Single Halide Perovskite/Semiconductor Core/Shell Quantum Dots with Ultrastability and Nonblinking Properties.

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 Aug

SUBMITTER: Tang X 

PROVIDER: S-EPMC6755528 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature