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Article: Anomalous Temperature-Dependent Exciton–Phonon Coupling in Cesium Lead Bromide Perovskite Nanosheets

TitleAnomalous Temperature-Dependent Exciton–Phonon Coupling in Cesium Lead Bromide Perovskite Nanosheets
Authors
Issue Date2019
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/
Citation
The Journal of Physical Chemistry C, 2019, v. 123 n. 8, p. 5128-5135 How to Cite?
AbstractThe role of exciton–phonon coupling in light emission in cesium lead bromide (CsPbBr3) nanosheets is investigated with combined photoluminescence spectroscopy and the multimode Brownian oscillator model. A good agreement between theory and experiment in the low temperature range of 5–40 K enables us to determine several key parameters, including the dimensionless Huang–Rhys factor characterizing the exciton–longitudinal-optical phonon coupling strength and the damping constant accounting for the phonon bath (quasi-continuous acoustic phonons) dissipation. It is found that the Huang–Rhys factor of the free excitons peculiarly tends to diminish upon increasing the temperature in the interested low temperature range. However, the damping constant shows a linear increase with temperature in the interested temperature range. These new findings may deepen the understanding of the exciton–phonon coupling in CsPbBr3 nanosheets and relevant solids.
Persistent Identifierhttp://hdl.handle.net/10722/269555
ISSN
2017 Impact Factor: 4.484
2015 SCImago Journal Rankings: 1.995
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLao, X-
dc.contributor.authorYang, Z-
dc.contributor.authorSu, Z-
dc.contributor.authorBao, Y-
dc.contributor.authorZhang, J-
dc.contributor.authorWang, X-
dc.contributor.authorCui, X-
dc.contributor.authorWang, M-
dc.contributor.authorYao, X-
dc.contributor.authorXu, S-
dc.date.accessioned2019-04-24T08:10:06Z-
dc.date.available2019-04-24T08:10:06Z-
dc.date.issued2019-
dc.identifier.citationThe Journal of Physical Chemistry C, 2019, v. 123 n. 8, p. 5128-5135-
dc.identifier.issn1932-7447-
dc.identifier.urihttp://hdl.handle.net/10722/269555-
dc.description.abstractThe role of exciton–phonon coupling in light emission in cesium lead bromide (CsPbBr3) nanosheets is investigated with combined photoluminescence spectroscopy and the multimode Brownian oscillator model. A good agreement between theory and experiment in the low temperature range of 5–40 K enables us to determine several key parameters, including the dimensionless Huang–Rhys factor characterizing the exciton–longitudinal-optical phonon coupling strength and the damping constant accounting for the phonon bath (quasi-continuous acoustic phonons) dissipation. It is found that the Huang–Rhys factor of the free excitons peculiarly tends to diminish upon increasing the temperature in the interested low temperature range. However, the damping constant shows a linear increase with temperature in the interested temperature range. These new findings may deepen the understanding of the exciton–phonon coupling in CsPbBr3 nanosheets and relevant solids.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/-
dc.relation.ispartofThe Journal of Physical Chemistry C-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acs.jpcc.9b00091.-
dc.titleAnomalous Temperature-Dependent Exciton–Phonon Coupling in Cesium Lead Bromide Perovskite Nanosheets-
dc.typeArticle-
dc.identifier.emailCui, X: xdcui@hku.hk-
dc.identifier.emailXu, S: sjxu@hku.hk-
dc.identifier.authorityCui, X=rp00689-
dc.identifier.authorityXu, S=rp00821-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acs.jpcc.9b00091-
dc.identifier.scopuseid_2-s2.0-85061909305-
dc.identifier.hkuros297405-
dc.identifier.volume123-
dc.identifier.issue8-
dc.identifier.spage5128-
dc.identifier.epage5135-
dc.identifier.isiWOS:000460365200053-
dc.publisher.placeUnited States-

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