Temperature-Dependent Emission Kinetics of Colloidal Semiconductor Nanoplatelets Strongly Modified by Stacking

The Journal of Physical Chemistry Letters
Onur ErdemHilmi Volkan Demir

Abstract

We systematically studied temperature-dependent emission kinetics in solid films of solution-processed CdSe nanoplatelets (NPLs) that are either intentionally stacked or nonstacked. We observed that the steady-state photoluminescence (PL) intensity of nonstacked NPLs considerably increases with decreasing temperature, whereas there is only a slight increase in stacked NPLs. Furthermore, PL decay time of the stacked NPL ensemble is comparatively much shorter than that of the nonstacked NPLs, and this result is consistent at all temperatures. To account for these observations, we developed a probabilistic model that describes excitonic processes in a stack using Markov chains, and we found excellent agreement between the model and experimental results. These findings develop the insight that the competition between the radiative channels and energy transfer-assisted hole trapping leads to weakly temperature-dependent PL intensity in the case of the stacked NPL ensembles as compared to the nonstacked NPLs lacking strong energy transfer. This study shows that it is essential to account for the effect of NPL stacking to understand their resulting PL emission properties.

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Jun 3, 2014·ACS Nano·Burak GuzelturkHilmi Volkan Demir
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Dec 4, 2014·ACS Nano·Burak GuzelturkHilmi Volkan Demir
Jan 13, 2015·Nanoscale·Burak GuzelturkHilmi Volkan Demir
Sep 8, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Santanu JanaBenjamin Abécassis

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Citations

Dec 30, 2020·Nanomaterials·Ivan SkurlovAleksandr Litvin
Feb 26, 2021·The Journal of Physical Chemistry Letters·Savas DelikanliHilmi Volkan Demir
Sep 25, 2018·Nano Letters·Benjamin T DirollRichard D Schaller
May 16, 2019·The Journal of Physical Chemistry Letters·Yuanyuan LiuKui Yu

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