title: Above 30% external quantum efficiency in blue phosphorescent organic light-emitting diodes using pyrido[2,3-b]indole derivatives as host materials.
abstract: High quantum efficiencies of above 30% in blue phosphorescent organic light emitting diodes are achieved by using novel pyridoindole-based bipolar host materials. A high quantum efficiency of 30.0% is obtained at 100 cd/m(2) by using the new host materials.
authors.affiliation: Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701, Republic of Korea.
authors.forename: Chil Won
authors.initials: CW
authors.lastname: Lee
authors.forename: Jun Yeob
authors.initials: JY
authors.lastname: Lee
keywords: pyridoindole·triplet host material·high triplet energy·high quantum efficiency·blue device