title: Highly Efficient Perovskite Light-Emitting Diodes Incorporating Full Film Coverage and Bipolar Charge Injection.
abstract: Solution-processable organometal halide perovskites have been emerging as very promising materials for light-emitting diodes (LEDs) because of their high color purity, low cost, and high photoluminescence quantum yield. However, their electroluminescent performance is still limited by incomplete surface coverage and inefficient charge injection into the perovskite. Here, we demonstrate highly efficient perovskite LEDs (PeLEDs) incorporating full film coverage and bipolar charge injection within the active layer by introducing perovskite precursor poly(9-vinylcarbazole):1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (PVK:TPBi) toluene solution into CH3NH3PbBr3N,N-dimethylformamide solution. Both the film coverage and the charge injections were simultaneously improved by antisolvent of toluene and PVK:TPBi matrix, respectively. After the film morphology and weight ratio of PVK:TPBi were carefully adjusted, the optimal PeLEDs gave efficient emission with turn-on voltage of ∼2.8 V, maximum luminance of ∼7263 cd/m2, maximum current efficiency of ∼9.45 cd/A, and maximum external quantum efficiency of ∼2.28%, which are among the best results based on MAPbBr3reported to date.
authors.affiliation: School of Physical Science and Technology, MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University , Chongqing 400715, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Chen
authors.affiliation: School of Physical Science and Technology, MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University , Chongqing 400715, China.
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Xiong
authors.affiliation: Institute of Fluid Physics, Mianyang, China Academy of Engineering Physics , Mianyang 621900, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Wu
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing Jiaotong University , Beijing 100044, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Shao
authors.affiliation: School of Physical Science and Technology, MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University , Chongqing 400715, China.
authors.forename: Xingjuan
authors.initials: X
authors.lastname: Ma
authors.affiliation: School of Physical Science and Technology, MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University , Chongqing 400715, China.
authors.forename: Zu-Hong
authors.identifier: http://orcid.org/0000-0003-4729-300X
authors.initials: ZH
authors.lastname: Xiong
authors.affiliation: School of Physical Science and Technology, MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University , Chongqing 400715, China.
authors.forename: Chunhong
authors.identifier: http://orcid.org/0000-0002-5157-3162
authors.initials: C
authors.lastname: Gao