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Three-primary-colour fluorescent powder stimulated by purple-light LED and its synthesizing process

A technology of light-emitting diodes and synthesis methods, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps, and can solve problems such as the difficulty of realizing a single phosphor

Inactive Publication Date: 2003-02-19
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to realize a single phosphor that absorbs violet light and emits white light, and the three primary color phosphors of violet LEDs that have reached the application level have not been reported so far.

Method used

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  • Three-primary-colour fluorescent powder stimulated by purple-light LED and its synthesizing process
  • Three-primary-colour fluorescent powder stimulated by purple-light LED and its synthesizing process
  • Three-primary-colour fluorescent powder stimulated by purple-light LED and its synthesizing process

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Embodiment

[0022] 1.10.161g Y 2 o 3 , 11.70g Al(OH) 3 , 1.0518g BaF 2 , 0.1954g Eu 2 o 3 , Grind and mix evenly, and bake at 1450°C for 2 hours in a reducing atmosphere in the presence of carbon powder to obtain white YAG: Eu.

[0023] 2.18.37 g SrHPO 4 , 7.136 g SrCO 3 , 26.66g SrCl 2 .6H 2 O, 0.293g Eu 2 o 3 , Grind and mix evenly, and bake at 1100°C for 2 hours in a reducing atmosphere with activated carbon to obtain a white molten block, soak it in boiling water to wash away the excess SrCl 2 , dried to obtain white Sr 9.98 (PO 4 ) 6 Cl 2 : 0.02Eu.

[0024] 3.10.161g Y 2 o 3 , 11.70g Al(OH) 3 , 1.0518g BaF 2 , 0.655g Ce(NO 3 ) 3 .6H 2 The aqueous solution of O was dried at 100°C, ground and mixed evenly, and calcined at 1450°C for 2 hours in a reducing atmosphere with activated carbon to obtain bright yellow YAG:Ce.

[0025] 4. Mix red powder, blue powder and green powder with a mass ratio of 0.8:1:3 to obtain a white phosphor that matches the purple LED. The c...

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Abstract

A three-primary-color fluorescent powder excited by violet-light LED is composed of the red powder whose emission peak is in red light region, the blue powder whose emission peak is in blue light region and the green powder whose emission peak is in green light region, and can emit white light under excitation of violet-light LED. It is prepared through high-temp solid-phase reaction to prepare red powder (3-valence Eu activated YAG), blue powder (2-valence Eu activated strontium / calcium chlorophosphate) and green powder (Ce activated YAG), and mxing in Wt. ratio of (0.5-2):(0.7-2.3):(2-5).

Description

[0001] Technical field: the present invention relates to a phosphor mixture, especially a phosphor that matches the purple light emission of a semiconductor light-emitting diode (LED) to produce white light, and a preparation method. Background technique: [0002] Gallium Nitride (GaN) blue LED (460nm excitation) white light phosphor research and development has made great progress, but blue LED luminous efficiency is low. GaN violet LEDs emitting at 390nm-400nm are currently the focus of research. However, it is difficult to realize a single phosphor that absorbs violet light and emits white light, and the three primary color phosphors of violet LEDs that have reached the application level have not been reported so far. Contents of the invention [0003] The object of the present invention is to provide a three-primary-color fluorescent powder that matches the violet emission of semiconductor light-emitting diodes and produces white light. [0004] The three-primary-color ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
CPCY02B20/181Y02B20/00
Inventor 姚光庆段洁菲施建新林建华
Owner PEKING UNIV
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