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:
Sep. 24, 1991
Filed:
Nov. 23, 1990
Applicant:
Inventors:
Hitoshi Toki, Mobara, JP;
Yoshitaka Satoh, Mobara, JP;
Assignee:
Futaba Denshi Kogya K.K., Mobara, JP;
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
2523 / ; 2523 / ;
Abstract
A phosphor producing process capable of providing a phosphor of good quality in a reduced period of time. A Li compound acting as a doping agent is added prior to primary calcination so that it may also act as a flux and removed by washing prior to secondary calcination. A ZnO.Ga.sub.2 O.sub.3 solid solution thus obtained is activated in the secondary calcination using an atmosphere in which reducing gas and Zn gas are mixed. Thus, a ZnO.Ga.sub.2 O.sub.3 :Li, P phosphor is which the molar ratio between Zn and Ga.sub.2 O.sub.3 is 1:1 and of which crystals exhibit good surface conditions can be produced in a reduced period of time.