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Article: Mechanism of Single-Photon Upconversion Photoluminescence in All-Inorganic Perovskite Nanocrystals: The Role of Self-Trapped Excitons

TitleMechanism of Single-Photon Upconversion Photoluminescence in All-Inorganic Perovskite Nanocrystals: The Role of Self-Trapped Excitons
Authors
KeywordsBromine compounds
Cesium compounds
Excitons
Laser cooling
Lead compounds
Issue Date2019
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/loi/jpclcd
Citation
The Journal of Physical Chemistry Letters, 2019, v. 10 n. 20, p. 5989-5996 How to Cite?
AbstractThe efficient single-photon upconversion photoluminescence (UCPL) feature of lead halide perovskite semiconductors makes it promising for developing laser cooling devices. This is an attractive potential application, but the underlying physics still remains unclear so far. By using the all-inorganic CsPbX3 (X = Br, I) nanocrystal samples, this phenomenon was investigated by photoluminescence (PL) and time-resolved PL under different temperatures and various excitation conditions. A broad emission band located at the low-energy side of the free exciton (FE) peak was detected and deduced to be from the self-trapped exciton (STE). The lifetime of STE emission was found to be 171 ns at 10 K, much longer than that of FE. The UCPL phenomenon was then attributed to thermal activation of transformation from STEs to FEs, and the energy barrier was derived to be 103.7 meV for CsPbBr3 and 45.2 meV for CsPb(Br/I)3, respectively. The transformation also can be seen from the fluorescence decay processes.
Persistent Identifierhttp://hdl.handle.net/10722/279987
ISSN
2019 Impact Factor: 6.71
2015 SCImago Journal Rankings: 4.470

 

DC FieldValueLanguage
dc.contributor.authorMa, X-
dc.contributor.authorPan, F-
dc.contributor.authorLi, H-
dc.contributor.authorShen, P-
dc.contributor.authorMa, C-
dc.contributor.authorZhang, L-
dc.contributor.authorNiu, H-
dc.contributor.authorZhu, Y-
dc.contributor.authorXu, S-
dc.contributor.authorYe, H-
dc.date.accessioned2019-12-23T08:24:37Z-
dc.date.available2019-12-23T08:24:37Z-
dc.date.issued2019-
dc.identifier.citationThe Journal of Physical Chemistry Letters, 2019, v. 10 n. 20, p. 5989-5996-
dc.identifier.issn1948-7185-
dc.identifier.urihttp://hdl.handle.net/10722/279987-
dc.description.abstractThe efficient single-photon upconversion photoluminescence (UCPL) feature of lead halide perovskite semiconductors makes it promising for developing laser cooling devices. This is an attractive potential application, but the underlying physics still remains unclear so far. By using the all-inorganic CsPbX3 (X = Br, I) nanocrystal samples, this phenomenon was investigated by photoluminescence (PL) and time-resolved PL under different temperatures and various excitation conditions. A broad emission band located at the low-energy side of the free exciton (FE) peak was detected and deduced to be from the self-trapped exciton (STE). The lifetime of STE emission was found to be 171 ns at 10 K, much longer than that of FE. The UCPL phenomenon was then attributed to thermal activation of transformation from STEs to FEs, and the energy barrier was derived to be 103.7 meV for CsPbBr3 and 45.2 meV for CsPb(Br/I)3, respectively. The transformation also can be seen from the fluorescence decay processes.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/loi/jpclcd-
dc.relation.ispartofThe Journal of Physical Chemistry Letters-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.subjectBromine compounds-
dc.subjectCesium compounds-
dc.subjectExcitons-
dc.subjectLaser cooling-
dc.subjectLead compounds-
dc.titleMechanism of Single-Photon Upconversion Photoluminescence in All-Inorganic Perovskite Nanocrystals: The Role of Self-Trapped Excitons-
dc.typeArticle-
dc.identifier.emailXu, S: sjxu@hku.hk-
dc.identifier.authorityXu, S=rp00821-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acs.jpclett.9b02289-
dc.identifier.pmid31549509-
dc.identifier.scopuseid_2-s2.0-85072935105-
dc.identifier.hkuros308715-
dc.identifier.volume10-
dc.identifier.issue20-
dc.identifier.spage5989-
dc.identifier.epage5996-
dc.publisher.placeUnited States-

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