Blue fluorescent powder for three-primary-color warm white LEDs and preparation method of blue fluorescent powder

A blue phosphor, warm white light technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of low color rendering index, increased cost of phosphors, and difficulty in matching warm colors.

Active Publication Date: 2018-05-29
杨鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, one way to achieve white light emission with high lumen efficiency is to use blue light chips to excite yellow phosphors. The most mature yellow phosphors are mainly YAG:Ce3+, which can be effectively excited by 440-480nm blue LED chips and form complementary forms with blue light. White light; however, this type of light-emitting method has defects such as poor color reproduction, low color rendering index, and difficulty in matching warm colors.
In recent years, there have also been some research reports on single-matrix white phosphors as phosphor materials for white LEDs, but most of them are cool white, and even some warm white phosphors are doped with at least two rare earth ions in the matrix. or elements to achieve luminescence, which not only increases the cost of the phosphor, but also directly leads to serious energy loss due to the inter-cascade excitation, and the final luminous efficiency of the phosphor is relatively low

Method used

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  • Blue fluorescent powder for three-primary-color warm white LEDs and preparation method of blue fluorescent powder
  • Blue fluorescent powder for three-primary-color warm white LEDs and preparation method of blue fluorescent powder
  • Blue fluorescent powder for three-primary-color warm white LEDs and preparation method of blue fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Strontium carbonate (SrCO 3 ), anhydrous ammonium chloride (NH 4 Cl), boric acid (H 3 BO 3 ), europium trioxide (Eu 2 o 3 ) and ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), placed in an agate mortar and thoroughly ground for 30 minutes and mixed evenly; the ground powder was roasted in a reducing atmosphere, heated to 1000°C at a heating rate of 5°C / min, sintered at this temperature for 6h, and cooled naturally to room temperature; the sample is taken out and ground to obtain a chemical formula of Sr 1.95 Eu 0.05 (BO 3 ) 0.25 (PO 4 ) 0.75 Cl phosphor. Its X-ray diffraction pattern (XRD) see figure 1 .

[0027] The raw material SrCO used in the embodiment of the present invention 3 (A.R.), NH 4 Cl(A.R.), H 3 BO 3 (A.R.), Eu 2 o 3 (99.99%) and NH 4 h 2 PO 4 (A.R.) are commercially available items.

[0028] The prepared Sr 1.95 Eu 0.05 (BO 3 ) 0.25 (PO 4 ) 0.75 Cl phosphor, with CaAlSiN under violet excitation 3 : Eu 2+ Red phosphor and ...

Embodiment 2

[0031] It is basically the same as that of Example 1, except that the chemical formula of the prepared fluorescent powder is different. Its X-ray diffraction pattern (XRD) see figure 1 .

[0032] Strontium carbonate (SrCO 3 ), anhydrous ammonium chloride (NH 4 Cl), boric acid (H 3 BO 3 ), europium trioxide (Eu 2 o 3 ) and ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), placed in an agate mortar and thoroughly ground for 30 minutes and mixed evenly; the ground powder was roasted in a reducing atmosphere, heated to 1000°C at a heating rate of 5°C / min, sintered at this temperature for 6h, and cooled naturally to room temperature; the sample is taken out and ground to obtain a chemical formula of Sr 1.99 Eu 0.01 (BO 3 ) 0.25 (PO4 ) 0.75 Cl phosphor.

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Abstract

The invention discloses blue fluorescent powder for three-primary-color warm white LEDs and a preparation method of the blue fluorescent powder. The preparation method comprises the steps of: adoptingstrontium carbonate (SrCO3), anhydrous ammonium chloride (NH4Cl), boric acid (H3BO3), europium oxide (Eu2O3) and ammonium dihydrogen phosphate (NH4H2PO4) as raw materials, and adopting a solid-phasesintering method in a reducing atmosphere to obtain the blue fluorescent powder with a chemical formula of Sr(2-x)Eux(BO3)y(PO4)(1-y)Cl, wherein 0.001<=x<=0.1, and 0.001<=y<=0.5. By mixing the blue fluorescent powder with CaAlSiN3:Eu<2+> red fluorescent powder and (SrBa)2SiO4:Eu<2+> green fluorescent powder at a certain ratio, near-ultraviolet light-excited warm-white light emission with high color rendering indexes and high luminous efficiency can be achieved, and the blue fluorescent powder has a very broad application prospect.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a blue fluorescent powder for a three-primary-color warm white LED and a preparation method thereof. Background technique [0002] The worldwide energy crisis has made white LED lighting a strategic plan for national development. The promotion of LED lighting is not only beneficial to the sustainable development of society and the environment, but also can drive related industries, enhance the competitiveness of my country's lighting industry, and will develop a number of emerging industries with independent intellectual property rights and international competitiveness, increasing employment. Opportunity is the most potential competitor who can replace traditional lighting in the future. It is of great significance to energy saving, unified lighting industry upgrading, and promoting the development of new manufacturing industries. [0003] At present, on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86H01L33/50
CPCC09K11/774H01L33/504C09K11/7763Y02B20/00C09K11/7739
Inventor 陈朝杨星陈佳超李扬
Owner 杨鹏
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