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. 10, 2016
Filed:
Nov. 28, 2011
Junya Ogawa, Kitakyushu, JP;
Takahiro Kai, Kitakyushu, JP;
Megumi Matsumoto, Kitakyushu, JP;
NIPPON STEEL & SUMKIN CHEMICAL CO., LTD., Tokyo, JP;
Abstract
Provided is an organic electroluminescent device (organic EL device) which exhibits improved luminous efficiency, ensures sufficient driving stability, and has a simple configuration. The organic electroluminescent element includes an anode, a plurality of organic layers, and a cathode laminated on a substrate, and contains a carbazole compound represented by the general formula (1) in at least one layer selected from the group consisting of a emitting layer, a hole-transporting layer, and an electron-blocking layer. In general formula (1), L represents an m-valent aromatic hydrocarbon group or aromatic heterocyclic group, R's each represent hydrogen, an alkyl group, or a cycloalkyl group, m represents an integer of 1 to 3, and n's each represent an integer of 1 to 4, provided that at least one n represents an integer of 2 to 4, and at least one specific structure represented by the formula (1a) is present in the formula.