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A kind of fluorescent powder for warm white LED and preparation method thereof

A phosphor, warm white light technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of reduced luminous efficiency, high cost, doping more rare earth ions, etc., and achieves short preparation time, high production efficiency, and luminescence. high intensity effect

Active Publication Date: 2019-05-07
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a phosphor for warm white LED and its preparation method to solve the problems that the preparation of existing warm white phosphor needs to be doped with more rare earth ions, resulting in higher cost and lower luminous efficiency

Method used

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  • A kind of fluorescent powder for warm white LED and preparation method thereof
  • A kind of fluorescent powder for warm white LED and preparation method thereof
  • A kind of fluorescent powder for warm white LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh calcium carbonate (CaCO 3 ) 1.5736g, anhydrous calcium chloride (CaCl 2 ·5H 2 O) 0.6017g, boric acid (H 3 BO 3 )0.4505g europium trioxide (Eu 2 o 3 )0.0954g and ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 0.4489g, placed in an agate mortar and thoroughly ground for 30 minutes and mixed evenly; the ground powder was placed in a small dry pot and buried in a carbon powder reducing atmosphere for roasting, and the heating rate was 5 ° C / min to heat up to 940°C, sintered at this temperature for 4 hours, and naturally cooled to room temperature; the sample was taken out and ground, and the chemical formula was Ca 1.95 Eu 0.05 (BO 3 ) 0.64 (PO 4 ) 0.36 Cl's white phosphor.

Embodiment 2

[0026] Weigh calcium carbonate (CaCO 3 ) 1.5736g, anhydrous calcium chloride (CaCl 2 ·5H 2 O) 0.6017g, boric acid (H 3 BO 3 )0.4786g europium trioxide (Eu 2 o 3 )0.0954g and ammonium dihydrogen phosphate (NH 4 h 2 PO 4) 0.3990g, placed in an agate mortar and ground for 30 minutes and mixed evenly; the ground powder was placed in a small dry pot and buried in a carbon powder reducing atmosphere for roasting, and the heating rate was 5 ° C / min to heat up to 950°C, sintered at this temperature for 4 hours, and naturally cooled to room temperature; the sample was taken out and ground, and the chemical formula was Ca 1.95 Eu 0.05 (BO 3 ) 0.68 (PO 4 ) 0.32 Cl's white phosphor.

Embodiment 3

[0028] Weigh calcium carbonate (CaCO 3 ) 1.5736g, anhydrous calcium chloride (CaCl 2 ·5H 2 O) 0.6017g, boric acid (H 3 BO 3 )0.4646g europium trioxide (Eu 2 o 3 )0.0954g and ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 0.4240g, placed in an agate mortar and thoroughly ground for 30 minutes and mixed evenly; the ground powder was placed in a small dry pot and buried in a carbon powder reducing atmosphere for roasting, and the heating rate was 5 ° C / min to heat up to 1000°C, sintered at this temperature for 3 hours, and cooled naturally to room temperature; the sample was taken out and ground, and the chemical formula was Ca 1.95 Eu 0.05 (BO 3 ) 0.66 (PO 4 ) 0.34 Cl's white phosphor.

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Abstract

The invention discloses a phosphor used for warm white LED. The chemical general formula of the phosphor is Ca1.95Eu0.05(BO3)1-x(PO4)xCl, wherein x is not less than 0.32 and not more than 0.38. A preparation method of the phosphor comprises the following steps: 1, weighing raw materials according to a molar ratio of all elements in the chemical general formula of the phosphor, mixing the raw materials, and grinding the raw materials to obtain a mixture; 2, placing the mixture in reducing atmosphere, and carrying out high temperature calcination to obtain a sintered body; and 3, cooling the sintered body to room temperature, and grinding the cooled sintered body to obtain the phosphor. The phosphor prepared in the invention has the advantages of wide excitation wavelength range, high luminescence intensity, good stability and high color rendering index, has a color temperature of 4353 k, can be effectively excited by specific ultraviolet wavelength to emit bright warm lights, and has a luminous efficiency reaching up to 24.4 lm / w after undergoing single powder packaging; and a single rare earth Eu<2+> doped novel solid solution synthesized through changing the anion ratio of a matrix is adopted in the invention, so the production cost is greatly lower than that in the prior art, and the preparation method also has the advantages of simplicity, easiness in operation and control, high safety, short preparation time, high production efficiency, and suitableness for industrial large-scale production and promotion application.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a fluorescent powder for warm white LEDs and a preparation method thereof. Background technique [0002] In the field of lighting, white LEDs are considered to be the fourth generation of lighting sources to replace traditional incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. Color rendering index is an important parameter to measure white LED devices. One way to achieve high lumen-efficiency white light emission is to excite yellow phosphors with blue chips. For this reason, technicians in the industry have actively carried out research on yellow phosphor matrix, such as Nichia patent US5998925, which has developed a chemical formula of (Y 1-x ,Sm x ) 3 (Al 1-y , Ga y ) 5 o 12 : Ce 3+ ; As another example, Osram (Osram) patent US6669866 has reported that the general chemical formula is (Tb 1-x-y , Re x , Ce y ) 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/73
CPCC09K11/774
Inventor 李盼来田苗苗王志军杨志平
Owner HEBEI UNIVERSITY
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