Dipolar asymmetry of carbazole based host material of guest over host organic light-emitting device system of the electronic phosphorescent (electrophosphorescent)

摘要

PROBLEM TO BE SOLVED: To provide an improved organic light emitting device with bipolar carbazole or its derivative used as a host material in a guest-host system.;SOLUTION: In the organic light emitting device (OLED), the bipolar carbazole-group material following a general formula (I) is used as a host material in a guest-host layer such as a light emitting layer and/or one electron transferring layer. In the formula, R₁ expresses an electron feeding part or an electron receiving part, each of R₂-R₇ exists arbitrarily, and each of the R₂-R₇ independently expresses an electron feeding part or an electron receiving part.;COPYRIGHT: (C)2005,JPO&NCIPI