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:
Jun. 26, 2012
Filed:
Mar. 24, 2008
Kazuki Nishimura, Sodegaura, JP;
Toshihiro Iwakuma, Sodegaura, JP;
Kenichi Fukuoka, Sodegaura, JP;
Yukitoshi Jinde, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Kazuki Nishimura, Sodegaura, JP;
Toshihiro Iwakuma, Sodegaura, JP;
Kenichi Fukuoka, Sodegaura, JP;
Yukitoshi Jinde, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
A phosphorescent-emitting layer contains a phosphorescent host and a phosphorescent dopant for providing phosphorescence, and a fluorescent-emitting layer contains a fluorescent host and a fluorescent dopant for providing fluorescence. A charge blocking layer blocks electrons injected into the fluorescent host of the fluorescent-emitting layer from being injected toward the charge blocking layer from the fluorescent-emitting layer, and also injects holes into the fluorescent-emitting layer from the phosphorescent-emitting layer. A triplet energy gap Egof the phosphorescent dopant of the phosphorescent-emitting layer, a triplet energy gap Egof the charge blocking layer and a triplet energy gap Egof the fluorescent host of the fluorescent-emitting layer satisfy the following formula (1).Eg<Eg≦Eg  (1)