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. 10, 2015
Filed:
Mar. 09, 2012
Yoshikazu Kuzuoka, Osaka, JP;
Hiroya Tsuji, Kyoto, JP;
Hiroyuki Sasaki, Osaka, JP;
Satoshi Ohara, Osaka, JP;
Kazuyuki Yamae, Nara, JP;
Yoshikazu Kuzuoka, Osaka, JP;
Hiroya Tsuji, Kyoto, JP;
Hiroyuki Sasaki, Osaka, JP;
Satoshi Ohara, Osaka, JP;
Kazuyuki Yamae, Nara, JP;
Abstract
A white light-emitting organic electroluminescent element includes at least four kinds of light-emitting dopants with different emission peak wavelengths which are present between a cathode and an anode. The four kinds of light-emitting dopants include a light-emitting dopant 'A', a light-emitting dopant 'B', a light-emitting dopant “C”, and a light-emitting dopant “D” having their own peak wavelengths which are longer in this order. The white light-emitting organic electroluminescent element has an emission spectrum which satisfies relations of: (first average luminance for an angle in a range of 50° to 70°/first front luminance)>(second average luminance for an angle in a range of 50° to 70°/second front luminance); and (third average luminance for an angle in a range of 50° to 70°/third front luminance)>(fourth average luminance for an angle in a range of 50° to 70°/fourth front luminance).