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:
Nov. 04, 1980
Filed:
Mar. 05, 1979
Ifay F Chang, Chappaqua, NY (US);
Merrill W Shafer, Yorktown Heights, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A series of solid solutions in the systems Zn.sub.2 SiO.sub.4 -Zn.sub.2 M.sup.+3.sub..5 M.sup.+5.sub..5 O.sub.4, is synthesized by practice of this disclosure. Solid reaction technique is used where M.sup.+3 and M.sup.+5 signify ions from Groups III and V of the periodic table. Large increases in the efficiency compared to the prior art P1 phosphor (Zn.sub.2 SiO.sub.4 :Mn) are achieved by substituting various combinations of Group III and V oxides for SiO.sub.2, e.g., Al and P to provide Zn.sub.2-y Mn.sub.y Si.sub.1-2x Al.sub.x P.sub.x O.sub.4. The photoluminescence efficiency of the phosphors of this disclosure exhibit strong dependence on the III-V substitution concentration, x, having highest efficiency for the approximate range of x=0.25% to 1.5%.