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Phosphate yellow fluorescent powder excited by blue light and preparation method thereof

A technology of blue light excitation and phosphor powder, applied in the field of phosphor powder, to achieve the effects of uniform particle size, good chemical and thermal stability, and high luminous intensity

Active Publication Date: 2014-02-26
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphate blue, green, and red phosphors have been reported, but phosphate yellow phosphors, especially yellow phosphors suitable for blue light chip excitation, have not been reported yet.

Method used

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  • Phosphate yellow fluorescent powder excited by blue light and preparation method thereof
  • Phosphate yellow fluorescent powder excited by blue light and preparation method thereof
  • Phosphate yellow fluorescent powder excited by blue light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of phosphate yellow fluorescent powder excited by blue light, the chemical expression of this fluorescent powder is (Ca 3.9 Ba 0.05 )(PO 4 ) 2 O:0.05Eu 2+ , its preparation method comprises the steps: according to (Ca 3.9 Ba 0.05 )(PO 4 ) 2 O:0.05Eu 2+ Weigh calcium hydrogen phosphate CaHPO 4 , calcium carbonate CaCO 3 , barium carbonate BaCO 3 and europium oxide Eu 2 o 3 , the molar ratio between them is 2: 1.9: 0.05: 0.025, and the mixture is obtained after grinding and mixing; 2 +95%N 2 (Volume ratio) in a nitrogen-hydrogen mixed atmosphere and baked at 1450° C. for 3 hours, and then cooled to room temperature to obtain a yellow phosphor suitable for blue light excitation. Such as figure 1 As shown, the excitation spectrum of the phosphor powder of the present invention is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 465nm, which coincides well with the emission peak of the ga...

Embodiment 2

[0030] A kind of phosphate yellow fluorescent powder excited by blue light, the chemical expression of this fluorescent powder is (Ca 3.89 Ba 0.01 )(PO 4 ) 2 O:0.1Eu 2+ , its preparation method comprises the steps: according to (Ca 3.89 Ba 0.01 )(PO 4 ) 2 O:0.1Eu 2+ Weigh CaHPO 4 , CaCO 3 、BaCO 3 and Eu 2 o 3 , the molar ratio between them is 2: 1.89: 0.01: 0.05, and the mixture is obtained after grinding and mixing; 2 +95%H 2 (volume ratio) nitrogen-hydrogen mixed atmosphere, calcined at 1400°C for 5 hours, and then cooled to room temperature to obtain a red phosphor suitable for blue light excitation. Such as figure 2 As shown, under the excitation of 465nm blue light, the phosphor powder of the present invention has an emission peak near 640nm and a full width at half maximum of 167nm, indicating that the phosphor powder of the present invention is suitable for two-wavelength conversion white LED phosphor powder excited by blue light.

Embodiment 3

[0032] A kind of phosphate yellow fluorescent powder excited by blue light, the chemical expression of this fluorescent powder is (Ca 3.969 Ba 0.03 )(PO 4 ) 2 O:0.001Eu 2+ , its preparation method comprises the steps: according to (Ca 3.969 Ba 0.03 )(PO 4 ) 2 O:0.001Eu 2+ Weigh CaHPO 4 , CaCO 3 、BaCO 3 and Eu 2 o 3 , the molar ratio between them is 2: 1.969: 0.01: 0.0005, and the mixture is obtained after grinding and mixing; 2 +95%N 2 (volume ratio) nitrogen-hydrogen mixed atmosphere, baked at 1400° C. for 4 hours, and then cooled to room temperature to obtain an orange phosphor suitable for blue light excitation. Such as image 3 As shown, under the excitation of 465nm blue light, the phosphor powder of the present invention has an emission peak near 630nm and a full width at half maximum of 190nm, indicating that the phosphor powder of the present invention is suitable for two-wavelength conversion white LED phosphor powder excited by blue light.

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Abstract

The invention relates to the field of fluorescent powder, in particular to phosphate yellow fluorescent powder excited by blue light, which has the following chemical representative expression: (Ca4-x-yBax) (PO4) 2O: yEu2+, wherein x=0.01 to 1, and y=0.001 to 0.10. The phosphate yellow fluorescent powder excited by the blue light has the advantages of being good in dispersity, even in granularity, high in luminous intensity, good in chemical stability and capable of being excited effectively and manufacturing light-emitting diodes (LEDs) with high brightness while light. An exciting band of the phosphate yellow fluorescent powder is overlapped with gallium nitride LEDs with blue light.

Description

technical field [0001] The invention relates to the field of fluorescent powder, in particular to a phosphate yellow fluorescent powder suitable for blue light excitation and a preparation method thereof. Background technique [0002] White LED is a solid-state semiconductor device that converts electrical energy into white light, also known as semiconductor lighting. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. , Fluorescent lamps, and high-pressure gas discharge lamps are the fourth generation of lighting sources, which will be the mainstream products in the future lighting market. [0003] At present, the common way to realize white LED is to coat the blue LED chip with highly efficient phosphor powder that can be excited by blue light and emit yellow light. The principle is that the blue LED excites the fluorescent material to produce yellow light complementary to blue light. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/71
Inventor 徐时清邓德刚华有杰李银群王焕平赵士龙黄立辉夹国华李银燕
Owner CHINA JILIANG UNIV