title: Peripheral cyanohexyl substituent in wide bandgap polymer: increase the electron injection property for blue phosphorescence light emitting device.
abstract: Novel blue phosphor host, PCNCzSi, using 3,6-linked carbazole with δ-π tetraphenylsilane segment as the main chain modified by peripheral cyanohexyl group was designed. The Si-carbazole backbone entitles the polymer with wide bandgap, high E(T) and good hole transporting ability. The introduction of peripheral CN group with high electron affinity enhances the electron injecting property of the polymer revealed by electron-only device and UPS measurement. Highly efficient spin-coated phosphorescent polymer light-emitting device, using PCNCzSi as the host for blue iridium complex, FIrpic, was realized. The maximum luminous efficiency and maximum external quantum efficiency of the device were 15 cd/A and 6.7%, respectively, which are very high values for blue phosphorescent device using polymers as hosts as known.
authors: State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, People's Republic of China. ygma@jlu.edu.cn
authors: Dehua
authors: D
authors: Hu
authors: Gang
authors: G
authors: Cheng
authors: Ping
authors: P
authors: Lu
authors: He
authors: H
authors: Liu
authors: Fangzhong
authors: F
authors: Shen
authors: Fenghong
authors: F
authors: Li
authors: Ying
authors: Y
authors: Lv
authors: Wenyue
authors: W
authors: Dong
authors: Yuguang
authors: Y
authors: Ma
mesh_terms: D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation*; D015394:Molecular Structure; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D011108:Polymers