simple and easy-to-operate production process, high light efficiency, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2011-05-25
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other materials, they can only be excited by blue light below ≤450nm, and the efficiency is not high

Method used

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  • Red phosphor excitated by blue light and preparation thereof
  • Red phosphor excitated by blue light and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 0.01mol BaCO 3 , 0.0014mol (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.000833 mol Pr 6 o 11 Grind and mix with 0.0002mol KCl in a fume hood to obtain the precursor, put the above precursor in a muffle furnace for sintering at 900°C for 2 hours, and then grind slightly to obtain the target product. The obtained product was determined by energy dispersive X-ray spectroscopy, and its composition was BaMoO 4 :(Pr, KCl) n , n=0.02, the average particle size is 1-5um. Its fluorescence spectrum and XRD pattern are as follows figure 1 and figure 2 shown.

[0022] Fluorescence spectrum detection conditions: test with Eclipse fluorescence spectrometer, its excitation wavelength: 449nm; emission wavelength: 643nm; voltage: 440V. It can be seen from the fluorescence spectrum that the phosphor has a strong absorption of visible light in the range of 430-500nm, and a strong emission at 630-650nm.

[0023] XRD pattern detection condition: use Rigaku D / max-rC type X-ray diffracto...

Embodiment 2

[0025] Weigh 0.01mol SrCO 3 , 0.0014mol (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.0002molPr(NO 3 ) 3 ·6H 2 O and 0.0002mol KCl were ground and mixed in a fume hood to obtain a precursor, and the above precursor was sintered in a muffle furnace at 1000°C for 3 hours, and then ground slightly to obtain the target product. The resulting product was determined by energy dispersive X-ray spectroscopy, and its composition was SrMoO 4 :(Pr, KCl) n , n=0.02, the average particle size is 1-5um.

Embodiment 3

[0027] Weigh 0.01mol CaO, 0.01mol Mo(NO 3 ) 3 ·5H 2 O, 0.0000333 mol Pr 6 o 11 Grinding and mixing with 0.002mol KCl in a fume hood to obtain a precursor, putting the above precursor in a muffle furnace for sintering at 800°C for 5 hours, and then grinding a little to obtain the target product. The resulting product was determined by energy dispersive X-ray spectroscopy, and its composition was CaMoO 4 :(Pr, KCl) n , n=0.02, the average particle size is 1-5um.

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Abstract

The invention relates to the field of luminescent materials, and discloses a red light phosphor excited by blue light, which has strong absorption to blue visible light between 430 and 500 nm and has strong emission between 630 and 650 nm. The constituents are expressed by the following general formulas: RMoO4: (Pr, MX)n, 0.005 is less than or equal to n and n is less than or equal to 0.05; wherein, R is an alkaline earth metal selected from calcium, magnesium, strontium or barium, M is a alkali metal selected from lithium, natrium or kalium; Y is a halogen selected from fluorine, chlorine, bromine or iodine. The preparation method is that grind and uniformly mix the precursor containing the alkaline earth metal, the precursor containing molybdenum and the precursor containing praseodymium with the alkali metal-halogen precursor, and then sintering the mixture for 1-5 hours at the temperature of 800-1000 DEG. The method has the advantages of low sintering temperature by adopting a grinding method to be combined with a gas oxidation method, simple production technology which is easy to be operated, and low cost raw materials which are easy to be obtained and applicable to industrial production. Furthermore, the light emitting efficiency of the obtained products is very high with excellent chemical and optical stability.

Description

technical field [0001] The invention relates to the field of luminescent materials, and specifically discloses a red light phosphor material excited by blue light. Background technique [0002] At present, there are not many varieties of phosphors that can be excited by blue light and emit visible light. It can be divided into seven categories: rare earth garnet, thiogallate, alkaline earth sulfide, alkaline earth metal aluminate, halophosphate, halosilicate and magnesium fluoroarsenate (germanium). Among them, sulfide has high luminous efficiency, but its performance is unstable. The escaped sulfide will poison the chip and electrodes, and the preparation of expensive gallium oxide is complicated. Eu 2+ Activated strontium aluminate, similar to commercial green long-lasting phosphors, has large particles, more than 10 μm, deliquescence, phosphor powder is alkaline, and corrodes chips and other materials. Other materials, they can only be excited by blue light below ≤450n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/85
Inventor 余锡宾杨绪勇尹开忠
Owner SHANGHAI NORMAL UNIVERSITY
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