Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , |
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. |
id |
RCAP_ade13cc7e7f2f12644ac166e7c8ca627 |
---|---|
oai_identifier_str |
oai:ria.ua.pt:10773/26364 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
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 |
|
_version_ |
1799137648335388672 |