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Nitrogen oxide yellowgreen fluorescent powder for LED and preparation method for nitrogen oxide yellowgreen fluorescent powder

A technology of yellow-green fluorescent powder and nitrogen oxides, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of microscopic inhomogeneity of product composition, complex process conditions, high synthesis temperature, etc., and achieve improved luminous brightness, small particles, The effect of low synthesis temperature

Inactive Publication Date: 2012-07-04
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all methods have their advantages and disadvantages: although the high-temperature solid-phase method is simple to operate, it has disadvantages such as high synthesis temperature and microscopic inhomogeneity of the product composition, and some new preparation processes overcome these disadvantages but bring New problems have been identified, such as high equipment requirements, complex process conditions and difficult control, etc.

Method used

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  • Nitrogen oxide yellowgreen fluorescent powder for LED and preparation method for nitrogen oxide yellowgreen fluorescent powder
  • Nitrogen oxide yellowgreen fluorescent powder for LED and preparation method for nitrogen oxide yellowgreen fluorescent powder
  • Nitrogen oxide yellowgreen fluorescent powder for LED and preparation method for nitrogen oxide yellowgreen fluorescent powder

Examples

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Effect test

Embodiment 1

[0030] Ca 0.98 Si 2 o 2 N 2 : Preparation of 0.02Eu phosphor powder:

[0031] 1) Synthesis of the precursor Ca of the yellow-green phosphor by hydrothermal method 1.96 SiO 4 :0.04Eu 2+ :

[0032] Weigh 0.5ml of tetraethyl orthosilicate (TEOS), dissolve it in a mixed solution composed of ethanol and oleic acid, wherein the content of ethanol is 25ml, and the content of oleic acid is 37.5ml; then slowly add nitric acid under stirring Europium 0.078g, mixed solution A is obtained after fully mixing and dissolving;

[0033] Take by weighing calcium acetate 0.771g, be dissolved in the mixed solution that is made up of saturated ammoniacal liquor and deionized water, wherein the content of ammoniacal liquor is 6ml, and the content of deionized water is 25ml, obtain mixed solution B after fully mixing and dissolving;

[0034] Mix the mixed solution A and the mixed solution B and pour it into a high-pressure reaction kettle, put it on a magnetic stirrer and stir for 5 hours, a...

Embodiment 2

[0039] Ca 0.98 Si 2 o 2 N2 : Preparation of 0.02Eu phosphor powder:

[0040] 1) The first step is to synthesize the precursor Ca of the yellow-green phosphor by hydrothermal method 1.96 SiO 4 :0.04Eu:

[0041] Weigh 0.5ml of tetraethyl orthosilicate (TEOS), dissolve it in a mixed solution composed of ethanol and oleic acid, wherein the content of ethanol is 25ml, and the content of oleic acid is 50ml; then slowly add europium nitrate under stirring 0.078g, mixed solution A was obtained after fully mixing and dissolving;

[0042] Take by weighing calcium acetate 0.771g, be dissolved in the mixed solution that is made up of saturated ammoniacal liquor and deionized water, wherein the content of ammoniacal liquor is 6ml, and the content of deionized water is 25ml, obtain mixed solution B after fully mixing and dissolving;

[0043] Mix the mixed solution A and the mixed solution B and pour it into a high-pressure reaction kettle, put it on a magnetic stirrer and stir for 5 h...

Embodiment 3

[0048] Ca 0.96 Si 2 o 2 no 2 : Preparation of 0.04Eu phosphor powder:

[0049] 1) Synthesis of the precursor Ca of the yellow-green phosphor by hydrothermal method 1.92 SiO 4 :0.08Eu:

[0050] Weigh 1ml of tetraethyl orthosilicate (TEOS), dissolve it in a mixed solution composed of ethanol and oleic acid, wherein the content of ethanol is 25ml, and the content of oleic acid is 57.5ml; then slowly add europium nitrate under stirring 0.139g, mixed solution A was obtained after fully mixing and dissolving;

[0051] Take calcium acetate 1.319g, be dissolved in the mixed solution that is made up of saturated ammoniacal liquor and deionized water, wherein the content of ammoniacal liquor is 10ml, and the content of deionized water is 45ml, obtain mixed solution B after fully mixing and dissolving;

[0052] Mix the mixed solution A and the mixed solution B and pour it into a high-pressure reactor, put it on a magnetic stirrer and stir for 5 hours, adjust the temperature of the...

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Abstract

The invention discloses a nitrogen oxide yellowgreen fluorescent powder for an LED and a preparation method of the nitrogen oxide yellowgreen fluorescent powder. The chemical structural formula is A1-xSiyOzN2 / 3+4 / 3y-2 / 3z:xEu. The preparation method adopts two steps to synthesize the yellowgreen fluorescent powder: in the first step, synthesizing a precursor A2SiO4:Eu of the yellowgreen fluorescent powder by a hydrothermal method, wherein A is Ca or Sr, and the precursor provides a stable crystal structure; in the second step, adding nitride into the precursor and synthesizing the nitrogen oxide yellowgreen fluorescent powder by a high temperature solid phase method, wherein the light emitting wavelength is ranged from 530nm to 45nm. The fluorescent powder has small particles, is free from remarkably clotting after sintering, is loose as a whole and do not need to be grinded and smashed powerfully, thereby lowering the reduction of distribution rate caused by grinding and improving the light emitting stability of the fluorescent powder.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder for LEDs, and relates to a nitrogen oxide yellow-green fluorescent powder for LEDs and a preparation method thereof. Background technique [0002] White light LED is a hot spot for current and future development. The combination of blue chip + phosphor and UV chip + phosphor is the mainstream of realizing white light LED, providing new space for the development of phosphor. At present, only the blue chip + yellow light-emitting phosphor YAG:Ce white LED has been commercialized. It can meet the general lighting requirements of white LEDs as indicator lights and signal lights. However, if white LEDs are to replace fluorescent lamps as a new generation of indoor solid-state lighting sources, It requires higher lumen efficiency, higher color rendering, and better adjustability of the color temperature of white light emission. Most of the traditional phosphors used in fluorescent lamps can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
Inventor 赵莉
Owner IRICO
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