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백승석,변성용,이준엽,황석호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Bipolar host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs) were synthesized with a linkage between 4-position of carbazole and 6-position of carboline moiety. All materials synthesized using the carbazole and carboline showed high triplet energy above 2.88 eV. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the host materials with benzonitrile, benzene, dibenzothiophene and diphenyltriazine substituents were -6.06/-2.89, -6.04/-2.78, -6.15/-2.73 and -6.09/-3.35 eV, respectively. Maximum quantum efficiency of the host materials were 18.16, 16.65, 17.85, 13.49 %, respectively.