Highly Emissive Blue Quantum Dots with Superior Thermal Stability via In Situ Surface Reconstruction of Mixed CsPbBr₃ -Cs₄ PbBr₆ Nanocrystals.

ABSTRACT: Although metal halide perovskites are candidate high-performance light-emitting diode (LED) materials, blue perovskite LEDs are problematic: mixed-halide materials are susceptible to phase segregation and bromide-based perovskite quantum dots (QDs) have low stability. Herein, a novel strategy for highly efficient, stable cesium lead bromide (CsPbBr₃ ) QDs via in situ surface reconstruction of CsPbBr₃ -Cs₄ PbBr₆ nanocrystals (NCs) is reported. By controlling precursor reactivity, the ratio of CsPbBr₃ to Cs₄ PbBr₆ NCs is successfully modulated. A high photoluminescence quantum yield (PLQY) of >90% at 470 nm is obtained because octahedron CsPbBr₃ QD surface defects are removed by the Cs₄ PbBr

SUBMITTER: Kim H 

PROVIDER: S-EPMC8844471 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature