Open AccessSingle Halide Perovskite/Semiconductor Core/Shell Quantum Dots with Ultrastability and Nonblinking Properties
Author(s) -
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
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201900412
Subject(s) - perovskite (structure) , quantum dot , auger effect , photoluminescence , materials science , formamidinium , optoelectronics , semiconductor , biexciton , density functional theory , lasing threshold , spontaneous emission , nanotechnology , auger , chemistry , atomic physics , physics , crystallography , optics , laser , computational chemistry , wavelength
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 CsPbBr 3 QD core with CdS shell. It is demonstrated that CsPbBr 3 /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 CsPbBr 3 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 CsPbBr 3 /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 CsPbBr 3 /CdS structure. An interesting feature of spatially separated charge density at CsPbBr 3 /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.