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:
May. 24, 2011
Filed:
Jan. 21, 2009
Koji Yasukawa, Suwa, JP;
Masayuki Mitsuya, Chino, JP;
Koji Yasukawa, Suwa, JP;
Masayuki Mitsuya, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A light-emitting element includes a cathode, an anode, a first light-emitting layer disposed between the cathode and the anode, a second light-emitting layer disposed between the first light-emitting layer and the cathode, a third light-emitting layer disposed between the second light-emitting layer and the cathode, a first interlayer disposed between the first and second light-emitting layers that has a function of preventing energy transfer of an exciton between the first and second light-emitting layers, and a second interlayer disposed between the second and third light-emitting layers that has a function of preventing energy transfer of an exciton between the second and third light-emitting layers, wherein the first interlayer has a hole-transporting property higher than that of the second interlayer, and the second interlayer has a electron-transporting property higher than that of the first interlayer.