期刊
MATERIALS & DESIGN
卷 185, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2019.108246
关键词
Room-temperature synthesis; CsPb1-xSnxBr3 perovskite quantum dots; High quantum yield; Outstanding stability; Light-emitting diodes
资金
- Natural Science Foundation of China [91741105, 21173169]
- Chongqing Municipal Natural Science Foundation [cstc2018jcyjAX0625]
- program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
The traditional hot injection (HI) process needs high temperature, inert gas protection, and localized injection operation, which severely hinder their large-scale industrialization. Moreover, the CsPb1-xSnxBr3 HI-QDs exhibit poor stability. Herein, we report the room-temperature (RT) synthesis of CsPb1-xSnxBr3 perovskite QDs by modified ligand-assisted reprecipitation (LARP) approach. Compared with the CsPb1-xSnxBr3 HI-QDs reported in literatures, the CsPb1-xSnxBr3 RT-QDs show higher photoluminescence quantum yield (PLQY) and better stability: the CsPb0.9Sn0.1Br3 RT-QDs obtain the highest PLQY of more than 91%, and the stability of the film made with this QDs still maintain more than 80% of its original fluorescence strength after 120 days in air environment. Because of the superior PLQY, light-emitting diodes (LEDs) based on the RT-QDs is constructed, and it exhibits an external quantum efficiency (EQE) of 1.8%, a luminance of 1600 cdm(-2), a current efficiency of 4.89 cdA(-1), a power efficiency of 6.41 lmw(-1), and a low on-voltage of 3.6 V. The present work provides a feasible method for large-scale industrial synthesis of perovskite QDs at room temperature and shows that the CsPb1-xSnxBr3 RT-QDs are promising for highly efficient LEDs. (C) 2019 The Authors. Published by Elsevier Ltd.
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