title: Highly efficient white polymer light-emitting devices based on wide bandgap polymer doped with blue and yellow phosphorescent dyes.
abstract: We realize high luminous efficiency (LE) in white polymer light-emitting devices by employing a wide bandgap polymer P36HCTPSi as host and introducing a blue-yellow two-color system for obtaining white emission. Phosphorescent dopants bis[(4,6-difluorophenyl)pyridinato-N,C(2)]-(picolinato)iridium(III) (FIrpic) and iridium(III) bis(2-(9,9'-spirobi[fluorene]-7-yl)pyridine-N,C(2')) acetylacetonate [Ir(SBFP)(2) (acac)] were used as blue and yellow emitters, respectively. Electroluminescent spectra and LE were both affected by Ir(SBFP)(2)(acac) concentration; the device with low concentration (0.4 wt.%) showed white emission with a LE of 24.1 cd/A at 1000 cd/m(2), while the one with high concentration (4 wt.%) emitted yellowish-white light with a higher LE of 47.3 cd/A at 1000 cd/m(2).
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. chenggang@jlu.edu.cn
authors.forename: Gang
authors.initials: G
authors.lastname: Cheng
authors.forename: Teng
authors.initials: T
authors.lastname: Fei
authors.forename: Yu
authors.initials: Y
authors.lastname: Duan
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yuguang
authors.initials: Y
authors.lastname: Ma
authors.forename: Shiyong
authors.initials: S
authors.lastname: Liu