White-light fluorescent powder and preparation method thereof and white light-emitting device

A technology of light-emitting devices and phosphors, applied in the direction of light-emitting materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of low production costs, and achieve the effects of low production costs, high purity, and good chemical stability

Inactive Publication Date: 2015-09-02
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a white light phosphor and its preparation method and application. The phosphor can be directly excited by the near-ultraviolet LED chip to obtain white light with excellent color purity without the assistance of other phosphors, which can make up for the current The shortcomings of using a single-phase white phosphor in the luminescent material; the preparation method of the white phosphor provided by the invention is simple, the energy consumption is small, there is no industrial waste, the production cost is low, and it can be popularized and applied; the invention also provides the white phosphor in the Applications in white light emitting devices

Method used

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  • White-light fluorescent powder and preparation method thereof and white light-emitting device
  • White-light fluorescent powder and preparation method thereof and white light-emitting device
  • White-light fluorescent powder and preparation method thereof and white light-emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A white phosphor LiY 0.933 Dy 0.06 Eu 0.007 (Mo 0.6 W 0.4 o 4 ) 2 The preparation method comprises the following steps:

[0059] (1) According to the chemical formula LiY of the target product 0.933 Dy 0.06 Eu 0.007 (Mo 0.6 W 0.4 o 4 ) 2 , take the raw materials by the mol ratio of Li:Y:Dy:Eu:Mo:W=1:0.933:0.06:0.007:1.2:0.8, take by weighing 0.0224g of dysprosium oxide with an electronic balance, add 20ml of deionized water and stir, And add 20ml of nitric acid with a concentration of 0.1mol / L to dissolve, and remove the excess nitric acid by heating to obtain a dysprosium nitrate solution, then add 0.1379g of lithium nitrate, 0.0063g of europium nitrate and 0.7146g of yttrium nitrate to the dysprosium nitrate solution , and add 20ml of deionized water and stir to prepare a metal nitrate mixed solution;

[0060] Then take by weighing 0.4237g ammonium molybdate tetrahydrate and 0.4056g ammonium tungstate (molecular weight is 3042.58), add 50ml deionized wat...

Embodiment 2

[0077] A white phosphor LiY 0.933 Dy 0.06 Eu 0.007 (Mo 0.6 W 0.4 o 4 ) 2 The preparation method comprises the following steps:

[0078] (1) According to the chemical formula LiY of the target product 0.933 Dy 0.06 Eu 0.007 (Mo 0.6 W 0.4 o 4 ) 2 , take the raw materials by the mol ratio of Li:Y:Dy:Eu:Mo:W=1:0.933:0.06:0.007:1.2:0.8, take by weighing 0.0224g of dysprosium oxide with an electronic balance, add 20ml of deionized water and stir, And add 20ml of nitric acid with a concentration of 0.1mol / L to dissolve, and remove the excess nitric acid by heating to obtain a dysprosium nitrate solution, then add 0.1379g of lithium nitrate, 0.0063g of europium nitrate and 0.7146g of yttrium nitrate to the dysprosium nitrate solution , and add 20ml of deionized water and stir to prepare a metal nitrate mixed solution;

[0079] Then weigh 0.4237g of ammonium molybdate tetrahydrate and 0.4056g of ammonium tungstate, add 50ml of deionized water, and add 7.35g of citric acid...

Embodiment 3

[0084] A white phosphor LiY 0.933 Dy 0.06 Eu 0.007 (Mo 0.6 W 0.4 o 4 ) 2 The preparation method comprises the following steps:

[0085] (1) According to the chemical formula LiY of the target product 0.933 Dy 0.06 Eu 0.007 (Mo 0.6 W 0.4 o 4 ) 2 , take the raw materials by the mol ratio of Li:Y:Dy:Eu:Mo:W=1:0.933:0.06:0.007:1.2:0.8, take by weighing 0.0224g of dysprosium oxide with an electronic balance, add 20ml of deionized water and stir, And add 20ml of nitric acid with a concentration of 0.1mol / L to dissolve, and remove the excess nitric acid by heating to obtain a dysprosium nitrate solution, then add 0.1379g of lithium nitrate, 0.0063g of europium nitrate and 0.7146g of yttrium nitrate to the dysprosium nitrate solution , and add 20ml of deionized water and stir to prepare a metal nitrate mixed solution;

[0086] Then weigh 0.4237g of ammonium molybdate tetrahydrate and 0.4056g of ammonium tungstate, add 50ml of deionized water, and add 4.15g of citric acid...

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Abstract

The invention provides white-light fluorescent powder. A chemical formula of the white-light fluorescent powder is AY1-xLnx(Mo1-yWyO4)2, wherein A is one or more of Li, Na and K; Ln is multiple of Tm, Tb, Sm, Eu and Dy, but Eu and Dy can be included; the value range of x is that x is smaller than 1 and greater than 0; the value range of y is that y is smaller than 0.5 and greater than 0; the fluorescent powder can be directly stimulated by a near-ultraviolet LED (light-emitting diode) chip to obtain white light with excellent color purity; an assistant of other fluorescent powder is not needed; and the defects of single-phase white-light fluorescent powder in an existing luminescent material can be overcome. The invention further provides a preparation method of the white-light fluorescent powder. The preparation method is simple and low in production cost, and can be popularized and applied. In addition, the invention further provides application of the white-light fluorescent powder in preparation of white light-emitting devices.

Description

technical field [0001] The invention relates to the technical field of white light LED phosphor powder, in particular to a white light phosphor powder, a preparation method thereof and a white light emitting device. Background technique [0002] With the development of modern society and economy, the problems of energy consumption and environmental pollution are becoming more and more serious, and the lighting methods of energy saving and environmental protection are getting more and more attention from the governments and industries of various countries. White LED (Light Emitting Diode, Light Emitting Diode) is known as the fourth generation lighting technology by industry insiders due to its remarkable advantages such as small size, low energy consumption, long life, and no pollution. [0003] At present, the realization of white LED lighting is mainly realized by the LED chip and the phosphor powder matched with the chip. The emitted yellow light is combined to obtain wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/00
Inventor 卢周广王文浠
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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