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White-light LED (light-emitting diode) fluorescent powder and preparation method thereof

A phosphor, white light technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of unstable chemical properties, expensive raw materials, harsh synthesis conditions, etc. Simple, chemically stable effects

Inactive Publication Date: 2013-11-27
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Eu 2+ The excitation and emission spectra of activated alkaline earth metal thiogallate meet the requirements of white LED phosphors, but the synthesis process produces toxic H 2 S gas and chemically unstable
Eu 2+ The excitation and emission spectra of activated nitrogen oxides also meet the requirements of white LED phosphors, but the synthesis conditions are harsh and the raw materials are expensive

Method used

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  • White-light LED (light-emitting diode) fluorescent powder and preparation method thereof
  • White-light LED (light-emitting diode) fluorescent powder and preparation method thereof
  • White-light LED (light-emitting diode) fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 8(Sr 0.96 Eu 0.04 )O·6Al 2 O 3 ·2MoO 3 Phosphors can be made using the following methods:

[0030] Weigh Europium oxide (Eu 2 O 3 )0.56g, strontium carbonate (SrCO 3 ) 11.34g, alumina (Al 2 O 3 )6.12g, ammonium molybdate [(NH 4 ) 6 Mo 7 O 24 ·4H 2 O] 3.53g, mix the mixture uniformly in an agate mortar, put it in a corundum crucible in a carbon monoxide reducing atmosphere, keep it at a temperature of 1200°C for 8 hours, cool the sintered product, grind, and sieve to obtain LED phosphors. The photoluminescence spectrum of the obtained phosphor is as figure 1 .

Embodiment 2

[0032] 8(Sr 0.99 Eu 0.01 )O·6Al 2 O 3 ·2MoO 3 Phosphors can be made using the following methods:

[0033] Weigh Europium oxide (Eu 2 O 3 )0.14g, strontium carbonate (SrCO 3 ) 11.69g, alumina (Al 2 O 3 )6.12g, ammonium molybdate [(NH 4 ) 6 Mo 7 O 24 ·4H 2 O] 3.53g, mix the mixture uniformly in an agate mortar, put it in a corundum crucible in a carbon monoxide reducing atmosphere, keep it at a temperature of 1200°C for 8 hours, cool the sintered product, grind, and sieve to obtain LED phosphors.

Embodiment 3

[0035] 8(Sr 0.90 Eu 0.10 )O·6Al 2 O 3 ·2MoO 3 Phosphors can be made using the following methods:

[0036] Weigh Europium oxide (Eu 2 O 3 )1.41g, strontium carbonate (SrCO 3 ) 10.63g, alumina (Al 2 O 3 )6.12g, ammonium molybdate [(NH 4 ) 6 Mo 7 O 24 ·4H 2 O] 3.53g, mix the mixture uniformly in an agate mortar, put it in a corundum crucible in a carbon monoxide reducing atmosphere, keep it at a temperature of 1200°C for 8 hours, cool the sintered product, grind, and sieve to obtain LED phosphors.

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Abstract

The invention discloses a preparation method of white-light LED (light-emitting diode) fluorescent powder and belongs to the field of flourescent materials. The chemical constituents of the fluorescent powder are 8(Al-xEux)O.6Al2O3.2MO3, and accord with the following conditions: A is any one of Ca (calcium), Sr (strontium) and Ba (barium); M is any one of Mo (molybdenum) and W (tungsten); Eu (europium) is a luminescence centre and doped at A bit, and x is smaller than or equal to 0.10 and greater than or equal to 0.01. The preparation method comprises the following steps of: respectively weighing and mixing the materials uniformly according to mol ratio of elements, packaging the materials into a corundum crucible, preserving the materials for 6-8 hours at 1000-1200 DEG C in reducing atmosphere of carbon monoxide, grinding the sintered product after cooling the product, and sieving the product to obtain the LED fluorescent powder. The fluorescent powder is wide in excitation spectrum range, adjustable in emission wavelength, simple in preparation technology, stable in chemical property and excellent in luminescence property, and is ideal white-light LED fluorescent powder.

Description

Technical field [0001] The invention belongs to the field of white light LED luminescent materials, and relates to a white light diode phosphor with wide excitation spectrum coverage, adjustable emission wavelength and matching with near ultraviolet light emitting diodes (LEDs). Background technique [0002] White light emitting diodes are a new generation of green and environmentally friendly solid-state lighting green light sources with low energy consumption, long life, small size, very stable structure, good light directivity, fast response, no radiation, and suitable for harsh environments. At present, there are not many types of phosphors suitable for excitation by near-ultraviolet chips and blue chips, especially for blue chips, especially green phosphors. Eu 2+ The excitation and emission spectra of the activated alkaline earth metal thiogallate meet the requirements of white LED phosphors, but the synthesis process produces toxic H 2 S gas is also chemically unstable. E...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00
Inventor 张新民孟凡桂
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY