| 摘要 |
Small particle lanthanum, thulium phosphate phosphors are produced by thermal decomposition of gels or solutions or powders including lanthanium, thulium, lithium and alkaline earth salts and an organic precursor, such as trimethyl phosphate and boric acid, at a temperature well below the normal temperature of solid state reaction. The phosphor of the present invention has the empirical formula: (Lal-x-y-zTmxLiySrz)PO4, wherein: 0.001 </= x </= 0.05; 0.01 </= y </= 0.05; and 0.0 </= z </= 0.05 and exhibits a narrow band emission in the blue region, peaking at 453 nm when excited by 147 nm and 173 nm radiation from a Xenon gas mixture. The phosphor exhibits uniform and spherical shaped particles in a range of 0.1 to 5 microns, and is appropriate for thin phosphor screens required for a variety of flat panel display and lamp applications. The particle size varies with the method of preparation. The phosphors also exhibit high brightness, good color saturation, better stability and shorter persistence when excited with 147 and 173 nm radiation than Mn activated zinc silicate phosphors currently used in plasma display panels.
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