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Hybrid Perovskite Light‐Emitting Diodes Based on Perovskite Nanocrystals with Organic–Inorganic Mixed Cations
Author(s) -
Zhang Xiaoli,
Liu He,
Wang Weigao,
Zhang Jinbao,
Xu Bing,
Karen Ke Lin,
Zheng Yuanjin,
Liu Sheng,
Chen Shuming,
Wang Kai,
Sun Xiao Wei
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201606405
Subject(s) - perovskite (structure) , light emitting diode , materials science , energy conversion efficiency , nanocrystal , diode , photovoltaics , chemical engineering , optoelectronics , nanotechnology , photovoltaic system , ecology , engineering , biology
Organic–inorganic hybrid perovskite materials with mixed cations have demonstrated tremendous advances in photovoltaics recently, by showing a significant enhancement of power conversion efficiency and improved perovskite stability. Inspired by this development, this study presents the facile synthesis of mixed‐cation perovskite nanocrystals based on FA (1− x ) Cs x PbBr 3 (FA = CH(NH 2 ) 2 ). By detailed characterization of their morphological, optical, and physicochemical properties, it is found that the emission property of the perovskite, FA (1− x ) Cs x PbBr 3 , is significantly dependent on the substitution content of the Cs cations in the perovskite composition. These mixed‐cation perovskites are employed as light emitters in light‐emitting diodes (LEDs). With an optimized composition of FA 0.8 Cs 0.2 PbBr 3 , the LEDs exhibit encouraging performance with a highest reported luminance of 55 005 cd m −2 and a current efficiency of 10.09 cd A −1 . This work provides important instructions on the future compositional optimization of mixed‐cation perovskite for obtaining high‐performance LEDs. The authors believe this work is a new milestone in the development of bright and efficient perovskite LEDs.