The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 1989
Filed:
Oct. 17, 1983
Takashi Hase, Ebina, JP;
Toshio Jinnai, Hiratsuka, JP;
Shigeo Fujino, Hiratsuka, JP;
Masato Hayashi, Odawara, JP;
Akio Toshinai, Ninomiya, JP;
Kasei Optonix, Ltd., , JP;
Abstract
A borate phosphor represented by the formula a(M.sup.II.sub.1-x, M.sup.IV.sub.x/2)O.bM.sup.V.sub.2 O.sub.5.cM.sup.I.sub.2 O.(B.sub.1-y-z,M.sup.III.sub.y, M.sup.VI.sub.z/2).sub.2 O.sub.3 :dCe,eTb wherein M.sup.II is at least one divalent metal selected from the group consisting of Mg, Be, Zn, Cd, Ca, Sr and Ba; M.sup.IV is at least one tetravalent element selected from the group consisting of Si, Ti, Ge, Zr, Sn, Th and Pb; M.sup.V is at least one pentavalent element selected from the group consisting of P, V, Nb, Sb, Ta and As; M.sup.I is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M.sup.III is at least one trivalent metal selected from the group consisting of Al, Sc, Ga, Y, In, La, Lu, Gd, Bi and Tl; M.sup.VI is at least one hexavalent meteal selected from the group consisting of Mo, Te and W; and a, b, c, d, e, x, y and z are numbers satisfying the conditions of 0<a.ltoreq.2.0; 0.ltoreq.b.ltoreq.0.3; 0.ltoreq.c.ltoreq.0.3, 0<d.ltoreq.0.6, 0.ltoreq.e.ltoreq.0.6, 0.ltoreq.x.ltoreq.0.6, 0.ltoreq.y.ltoreq.0.35 and 0.ltoreq.z.ltoreq.0.01, respectively. The phosphor emits blue to green light of high luminance under excitation of ultraviolet rays, cathode rays, X-rays, vacuum ultraviolet rays, or the like. Particularly, the phosphor emits blue to green light of higher luminance than the conventional cerium activated or cerium and terbium activated oxide phosphors under excitation of ultraviolet rays or vacuum ultraviolet rays.