Intermittency of CsPbBr 3 Perovskite Quantum Dots Analyzed by an Unbiased Statistical Analysis.

Autor: Palstra IM; Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands., de Buy Wenniger IM; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands., Patra BK; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands., Garnett EC; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands., Koenderink AF; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
Jazyk: angličtina
Zdroj: The journal of physical chemistry. C, Nanomaterials and interfaces [J Phys Chem C Nanomater Interfaces] 2021 Jun 10; Vol. 125 (22), pp. 12061-12072. Date of Electronic Publication: 2021 May 20.
DOI: 10.1021/acs.jpcc.1c01671
Abstrakt: We analyze intermittency in intensity and fluorescence lifetime of CsPbBr 3 perovskite quantum dots by applying unbiased Bayesian inference analysis methods. We apply change-point analysis (CPA) and a Bayesian state clustering algorithm to determine the timing of switching events and the number of states between which switching occurs in a statistically unbiased manner, which we have benchmarked particularly to apply to highly multistate emitters. We conclude that perovskite quantum dots display a plethora of gray states in which brightness, broadly speaking, correlates inversely with decay rate, confirming the multiple recombination centers model. We leverage the CPA partitioning analysis to examine aging and memory effects. We find that dots tend to return to the bright state before jumping to a dim state and that when choosing a dim state, they tend to explore the entire set of states available.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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