Temperature-dependent optoelectronic properties of quasi-2D colloidal cadmium selenide nanoplatelets

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage6605en_US
dc.citation.issueNumber19en_US
dc.citation.spage6595en_US
dc.citation.volumeNumber9en_US
dc.contributor.authorBose, S.en_US
dc.contributor.authorShendre, S.en_US
dc.contributor.authorSong, Z.en_US
dc.contributor.authorSharma, V. K.en_US
dc.contributor.authorZhang, D. H.en_US
dc.contributor.authorDang C.en_US
dc.contributor.authorFan, W.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2018-04-12T11:06:57Z
dc.date.available2018-04-12T11:06:57Z
dc.date.issued2017en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractColloidal cadmium selenide (CdSe) nanoplatelets (NPLs) are a recently developed class of efficient luminescent nanomaterials 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 temperatures, where both reversible and irreversible quenching processes come into the picture. Here we present a study of the effect of elevated temperatures 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 a rise in temperature we observed a fall in the transition energy (emission redshift), matrix element, Fermi factor and quasi Fermi separation, with a 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 the experimental results. Our findings have important implications for the application of NPLs in optoelectronic devices, such as NPL lasers and LEDs, operating much above room temperature.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T11:06:57Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2017en
dc.identifier.doi10.1039/c7nr00163ken_US
dc.identifier.issn2040-3364
dc.identifier.urihttp://hdl.handle.net/11693/37239
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttp://dx.doi.org/10.1039/c7nr00163ken_US
dc.source.titleNanoscaleen_US
dc.subjectCadmiumen_US
dc.subjectDensity functional theoryen_US
dc.subjectExcitonsen_US
dc.subjectLight emitting diodesen_US
dc.subjectLuminescenceen_US
dc.subjectOptoelectronic devicesen_US
dc.subjectPhononsen_US
dc.subjectSemiconductor quantum wellsen_US
dc.subjectStatistical mechanicsen_US
dc.subjectDensity matrix theoryen_US
dc.subjectEffective-mass envelope-functionen_US
dc.subjectElectronic band-structureen_US
dc.subjectExciton-phonon interactionsen_US
dc.subjectLuminescence propertiesen_US
dc.subjectOptoelectronic propertiesen_US
dc.subjectPhotoluminescence spectrumen_US
dc.subjectTemperature dependenten_US
dc.subjectCadmium compoundsen_US
dc.titleTemperature-dependent optoelectronic properties of quasi-2D colloidal cadmium selenide nanoplateletsen_US
dc.typeArticleen_US

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Institute of Materials Science and Nanotechnology (UNAM)
Department of Electrical and Electronics Engineering
Department of Physics