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Title: Single halide perovskite/semiconductor core/shell quantum dots with ultrastability and nonblinking properties
Authors: Tang, Xiaosheng
Yang, Jie
Li, Shiqi
Liu, Zhengzheng
Hu, Zhiping
Hao, Jiongyue
Du, Juan
Leng, Yuxin
Qin, Haiyan
Lin, Xing
Lin, Yue
Tian, Yuxi
Zhou, Miao
Xiong, Qihua
Keywords: First-principles
Core/shell Structure
Issue Date: 2019
Source: Tang, X., Yang, J., Li, S., Liu, Z., Hu, Z., Hao, J., . . . Xiong, Q. (2019). Single halide perovskite/semiconductor core/shell quantum dots with ultrastability and nonblinking properties. Advanced Science, 1900412-. doi:10.1002/advs.201900412
Series/Report no.: Advanced Science
Abstract: The further practical applications of halide perovskite quantum dots (QDs) are blocked by problems of instability and nonradiative Auger recombination manifested as photoluminescence blinking. Here, single core/shell structured perovskite semiconductor QDs are successfully fabricated by capping CsPbBr3 QD core with CdS shell. It is demonstrated that CsPbBr3/CdS core/shell QDs exhibit ultrahigh chemical stability and nonblinking photoluminescence with high quantum yield due to the reduced electronic traps within the core/shell structure. Efficiency of amplified spontaneous emission exhibits obvious enhancement compared to that of pure CsPbBr3 QDs, originating from the mitigated competition between stimulated emission and suppressed nonradiative biexciton Auger recombination. Furthermore, low‐threshold whispering‐gallery‐mode lasing with a high‐quality factor is achieved by incorporating CsPbBr3/CdS QDs into microtubule resonators. Density functional theory (DFT)‐based first‐principles calculations are also performed to reveal the atomic interface structure, which supports the existence of CsPbBr3/CdS structure. An interesting feature of spatially separated charge density at CsPbBr3/CdS interface is found, which may greatly contribute to the suppressed Auger recombination. The results provide a practical approach to improve the stability and suppress the blinking of halide perovskite QDs, which may pave the way for future applications for various optoelectronic devices.
DOI: 10.1002/advs.201900412
Rights: © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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