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Temperature-Dependent Emission Kinetics of Colloidal Semiconductor Nanoplatelets Strongly Modified by Stacking
Onur Erdem1, Murat Olutas1,2, Burak Guzelturk1
1Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University , Ankara 06800, Turkey.
The Journal of Physical Chemistry Letters
|January 21, 2016
Summary
Stacking cadmium selenide nanoplatelets (NPLs) significantly alters their photoluminescence (PL) properties. Stacking reduces temperature dependence and shortens PL decay time by promoting energy transfer and trapping.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Solution-processed cadmium selenide nanoplatelets (NPLs) are promising materials for optoelectronic applications.
- Understanding their photoluminescence (PL) properties is crucial for device optimization.
- The effect of NPL arrangement, specifically stacking, on emission kinetics is not fully understood.
Purpose of the Study:
- To systematically investigate the temperature-dependent emission kinetics of stacked and nonstacked CdSe NPLs.
- To elucidate the underlying mechanisms governing PL intensity and decay time in different NPL arrangements.
- To develop a model explaining the observed phenomena in stacked NPL ensembles.
Main Methods:
- Fabrication of solution-processed CdSe NPL films with controlled stacking.
- Temperature-dependent steady-state photoluminescence (PL) measurements.
- Time-resolved photoluminescence (TRPL) decay measurements.
- Development and application of a probabilistic model using Markov chains for excitonic processes.
Main Results:
- Nonstacked NPLs showed a significant increase in PL intensity with decreasing temperature.
- Stacked NPLs exhibited only a slight increase in PL intensity with decreasing temperature.
- PL decay times were consistently shorter in stacked NPLs compared to nonstacked NPLs across all temperatures.
- The developed probabilistic model accurately reproduced the experimental observations.
Conclusions:
- NPL stacking significantly influences temperature-dependent PL intensity and decay kinetics.
- Energy transfer-assisted hole trapping in stacked NPLs competes with radiative recombination, leading to reduced temperature dependence.
- Accounting for NPL stacking is essential for understanding and predicting their photoluminescence emission properties.
