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. 01, 2014
Filed:
Jan. 11, 2010
Kenichi Fukuoka, Sodegaura, JP;
Masahide Matsuura, Sodegaura, JP;
Hiroshi Yamamoto, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Kenichi Fukuoka, Sodegaura, JP;
Masahide Matsuura, Sodegaura, JP;
Hiroshi Yamamoto, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
An organic electroluminescence element comprising: an anode; a first emitting layer comprising at least a first host material and a first dopant; a second emitting layer comprising at least a second host material and a second dopant; and a cathode in the order mentioned: wherein the energy gap Eof the first host material, the energy gap Eof the first dopant, the energy gap Eof the second host material, and the energy gap Eof the second dopant satisfy the following formulas; and the luminescent intensity Iat the maximum luminescent wavelength of an emission spectrum derived from the first emitting layer, and the luminescent intensity Iat the maximum luminescent wavelength of an emission spectrum derived from the second emitting layer satisfy the following formula:E1>E1E2>E2E1>E21>3.5×2.