title: Silicon-based material with spiro-annulated fluorene/triphenylamine as host and exciton-blocking layer for blue electrophosphorescent devices.
abstract: A novel silicon-based compound, 10-phenyl-2'-(triphenylsilyl)-10H-spiro[acridine-9,9'-fluorene] (SSTF), with spiro structure has been designed, synthesized, and characterized. Its thermal, electronic absorption, and photoluminescence properties were studied. Its energy levels make it suitable as a host material or exciton-blocking material in blue phosphorescent organic light-emitting diodes (PhOLEDs). Accordingly, blue-emitting devices with iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C(2)']picolinate (FIrpic) as phosphorescent dopant have been fabricated and show high efficiency with low roll-off. In particular, 44.0 cd A(-1) (41.3 lm W(-1)) at 100 cd m(-2) and 41.9 cd A(-1) (32.9 lm W(-1)) at 1000 cd m(-2) were achieved when SSTF was used as host material; 28.1 lm W(-1) at 100 cd m(-2) and 20.6 lm W(-1) at 1000 cd m(-2) were achieved when SSTF was used as exciton-blocking layer. All of the results are superior to those of the reference devices and show the potential applicability and versatility of SSTF in blue PhOLEDs.
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Soochow University, Suzhou 215123, PR China.
authors.forename: Hua
authors.initials: H
authors.lastname: Chen
authors.forename: Zuo-Quan
authors.initials: ZQ
authors.lastname: Jiang
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Gao
authors.forename: Mei-Feng
authors.initials: MF
authors.lastname: Xu
authors.forename: Shou-Cheng
authors.initials: SC
authors.lastname: Dong
authors.forename: Lin-Song
authors.initials: LS
authors.lastname: Cui
authors.forename: Shun-Jun
authors.initials: SJ
authors.lastname: Ji
authors.forename: Liang-Sheng
authors.initials: LS
authors.lastname: Liao
keywords: electrophosphorescence; host-guest systems; luminescence; organic light-emitting diodes; spiro compounds