Suppressing thermal quenching of lead halide perovskite nanocrystals by constructing a wide-bandgap surface layer for achieving thermally stable white light-emitting diodes.

ABSTRACT: Lead halide perovskite nanocrystals as promising ultrapure emitters are outstanding candidates for next-generation light-emitting diodes (LEDs) and display applications, but the thermal quenching behavior of light emission has severely hampered their real-world applications. Here, we report an anion passivation strategy to suppress the emission thermal quenching behavior of CsPbBr₃ perovskite nanocrystals. By treating with specific anions (such as SO₄ ^2-, OH^-, and F^- ions), the corresponding wide-bandgap passivation layers, PbSO₄, Pb(OH)₂, and PbF₂, were obtained. They not only repair the surface defects of CsPbBr₃ nanocrystals but also stabilize the phase structure of the inner CsPbBr_3<

SUBMITTER: Zhang Q 

PROVIDER: S-EPMC8966659 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature