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- W4306412380 abstract "Lead halide perovskites (LHPs) have been developed into promising materials for next-generation energy-efficient LEDs and solar cells. The LHP LED efficiency has become 45.5%, and solar cell efficiency has become 25.5%. Nevertheless, defects, including halide vacancies, adversely affect the efficiencies and stabilities of these devices. Therefore, the characteristics of such defects are important for optimizing the current-to-photon and photon-to-current conversion efficiencies of LHP LEDs and solar cells. The electroluminescence (EL) helps us to understand the carrier recombination dynamics in an LHP single-crystal LED. We report EL spectral fluctuations, intensity variations, and blinking of emitting centers in LHP single microcrystals from time- and intensity-correlated EL and PL data. Single-particle EL spectra reveal stochastically switching carrier recombination centers at different heights or positions within a MAPbBr3 microcrystal play a central role in the EL intensity, and blinking time. The ON- and OFF-time probability distributions of emitting centers in a crystal fit a truncated power law with an early ON-time cutoff, suggesting multiple charge recombination processes in blinking, such as the presence of multiple quantum dots in a crystal. The emitter-quencher correlated EL blinking in single microcrystals follows the charging–discharging (type-A) mechanism, known for strongly quantum-confined systems. Interestingly, the EL ON-time truncates, and the number of emitted photons increases by filling the halide vacancies, underscoring the importance of minimizing halide vacancies in LEDs." @default.
- W4306412380 created "2022-10-17" @default.
- W4306412380 creator A5030446424 @default.
- W4306412380 creator A5061614032 @default.
- W4306412380 creator A5073826478 @default.
- W4306412380 date "2022-10-17" @default.
- W4306412380 modified "2023-09-27" @default.
- W4306412380 title "Electroluminescence of Halide Perovskite Single Crystals Showing Stochastically Active Multiple Emitting Centers" @default.
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- W4306412380 doi "https://doi.org/10.1021/acs.jpcc.2c04069" @default.
- W4306412380 hasPublicationYear "2022" @default.