Composition-Dependent Energy Splitting between Bright and Dark Excitons in Lead Halide Perovskite Nanocrystals

Nano Letters
Lan ChenMin Xiao

Abstract

Perovskite semiconductor nanocrystals with different compositions have shown promise for applications in light-emitting devices. Dark excitonic states may suppress light emission from such nanocrystals by providing an additional nonradiative recombination channel. Here, we study the composition dependence of dark exciton dynamics in nanocrystals of lead halides by time-resolved photoluminescence spectroscopy at cryogenic temperatures. The presence of a spin-related dark state is revealed by magneto-optical spectroscopy. The energy splitting between bright and dark states is found to be highly sensitive to both halide elements and organic cations, which is explained by considering the effects of size confinement and charge screening, respectively, on the exchange interaction. These findings suggest the possibility of manipulating dark exciton dynamics in perovskite semiconductor nanocrystals by composition engineering, which will be instrumental in the design of highly efficient light-emitting devices.

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Citations

Mar 30, 2018·Chemical Communications : Chem Comm·Yongbing LouYixin Zhao
Jun 11, 2019·Nanoscale·Fei Yan, Hilmi Volkan Demir
Nov 11, 2019·The Journal of Chemical Physics·Yoshihiko Kanemitsu
Dec 23, 2019·The Journal of Chemical Physics·Peter C SercelAlexander L Efros
Jun 18, 2021·ACS Nano·Amrita DeyLakshminarayana Polavarapu
Jul 10, 2021·The Journal of Chemical Physics·Buyang YuMin Xiao
Sep 11, 2018·ACS Applied Materials & Interfaces·Lin-Jer ChenChia-Rong Lee
Mar 8, 2019·The Journal of Physical Chemistry Letters·Huaiyi DingXiaoping Wang
May 16, 2019·Nano Letters·Peter C SercelAlexander L Efros
Feb 28, 2019·The Journal of Physical Chemistry Letters·Wei ZhaoMin Xiao
Apr 11, 2020·The Journal of Physical Chemistry Letters·Feng JiangAnlian Pan
Aug 25, 2021·Nano Letters·Yubin FanShumin Xiao
Jan 15, 2020·The Journal of Physical Chemistry Letters·R Ben AichC Testelin
Apr 14, 2020·Nano Letters·Oskar SchusterDaniel Niesner
Mar 16, 2019·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Kunyuan XuAndries Meijerink
Aug 1, 2019·The Journal of Physical Chemistry Letters·Satoshi NakaharaYoshihiko Kanemitsu

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