Fluorescent material

Details Fluorescent material Fluorescent material

C - Chemistry, Metallurgy

09

K

31/128

C09K 11/465 (1980.01)

Patent

CA 1127385

ABSTRACT OF THE DISCLOSURE A fluorescent material is an alkaline earth metal boron phosphate activated by a divalent europium compound having the formula m(Sr1-x-y-pBaxCayEupO).(l-n)P2O5-nB2O3 wherein parameters x,y,p,m and n are respectively in the ranges: 0 ? x ? 0.5 0 ? y ? 0.2 0.001 ? p ? 0.15 1.75 ? m ? 2.30 0.05 ? n ? 0.23 BACKGROUND OF THE INVENTION: The present invention relates to novel bluish green emitting fluorescent materials of alkaline earth metal boron phosphates acti- vated by a divalent europium compound. In the specification, the fluorescent material means "phosphor" and the boron phosphate means "borate phosphate". Heretofore, it has been well ksown that strontium-magnesium phosphate activated with copper (Sr,Hg)3(PO4)2 : Cu and calcium halophosphate activated by antimony Ca10(PO4)6(F,C1)2 : Sb are used as typical fluorescent material emitting in bluish green wavelength region under exciting it by ultraviolet radiation or cathode radiation.

331406

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