Patent ID: 8779655
Filing Date: 2014-07-15
Classification: C09K,H01L,H05B

Abstract:
1. An organic electroluminescence device, comprising: a cathode; an anode; and a single-layered or multilayered organic thin-film layer provided between the cathode and the anode, wherein the organic thin-film layer comprises at least one emitting layer, and the at least one emitting layer comprises: at least one phosphorescent material; and a host material having excited triplet energy of of 2.0 eV to 2.8 eV, the host material represented by a formula (1) as follows, where: Ar Ra and Rb each represent a substituted or unsubstituted benzene ring or a condensed aromatic hydrocarbon ring selected from a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted chrysene ring, a substituted or unsubstituted fluoranthene ring, a substituted or unsubstituted phenanthrene ring, a substituted or unsubstituted benzophenanthrene ring, a substituted or unsubstituted dibenzophenanthrene ring, a substituted or unsubstituted benzochrysene ring, and a substituted or unsubstituted picene ring, wherein the substituents for Ra and Rb are not aryl groups, wherein when Ra, Rb, or both are substituted with a substituent, the substituent is one or more of an alkyl group comprising 1 to 20 carbon atoms, a haloalkyl group comprising 1 to 20 carbon atoms, a cycloalkyl group comprising 5 to 18 carbon atoms, a silyl group comprising 3 to 20 carbon atoms, a cyano group, and a halogen atom, wherein when Ar