Abstract: Small particle manganese activated alkaline earth aluminate phosphors are produced by thermal decomposition of gels or powders comprising alkaline earth, manganese salts and an organic precursor such as aluminum isopropoxide at a temperature below the normal solid state reaction temperature. The phosphor of the present invention has the empirical formula: (AE1-xMnx)O·6(Al2O3) wherein AE is selected from Ba, Sr, Ca and Mg and 0.01≦×≦0.1, having a band emission in the green region, peaking at 516 nm when excited by 147 and 173 nm radiation from Xenon gas mixture. The phosphor obtained by the present method, having uniform particle size distribution (0.05 to 5 microns), is appropriate for thin phosphor screens required for a variety of flat panel display and lamp applications.

Abstract: Yttrium, gadolinium borate phosphor particles are produced by thermal decomposition of a xerogel or an aerogel including Rare Earth (yttrium, gadolinium and europium) and Alkaline Earth (barium, strontium, calcium, magnesium) salts. A sol-gel method is used and an organic precursor such as trimethyl borate obtains the respective xerogel or aerogel. Thermal decomposition of the gel takes place at a temperature well below the normal temperature of solid state reaction synthesis. The brightness of the final phosphor is improved by 5 to 10 by mixing the gel powder with respective nitrates thereof prior to calcination. The phosphor has the empirical formula: (Y1−x−y−z EuxGdy Mz)BO3 wherein: 0.01≦x≦0.1, 0≦y≦0.5, M=Ba/Sr/Ca/Mg and z≦0.1.

Abstract: A stable phosphor complex or blend includes a lanthanum phosphate phosphor with Tm3+ as an activator, Li+ and an optional amount of an alkaline earth element (AE2+) as a coactivator, having the empirical formula:: (La1-x-zTmxLiyAEz)PO4, wherein 0.001≦x≦0.05, 0.01≦y≦0.05, and 0≦z≦0.05; and 15 to 30% by weight of either: (i) divalent europium-activated barium, magnesium, aluminate (BAM), having an empirical formula: (Ba1-xEux)O MgyO (Al2O3)z, wherein 0.005≦x≦0.05 and 1≦y≦2; or (ii) divalent europium-activated barium, magnesium, lanthanum aluminate (BLMA), having an empirical formula: (Ba1-xEux)O MgyO (Al2-vLAvO3)z, wherein 0.005≦x≦0.05, 1≦y≦2, 5≦z≦7 and 0.1≦v≦1; or (iii) divalent europium activated alkaline earth chloro apatite (AECAP) having an empirical formula: (x.Sr,y.Ba,z.Cz,u.Mg)5(PO4)3Cl, wherein x+y+z+u=0.1, 0≦x≦1.0, 0≦y≦1.0, 0≦z≦1.0 and 0≦u≦1.

Abstract: Improved yttrium, gadolinium borate phosphor particles are produced by thermal decomposition of gels/solutions comprising yttrium, gadolinium and europium salts in the form of gels or solutions and an organic precursor such as trimethyl borate at a temperature well below the normal temperature of solid state reaction. The phosphor of the present invention has the empirical formula:(Y.sub.1-x-y-z Eu.sub.x Gd.sub.y M.sub.z)BO.sub.3wherein: 0.01.ltoreq.x.ltoreq.0.1, 0.ltoreq.y.ltoreq.0.5, M=Mg, Ca, Sr or Ba and 0.ltoreq.z.ltoreq.0.1.

Abstract: Small particle yttrium, gadolinium, terbium and cerium borate phosphors are produced by thermal decomposition of gels or solutions or powders containing yttrium, gadolinium, terbium and cerium salts and an organic precursor such as trimethyl borate or boric acid at a temperature below the normal temperature of solid state reaction. The phosphor of the present invention has the empirical formula:(Y.sub.1-x-y-z Gd.sub.x Tb.sub.y Ce.sub.z)BO.sub.3wherein: 0.0.ltoreq.x.ltoreq.0.2, 0.01.ltoreq.y.ltoreq.0.1, and 0.0.ltoreq.z.ltoreq.0.1.

Abstract: Small particle lanthanum, thulium phosphate phosphors are produced by thermal decomposition of gels or solutions or powders including lanthanum, 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:(La.sub.1-x-y-z Tm.sub.x Li.sub.y Sr.sub.z)PO.sub.4wherein: 0.001.ltoreq.x.ltoreq.0.05; 0.01.ltoreq.y.ltoreq.0.05; and 0.0.ltoreq.z.ltoreq.0.05and exhibits a narrow band emission in blue region, peaking at 453 nm when excited by 147 and 173 nm radiation from Xenon gas mixture. The phosphor exhibits uniform and spherical shape particles in the range 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 method of preparation.

Abstract: Improved zinc orthosilicate phosphor particles are produced by thermal decomposition of gels comprising zinc and manganese salt and an organic precursor that provides a source of silicon at a temperature below the temperature of solid state reaction. The phosphor of the present invention has the empirical formula:Zn.sub.(2-x) Mn.sub.x SiO.sub.4wherein 0.005.ltoreq.x.ltoreq.0.15, and provides a broad emission in a green region when excited by 147 nm and 172 nm radiation. The phosphor obtained by the present method has uniform spherical or needle shape particles having an average particle size in the range 0.1 to 3 microns, is appropriate for thin phosphor screens required for a variety of flat panel display and lamp applications. These phosphors exhibit high brightness and shorter decay when excited with 147 nm and 172 nm radiation than currently available commercial phosphors of this type.