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:
Apr. 14, 1992
Filed:
May. 23, 1990
Yoshiharu Sato, Sagamihara, JP;
Masayuki Yajima, Yokohama, JP;
Tetsuo Murayama, Tokyo, JP;
Hitoshi Ono, Yokohama, JP;
Mitsubishi Kasei Corporation, Tokyo, JP;
Abstract
An organic electroluminescent device having an organic hole injection transport layer and an organic luminescent layer formed between two conductive layers constituting electrodes, wherein the organic hole injection transfer layer contains a hydrazone compound of the following formula (I): ##STR1## wherein A is a monovalent or bivalent organic group containing at least one aromatic hydrocarbon ring or aromatic hetero ring which may have a substituent, each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is a hydrogen atom, or an alkyl, aralkyl, aromatic hydrocarbon or heterocyclic group which may have a substitutent, each of R.sup.6 and R.sup.7 is an alkyl, aralkyl, aryl, aromatic hydrocarbon or heterocyclic group which may have a substituent, l is an integer of 0 or 1, m is an integer of 0, 1 or 2, and n is an integer of 1 or 2, provided that A, R.sup.1 and the carbon atom to which R.sup.1 is bonded, or R.sup.6, R.sup.7 and the nitrogen atom to which R.sup.6 and R.sup.7 are bonded, may bond to one another to form a ring.