Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion.
basic_science · Level V
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- Record sourced from PubMed, PMID 27689439.
- Also identified by DOI 10.1021/acs.nanolett.6b02874.
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Abstract
Over the last two decades, intensive research efforts have been devoted to the suppressions of photoluminescence (PL) blinking and Auger recombination in metal-chalcogenide nanocrystals (NCs), with significant progresses being made only very recently in few specific NC structures. Here we show that nonblinking PL is readily available in the newly synthesized perovskite CsPbI<sub>3</sub> NCs and that their Auger recombination of charged excitons is greatly slowed down, as signified by a PL lifetime about twice shorter than that of neutral excitons. Moreover, spectral diffusion is completely absent in single CsPbI<sub>3</sub> NCs at the cryogenic temperature, leading to a resolution-limited PL line width of ∼200 μeV.