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:
Oct. 31, 1989
Filed:
Mar. 23, 1988
Moriaki Fuyama, Tokyo, JP;
Katsumi Tamura, Tokyo, JP;
Kazuo Taguchi, Tokyo, JP;
Kenichi Onisawa, Hitachi, JP;
Akira Sato, Takahagi, JP;
Kenichi Hashimoto, Katsuta, JP;
Takahiro Nakayama, Hitachi, JP;
Yoshio Abe, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electroluminescent device comprising an electroluminescent layer capable of emitting light under application of AC voltage, the electroluminescent layer comprising strontium sulfide as a matrix and containing at least one of halides and sulfides of cerium, europium, thulium, terbium and samarium, and having a lattice constant of not more than 6.04 .ANG. and a half-width value at the (111) face of not more than 0.21 degree has a higher brightness than an electroluminescent device having an electroluminescent layer comprising ZnS as a matrix.