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:
Jul. 03, 2001
Filed:
Apr. 13, 1998
Applicant:
Inventors:
Akira Kato, Kariya, JP;
Masayuki Katayama, Handa, JP;
Nobuei Ito, Chiryu, JP;
Tadashi Hattori, Okazaki, JP;
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C 1/434 ;
U.S. Cl.
CPC ...
C23C 1/434 ;
Abstract
Disclosed is a method of producing an electroluminescent (EL) device having a CaGa,S,:Ce luminescent layer. The ratio of the X-ray diffraction peak intensity I,for the (200) reflection of CaS to the X-ray diffraction peak intensity I,for the (400) reflection of CaGa,S,as appearing in the X-ray diffraction spectrum for the luminescent layer, I,/I,, is 0.1 or less. The amount of the impurity CaS in the luminescent layer is reduced. The EL device produces blue emission with high purity.