Cascade up-conversion of photoluminescence in quantum dot ensembles

Detalhes bibliográficos
Autor(a) principal: Santos, João R.
Data de Publicação: 2008
Outros Autores: Vasilevskiy, Mikhail, Filonovich, Sergej
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: https://hdl.handle.net/1822/8801
Resumo: We present a theoretical model and Monte Carlo simulation results that naturally explain all the features of the thermally activated photoluminescence upconversion effect also known as anti-Stokes photoluminescence ASPL observed in ensembles of colloidal semiconductor nanocrystal quantum dots QDs . The proposed ASPL mechanism includes the following principal ingredients: i optical-phonon-assisted absorption of an incident photon in a relatively large dot in the ensemble, ii emission of a higher-energy photon from the zero-phonon exciton-polaron state, with an upconversion equal to one optical-phonon energy, and iii cascade reabsorption and re-emission processes involving QDs of successively smaller sizes within the sample, rendering the experimentally observed large anti-Stokes shift of the energy of the photon that finally leaves the sample. The results obtained by the Monte Carlo modeling based on the proposed mechanism reproduce all the experimentally observed ASPL trends in colloidal QD solutions.
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spelling Cascade up-conversion of photoluminescence in quantum dot ensemblescolloidsMonte Carlo methodsphonon-exciton interactionsphononsphotoluminescencepolaronssemiconductor quantum dotsthermoluminescenceScience & TechnologyWe present a theoretical model and Monte Carlo simulation results that naturally explain all the features of the thermally activated photoluminescence upconversion effect also known as anti-Stokes photoluminescence ASPL observed in ensembles of colloidal semiconductor nanocrystal quantum dots QDs . The proposed ASPL mechanism includes the following principal ingredients: i optical-phonon-assisted absorption of an incident photon in a relatively large dot in the ensemble, ii emission of a higher-energy photon from the zero-phonon exciton-polaron state, with an upconversion equal to one optical-phonon energy, and iii cascade reabsorption and re-emission processes involving QDs of successively smaller sizes within the sample, rendering the experimentally observed large anti-Stokes shift of the energy of the photon that finally leaves the sample. The results obtained by the Monte Carlo modeling based on the proposed mechanism reproduce all the experimentally observed ASPL trends in colloidal QD solutions.Fundação para a Ciência e a Tecnologia (FCT)American Physical SocietyUniversidade do MinhoSantos, João R.Vasilevskiy, MikhailFilonovich, Sergej2008-12-222008-12-22T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/8801engSantos, J. R., Vasilevskiy, M. I., & Filonovich, S. A. (2008, December 22). Cascade upconversion of photoluminescence in quantum dot ensembles. Physical Review B. American Physical Society (APS). http://doi.org/10.1103/physrevb.78.2454221098-01211550-235X10.1103/PhysRevB.78.245422info:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2024-05-11T06:26:52Zoai:repositorium.sdum.uminho.pt:1822/8801Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T15:53:40.462729Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Cascade up-conversion of photoluminescence in quantum dot ensembles
title Cascade up-conversion of photoluminescence in quantum dot ensembles
spellingShingle Cascade up-conversion of photoluminescence in quantum dot ensembles
Santos, João R.
colloids
Monte Carlo methods
phonon-exciton interactions
phonons
photoluminescence
polarons
semiconductor quantum dots
thermoluminescence
Science & Technology
title_short Cascade up-conversion of photoluminescence in quantum dot ensembles
title_full Cascade up-conversion of photoluminescence in quantum dot ensembles
title_fullStr Cascade up-conversion of photoluminescence in quantum dot ensembles
title_full_unstemmed Cascade up-conversion of photoluminescence in quantum dot ensembles
title_sort Cascade up-conversion of photoluminescence in quantum dot ensembles
author Santos, João R.
author_facet Santos, João R.
Vasilevskiy, Mikhail
Filonovich, Sergej
author_role author
author2 Vasilevskiy, Mikhail
Filonovich, Sergej
author2_role author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Santos, João R.
Vasilevskiy, Mikhail
Filonovich, Sergej
dc.subject.por.fl_str_mv colloids
Monte Carlo methods
phonon-exciton interactions
phonons
photoluminescence
polarons
semiconductor quantum dots
thermoluminescence
Science & Technology
topic colloids
Monte Carlo methods
phonon-exciton interactions
phonons
photoluminescence
polarons
semiconductor quantum dots
thermoluminescence
Science & Technology
description We present a theoretical model and Monte Carlo simulation results that naturally explain all the features of the thermally activated photoluminescence upconversion effect also known as anti-Stokes photoluminescence ASPL observed in ensembles of colloidal semiconductor nanocrystal quantum dots QDs . The proposed ASPL mechanism includes the following principal ingredients: i optical-phonon-assisted absorption of an incident photon in a relatively large dot in the ensemble, ii emission of a higher-energy photon from the zero-phonon exciton-polaron state, with an upconversion equal to one optical-phonon energy, and iii cascade reabsorption and re-emission processes involving QDs of successively smaller sizes within the sample, rendering the experimentally observed large anti-Stokes shift of the energy of the photon that finally leaves the sample. The results obtained by the Monte Carlo modeling based on the proposed mechanism reproduce all the experimentally observed ASPL trends in colloidal QD solutions.
publishDate 2008
dc.date.none.fl_str_mv 2008-12-22
2008-12-22T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://hdl.handle.net/1822/8801
url https://hdl.handle.net/1822/8801
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Santos, J. R., Vasilevskiy, M. I., & Filonovich, S. A. (2008, December 22). Cascade upconversion of photoluminescence in quantum dot ensembles. Physical Review B. American Physical Society (APS). http://doi.org/10.1103/physrevb.78.245422
1098-0121
1550-235X
10.1103/PhysRevB.78.245422
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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