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. 04, 2008
Filed:
Apr. 23, 2002
Makoto Satsuki, Okayama, JP;
Natsuko Ishida, Okayama, JP;
Sadaharu Suga, Okayama, JP;
Hisayoshi Fujikawa, Aichi, JP;
Yasunori Taga, Aichi, JP;
Satoshi Nakagawa, Aichi, JP;
Takanori Murasaki, Aichi, JP;
Yoshifumi Kato, Aichi, JP;
Makoto Satsuki, Okayama, JP;
Natsuko Ishida, Okayama, JP;
Sadaharu Suga, Okayama, JP;
Hisayoshi Fujikawa, Aichi, JP;
Yasunori Taga, Aichi, JP;
Satoshi Nakagawa, Aichi, JP;
Takanori Murasaki, Aichi, JP;
Yoshifumi Kato, Aichi, JP;
Kabushiki Kaisha Toyota Jidoshokki, Aichi, JP;
Abstract
An organic electroluminescent (EL) device which uses, as a luminescence-assisting agent, a novel coumarin derivative with a specific structure. The coumarin derivative effectively accelerates in such an organic EL device the transfer of excited energy in a host compound to a guest compound. Thus, the coumarin derivative affords the organic EL device which is superior in a color purity, luminescent efficiency and life expectancy when used in combination with appropriate host and guest compounds.