Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations

Detalhes bibliográficos
Autor(a) principal: Rodrigues, Joana
Data de Publicação: 2019
Outros Autores: Smazna, Daria, Ben Sedrine, Nabiha, Nogales, Emilio, Adelung, Rainer, Mishra, Yogendra K., Mendez, Bianchi, Correia, Maria R., Monteiro, Teresa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/26364
Resumo: ZnO microwires synthesised by the flame transport method and decorated with C60 clusters were studied in detail by photoluminescence (PL) and cathodoluminescence (CL) techniques. The optical investigations suggest that the enhanced near band edge recombination observed in the ZnO/C60 composites is attributed to the reduction of the ZnO band tail states in the presence of C60. Well-resolved free and bound excitons recombination, as well as 3.31 eV emission, are observed with increasing amount of C60 flooding when compared with the ZnO reference sample. Moreover, a shift of the broad visible emission to lower energies occurs with increasing C60 content. In fact, this band was found to be composed by two optical centres peaked in the green and orange/red spectral regions, presenting different lifetimes. The orange/red band exhibits faster lifetime decay, in addition to a more pronounced shift to lower energies, while the peak position of the green emission only shows a slight change. The overall redshift of the broad visible band is further enhanced by the change in the relative intensity of the mentioned optical centres, depending on the excitation intensity and on the C60 flooding. These results suggest the possibility of controlling/tuning the visible emission outcome by increasing the C60 amount on the ZnO surface due to the surface states present in the semiconductor. An adequate control of such phenomena may have quite beneficial implications when sensing applications are envisaged.
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spelling Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigationsZnOPhotoluminescenceCathodoluminescenceC60ZnO microwires synthesised by the flame transport method and decorated with C60 clusters were studied in detail by photoluminescence (PL) and cathodoluminescence (CL) techniques. The optical investigations suggest that the enhanced near band edge recombination observed in the ZnO/C60 composites is attributed to the reduction of the ZnO band tail states in the presence of C60. Well-resolved free and bound excitons recombination, as well as 3.31 eV emission, are observed with increasing amount of C60 flooding when compared with the ZnO reference sample. Moreover, a shift of the broad visible emission to lower energies occurs with increasing C60 content. In fact, this band was found to be composed by two optical centres peaked in the green and orange/red spectral regions, presenting different lifetimes. The orange/red band exhibits faster lifetime decay, in addition to a more pronounced shift to lower energies, while the peak position of the green emission only shows a slight change. The overall redshift of the broad visible band is further enhanced by the change in the relative intensity of the mentioned optical centres, depending on the excitation intensity and on the C60 flooding. These results suggest the possibility of controlling/tuning the visible emission outcome by increasing the C60 amount on the ZnO surface due to the surface states present in the semiconductor. An adequate control of such phenomena may have quite beneficial implications when sensing applications are envisaged.Royal Society of Chemistry2019-08-01T14:51:40Z2019-01-31T00:00:00Z2019-01-31info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/26364eng10.1039/C8NA00296GRodrigues, JoanaSmazna, DariaBen Sedrine, NabihaNogales, EmilioAdelung, RainerMishra, Yogendra K.Mendez, BianchiCorreia, Maria R.Monteiro, Teresainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:51:02Zoai:ria.ua.pt:10773/26364Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:59:22.252445Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
title Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
spellingShingle Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
Rodrigues, Joana
ZnO
Photoluminescence
Cathodoluminescence
C60
title_short Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
title_full Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
title_fullStr Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
title_full_unstemmed Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
title_sort Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
author Rodrigues, Joana
author_facet Rodrigues, Joana
Smazna, Daria
Ben Sedrine, Nabiha
Nogales, Emilio
Adelung, Rainer
Mishra, Yogendra K.
Mendez, Bianchi
Correia, Maria R.
Monteiro, Teresa
author_role author
author2 Smazna, Daria
Ben Sedrine, Nabiha
Nogales, Emilio
Adelung, Rainer
Mishra, Yogendra K.
Mendez, Bianchi
Correia, Maria R.
Monteiro, Teresa
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Rodrigues, Joana
Smazna, Daria
Ben Sedrine, Nabiha
Nogales, Emilio
Adelung, Rainer
Mishra, Yogendra K.
Mendez, Bianchi
Correia, Maria R.
Monteiro, Teresa
dc.subject.por.fl_str_mv ZnO
Photoluminescence
Cathodoluminescence
C60
topic ZnO
Photoluminescence
Cathodoluminescence
C60
description ZnO microwires synthesised by the flame transport method and decorated with C60 clusters were studied in detail by photoluminescence (PL) and cathodoluminescence (CL) techniques. The optical investigations suggest that the enhanced near band edge recombination observed in the ZnO/C60 composites is attributed to the reduction of the ZnO band tail states in the presence of C60. Well-resolved free and bound excitons recombination, as well as 3.31 eV emission, are observed with increasing amount of C60 flooding when compared with the ZnO reference sample. Moreover, a shift of the broad visible emission to lower energies occurs with increasing C60 content. In fact, this band was found to be composed by two optical centres peaked in the green and orange/red spectral regions, presenting different lifetimes. The orange/red band exhibits faster lifetime decay, in addition to a more pronounced shift to lower energies, while the peak position of the green emission only shows a slight change. The overall redshift of the broad visible band is further enhanced by the change in the relative intensity of the mentioned optical centres, depending on the excitation intensity and on the C60 flooding. These results suggest the possibility of controlling/tuning the visible emission outcome by increasing the C60 amount on the ZnO surface due to the surface states present in the semiconductor. An adequate control of such phenomena may have quite beneficial implications when sensing applications are envisaged.
publishDate 2019
dc.date.none.fl_str_mv 2019-08-01T14:51:40Z
2019-01-31T00:00:00Z
2019-01-31
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 http://hdl.handle.net/10773/26364
url http://hdl.handle.net/10773/26364
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1039/C8NA00296G
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 Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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