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:
Aug. 11, 1998
Filed:
Feb. 08, 1995
Kenji Nakaya, Chiba, JP;
Tetsushi Inoue, Chiba, JP;
TDK Corporation, Tokyo, JP;
Abstract
Tetraaryldiamie derivatives of formula (1) are used in organic EL elements. ##STR1## R.sub.1, R.sub.2, R.sub.3, and R.sub.4 represent aryl, alkyl, alkoxy, aryloxy, amino or halogen, at least one of R.sub.1 to R.sub.4 is an, aryl group, r1, r2, r3, and r4 are 0 or an integer of 1 to 5, the sum of r1 to r4 is at least 1, R.sub.5 and R.sub.6 represent alkyl, alkoxy, amino or halogen, r5 and r6 are 0 or an integer of 1 to 4. The inventive compounds have high m.p. and high Tg and can be evaporated to deposit tranparent smooth thin films of quality which maintain a stable amorphous state are room temperature over a long term. Organic EL elements using the invertive compound in an organic compound layer, typically a hole injecting and transporting layer thereof provide uniform plane light emission and maintain a high intensity of luminescence in a stable manner over a long term. Thus the elements are fully durable and reliable.