文章基本信息

标题：Long-living nonlinear behavior in CsPbBr3 carrier recombination dynamics
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作者：Fabio Gabelloni ; Francesco Biccari ; Naomi Falsini 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2019
卷号：8
期号：9
页码：1447-1455
DOI：10.1515/nanoph-2019-0013
出版社：Walter de Gruyter GmbH
摘要：By means of time-resolved photoluminescence (TR-PL) spectroscopy, we present a detailed investigation of the carrier relaxation dynamics in a CsPbBr 3 bulk sample and microcrystal ensemble at cryogenic temperature on a picosecond time scale. We provide evidence of a long temperature-dependent cooling rate for the excitons and free carriers population, with an initial cooling time constant of a few tens of picoseconds. A relaxation bottleneck in the thermalization process was found that cannot be explained by the Auger effect or hot phonon population, since we address a very low excitation regime, not commonly investigated in literature, where such processes are not effective. Adding a continuous wave optical bias to the picosecond excitation, we probed the photoinduced PL decrease of the localized states and the photoinduced PL increase of the population in the high energy states. A long recovery time from the photoinduced PL decrease was found for localized states and quite significant differences were detected, depending on the resonance/off resonance bias used in the experiment..
关键词：inorganic perovskites ; CsPbBr3 ; time;resolved optical spectroscopy ; excitons ; thermalization ; non;linearity