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:
Mar. 21, 2017
Filed:
Dec. 17, 2014
Applicant:
Nitto Denko Corporation, Ibaraki, Osaka, JP;
Inventor:
Liping Ma, San Diego, CA (US);
Assignee:
NITTO DENKO CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 29/08 (2006.01); H01L 33/00 (2010.01); H01L 21/31 (2006.01); H01J 1/62 (2006.01); H01L 51/50 (2006.01); H01L 51/00 (2006.01);
U.S. Cl.
CPC ...
H01L 51/504 (2013.01); H01L 51/0085 (2013.01); H01L 51/5016 (2013.01); H01L 51/5036 (2013.01); H01L 51/0037 (2013.01); H01L 51/0059 (2013.01); H01L 51/0062 (2013.01); H01L 51/0067 (2013.01); H01L 51/0094 (2013.01); H01L 51/5056 (2013.01); H01L 51/5072 (2013.01); H01L 2251/552 (2013.01);
Abstract
Generally, the devices provided herein comprise at least a hole-transport layer, two light-emitting layers, and an electron-transport layer, each having a highest occupied molecular orbital (HOMO) energy level and a lowest unoccupied molecular orbital (LUMO) energy level, wherein at least one of the HOMO energy levels and/or the LUMO energy levels of at least one of the light-emitting layers does not decrease in a stepwise fashion.