Red fluorescent powder for white radiation LED and preparation thereof

A technology for red phosphor powder and white light, applied in the field of red phosphor powder and its preparation, can solve the problems of low luminous efficiency, high sintering temperature and high production cost, and achieve the effects of simple preparation method, good radiation resistance and low cost
CN101343541AInactive Publication Date: 2009-01-14JIANGSU TIWIN OPTO ELECTRONICS TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGSU TIWIN OPTO ELECTRONICS TECH
Publication Date
2009-01-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses red fluorescent powder used for a white LED. The chemical expression is that R<1>2R<2>1-x(R<3>O4) (R<4>O4) : xEu<3+>, wherein, R<1> is one, two or more of Li<+>, Na<+>, K<+>, Rb<+> and Ag<+>; R<2> is one, two or more of La<3+>, Gd<3+>, Y<3+>, Pr<3+>, Sm<3+>, Eu<3+>, Bi<3+>, B<3+> and Al<3+>; R<3> is P<5+>, P<5+> and V<5+>, P<5+> and Nb<5+>, or P<5+> and V<5+> as well as Nb<5+>; R<4> is W<6+> and Mo<6+>; x is 0.005 to 1.0. The preparation method of the red fluorescent powder comprises the following steps: firstly, raw material containing R<1>, R<2>, Eu<3+>, R<3> and R<4> is porphyrized and evenly mixed, dried and porphyrized again and positioned into a muffle to be sintered; secondly, the red fluorescent powder is obtained after post-processing. The red fluorescent powder of the invention can be effectively excitated by blue light, black light or ultraviolet light, the light and thermal stability is good, the red luminous intensity is high, and the color purity is ideal.
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Description

technical field

[0001] The invention relates to a red fluorescent powder and a preparation method thereof, in particular to a red fluorescent powder for white LEDs and a preparation method thereof. Background technique

[0002] At present, the activator used in red phosphor powder for white light LED is based on divalent europium ion (Eu 2+ ) and europium ions (Eu 3+ ) mainly. Eu 2+ Ions are important rare earth activators, but because their 5d electrons are "bare" and are strongly affected by the surrounding crystal field environment, when doped into different matrix compounds, the main emission peaks vary greatly, and the luminescence Color varies with substrate. In addition, in order to maintain the corresponding valence state, a reducing protective atmosphere such as a mixed gas of 95% nitrogen and 5% hydrogen or ammonia must be used in the synthesis process. This limits the Eu 2+ Used as an activator for red phosphors. Currently, the commercial red phosphors for ...

Claims

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