title: Dendron engineering in self-host blue iridium dendrimers towards low-voltage-driving and power-efficient nondoped electrophosphorescent devices.
abstract: Dendron engineering in self-host blue Ir dendrimers is reported to develop power-efficient nondoped electrophosphorescent devices for the first time, which can be operated at low voltage close to the theoretical limit (Eg/e: corresponding to the optical bandgap divided by the electron charge). With increasing dendron's HOMO energy levels from B-POCz to B-CzCz and B-CzTA, effective hole injection is favored to promote exciton formation, resulting in a significant reduction of driving voltage and improvement of power efficiency. Consequently, the nondoped device of B-CzTA achieves extremely low driving voltages of 2.7/3.4/4.4 V and record high power efficiencies of 30.3/24.4/16.3 lm W-1at 1, 100 and 1000 cd m-2, respectively. We believe that this work will pave the way to the design of novel power-efficient self-host blue phosphorescent dendrimers used for energy-saving displays and solid-state lightings.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. junqiaod@ciac.ac.cn lixiang@ciac.ac.cn and University of the Chinese Academy of Sciences, Beijing 100049, P. R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. junqiaod@ciac.ac.cn lixiang@ciac.ac.cn and University of the Chinese Academy of Sciences, Beijing 100049, P. R. China.
authors.forename: Shumeng
authors.initials: S
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. junqiaod@ciac.ac.cn lixiang@ciac.ac.cn.
authors.forename: Junqiao
authors.initials: J
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. junqiaod@ciac.ac.cn lixiang@ciac.ac.cn.
authors.forename: Lixiang
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. junqiaod@ciac.ac.cn lixiang@ciac.ac.cn.
authors.forename: Xiabin
authors.initials: X
authors.lastname: Jing
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. junqiaod@ciac.ac.cn lixiang@ciac.ac.cn.
authors.forename: Fosong
authors.initials: F
authors.lastname: Wang