Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets
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 understa...
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sg-ntu-dr.10356-818132023-02-28T19:40:33Z Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets Bose, Sumanta Shendre, Sushant Song, Zhigang Sharma, Vijay Kumar Zhang, Dao Hua Dang, Cuong Fan, Weijun Demir, Hilmi Volkan School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences Centre for OptoElectronics and Biophotonics (OPTIMUS) LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays The Photonics Institute Nanoplatelets (NPLs) Colloidal Cadmium Selenide (CdSe) 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. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Accepted version 2017-04-17T08:05:16Z 2019-12-06T14:40:54Z 2017-04-17T08:05:16Z 2019-12-06T14:40:54Z 2017 2017 Journal Article 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. 2040-3364 https://hdl.handle.net/10356/81813 http://hdl.handle.net/10220/42275 10.1039/C7NR00163K 197687 en Nanoscale © 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: [http://dx.doi.org/10.1039/C7NR00163K]. 11 p. application/pdf |
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Nanoplatelets (NPLs) Colloidal Cadmium Selenide (CdSe) |
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Nanoplatelets (NPLs) Colloidal Cadmium Selenide (CdSe) Bose, Sumanta Shendre, Sushant Song, Zhigang Sharma, Vijay Kumar Zhang, Dao Hua Dang, Cuong Fan, Weijun Demir, Hilmi Volkan Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets |
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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. |
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School of Electrical and Electronic Engineering |
author_facet |
School of Electrical and Electronic Engineering Bose, Sumanta Shendre, Sushant Song, Zhigang Sharma, Vijay Kumar Zhang, Dao Hua Dang, Cuong Fan, Weijun Demir, Hilmi Volkan |
format |
Article |
author |
Bose, Sumanta Shendre, Sushant Song, Zhigang Sharma, Vijay Kumar Zhang, Dao Hua Dang, Cuong Fan, Weijun Demir, Hilmi Volkan |
author_sort |
Bose, Sumanta |
title |
Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets |
title_short |
Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets |
title_full |
Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets |
title_fullStr |
Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets |
title_full_unstemmed |
Temperature-dependent Optoelectronic Properties of Quasi-2D Colloidal Cadmium Selenide Nanoplatelets |
title_sort |
temperature-dependent optoelectronic properties of quasi-2d colloidal cadmium selenide nanoplatelets |
publishDate |
2017 |
url |
https://hdl.handle.net/10356/81813 http://hdl.handle.net/10220/42275 |
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1759857334407921664 |