title: Ideal bipolar host materials with bis-benzimidazole unit for highly efficient solution-processed green electrophosphorescent devices.
abstract: An ideal host material with high triplet energy, suitable HOMO energy level, excellent thermal and electrochemical stability, and bipolar charge carrier transport ability was synthesized. A high external quantum efficiency of 13.7% and a luminance efficiency of 48.2 cd A(-1) with low efficiency roll-off were achieved in solution-processed green electrophosphorescent devices.
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Jiang
authors.forename: Jinan
authors.initials: J
authors.lastname: Tang
authors.forename: Xinxin
authors.initials: X
authors.lastname: Ban
authors.forename: Yueming
authors.initials: Y
authors.lastname: Sun
authors.forename: Lian
authors.initials: L
authors.lastname: Duan
authors.forename: Yong
authors.initials: Y
authors.lastname: Qiu