为重庆大学设计的Adv. Sci.杂志封面，The further practical applications of halide perovskite quantum dots (QDs) are blocked by problems of instability and non-radiative Auger recombination manifested as photoluminescence blinking. Here, for the first time, we successfully fabricated single core/shell structured perovskite semiconductor QDs by capping CsPbBr 3 QD core with CdS shell. We demonstrate 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 non-radiative 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.
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