title: Simple structured hybrid WOLEDs based on incomplete energy transfer mechanism: from blue exciplex to orange dopant.
abstract: Exciplex is well known as a charge transfer state formed between electron-donating and electron-accepting molecules. However, exciplex based organic light emitting diodes (OLED) often performed low efficiencies relative to pure phosphorescent OLED and could hardly be used to construct white OLED (WOLED). In this work, a new mechanism is developed to realize efficient WOLED with extremely simple structure by redistributing the energy of triplet exciplex to both singlet exciplex and the orange dopant. The micro process of energy transfer could be directly examined by detailed photoluminescence decay measurement and time resolved photoluminescence analysis. This strategy overcomes the low reverse intersystem crossing efficiency of blue exciplex and complicated device structure of traditional WOLED, enables us to achieve efficient hybrid WOLEDs. Based on this mechanism, we have successfully constructed both exciplex-fluorescence and exciplex-phosphorescence hybrid WOLEDs with remarkable efficiencies.
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Tianyou
authors.initials: T
authors.lastname: Zhang
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China.
authors.forename: Bei
authors.initials: B
authors.lastname: Chu
authors.affiliation: State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China.
authors.forename: Wenlian
authors.initials: W
authors.lastname: Li
authors.affiliation: State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China.
authors.forename: Zisheng
authors.initials: Z
authors.lastname: Su
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Xingwu
authors.initials: X
authors.lastname: Yan
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Chengyuan
authors.initials: C
authors.lastname: Liu
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Hairuo
authors.initials: H
authors.lastname: Wu
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Fangming
authors.initials: F
authors.lastname: Jin
authors.affiliation: 1] State Key Laboratory of Luminescence and application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888-Dong NanHu Road, Changchun 130033, P. R. China [2] Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China.
authors.forename: Fuhua
authors.initials: F
authors.lastname: Hou