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Title: Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets
Authors: Bose, Sumanta
Shendre, Sushant
Song, Zhigang
Sharma, Vijay Kumar
Zhang, Dao Hua
Dang, Cuong
Fan, Weijun
Demir, Hilmi Volkan
Keywords: Nanoplatelets (NPLs)
Colloidal Cadmium Selenide (CdSe)
Issue Date: 2017
Source: Bose, S., Shendre, S., Song, Z., Sharma, V. K., Zhang, D. H., Dang, C., et al. (2017). Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets. Nanoscale, 9, 6595-6605.
Series/Report no.: Nanoscale
Abstract: Colloidal Cadmium Selenide (CdSe) nanoplatelets (NPLs) are a recently developed class of efficient luminescent nanomaterial suitable for optoelectronic device applications. A change in temperature greatly affects their electronic bandstructure and luminescence properties. It is important to understand how-and-why the characteristics of NPLs are influenced, particularly at elevated temperature, where both reversible and irreversible quenching processes come into picture. Here we present a study on the effect of elevated temperature on the characteristics of colloidal CdSe NPLs. We used an effective-mass envelope function theory based 8-band k·p model and density-matrix theory considering exciton-phonon interaction. We observed the photoluminescence (PL) spectra at various temperatures for their photon emission energy, PL linewidth and intensity by considering the exciton-phonon interaction with both acoustic and optical phonons using Bose-Einstein statistical factors. With rise in temperature we observed a fall in the transition energy (emission redshift), matrix element, Fermi factor and quasi Fermi separation, with reduction in intraband state gaps and increased interband coupling. Also, there was a fall in the PL intensity, along with spectral broadening due to an intraband scattering effect. The predicted transition energy values and simulated PL spectra at varying temperatures exhibit appreciable consistency with experimental results. Our findings have important implications for application of NPLs in optoelectronic devices, such as NPL lasers and LEDs, operating much above room temperature.
ISSN: 2040-3364
DOI: 10.1039/C7NR00163K
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Centre for OptoElectronics and Biophotonics (OPTIMUS) 
LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays 
The Photonics Institute 
Rights: © 2017 Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Nanoscale, Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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