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:
Jul. 14, 2009
Filed:
Mar. 27, 2006
Yoshitaka Kitamura, Kanagawa, JP;
Masayuki Mishima, Kanagawa, JP;
Yoshitaka Kitamura, Kanagawa, JP;
Masayuki Mishima, Kanagawa, JP;
Fujifilm Corporation, Tokyo, JP;
Abstract
The invention discloses an organic electroluminescent device having an anode, a cathode and a plurality of organic compound layers provided between the anode and the cathode and including a light-emitting layer, wherein the light-emitting layer contains two light-emitting materials including a phosphorescent light-emitting material, and a host material; and when three or more organic compound layers are provided between the light-emitting layer and the anode, and when the ionization potential of the light-emitting layer is Ipand the ionization potentials of the three or more organic compound layers are Ip, Ip, . . . , and Ipn in the order starting from the light-emitting layer, the formula (1): Ip>Ip>Ip> . . . >Ipn (n is an integer of 4 or more) is satisfied, or when three or more organic compound layers are provided between the light-emitting layer and the cathode, and when the electron affinity of the light-emitting layer is Eaand the electron affinities of the three or more organic compound layers are Ea, Ea, . . . , and Eam in the order starting from the light-emitting layer, the formula (2): Ea<Ea<Ea. . . <Eam (m is an integer of 4 or more) is satisfied.