| Literature DB >> 30741555 |
Xinyu Shen, Yu Zhang, Stephen V Kershaw1, Tianshu Li, Congcong Wang, Xiaoyu Zhang, Wenyan Wang, Daguang Li, Yinghui Wang, Min Lu, Lijun Zhang, Chun Sun, Dan Zhao, Guanshi Qin, Xue Bai, William W Yu2, Andrey L Rogach1,3.
Abstract
We alloyed Zn2+ into CsPbI3 perovskite nanocrystals by partial substitution of Pb2+ with Zn2+, which does not change their crystalline phase. The resulting alloyed CsPb0.64Zn0.36I3 nanocrystals exhibited an improved, close-to-unity photoluminescence quantum yield of 98.5% due to the increased radiative decay rate and the decreased non-radiative decay rate. They also showed an enhanced stability, which correlated with improved effective Goldschmidt tolerance factors, by the incorporation of Zn2+ ions with a smaller radius than the Pb2+ ions. Simultaneously, the nanocrystals switched from n-type (for CsPbI3) to nearly ambipolar for the alloyed nanoparticles. The hole injection barrier of electroluminescent LEDs was effectively eliminated by using alloyed CsPb0.64Zn0.36I3 nanocrystals, and a high peak external quantum efficiency of 15.1% has been achieved.Entities:
Keywords: Lead halide perovskite nanocrystals; alloying; enhanced stability; improved photoluminescence quantum yield; light-emitting devices
Year: 2019 PMID： 30741555 DOI： 10.1021/acs.nanolett.8b04339
Source DB: PubMed Journal: Nano Lett ISSN： 1530-6984 Impact factor: 11.189