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. 25, 2013
Filed:
Mar. 28, 2008
Shigehiro Ueno, Tokyo, JP;
Masato Okada, Tokyo, JP;
Shigehiro Ueno, Tokyo, JP;
Masato Okada, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
An organic EL device includes an organic luminescent layer between an anode and a cathode. The organic luminescent layer comprises at least two host materials and a dopant which is a luminescent compound. The at least two host materials are identical to or substantially identical to each other in the energy value of LUMO, but on the other hand, are different from each other in the energy value of HOMO. Alternatively, the at least two host materials are identical to or substantially identical to each other in the energy value of HOMO, but on the other hand, are different from each other in the energy value of LUMO. According to the above constitution, the balance of mobility between the electrons and holes can be regulated to solve the above problem of the prior art.