Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr)
Autor(a) principal: | |
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Data de Publicação: | 2022 |
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/10362/143794 |
Resumo: | Zn1+xGa2‐2xGexO4 (ZGGO:Cr)‐persistent phosphor, with a molar fraction, x, of x = 0.1, doped with a 0.5% molar of chromium, was synthesised via solid‐state reaction at 1350 °C for 36 h. X‐ray diffraction measurements and Raman spectroscopy evidence a single crystalline phase corresponding to the cubic spinel structure. Room temperature (RT) photoluminescence (PL) and afterglow decay profiles were investigated using above and below bandgap excitation. In both cases, persistent PL was observed for almost 8 h, mainly originating from a Cr3+ defect, the so‐called N2 optical centre. RT PL excitation and diffuse reflectance allow identification of the best pathways of Cr3+ red/NIR emission, as well as estimation of the ZGGO bandgap energy at 4.82 eV. An in‐depth investigation of the observed luminescence at 15 K and temperature‐dependent PL under site‐selective excitation reveals the spectral complexity of the presence of several optically active Cr3+ centres in the ZGGO host that emit in almost the same spectral region. Furthermore, the temperature dependence of the R‐lines’ intensity indicates the existence of thermal populating processes between the different optical centres. Such observations well account for a wide distribution of defect trap levels available for carrier capture/release, as measured by the persistent luminescence decay, from which the carriers are released preferentially to the N2 Cr3+‐related optical centre. |
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Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr)Persistent luminescence phosphorRed emitterTrapping centresZGGO:CrMaterials Science(all)InstrumentationEngineering(all)Process Chemistry and TechnologyComputer Science ApplicationsFluid Flow and Transfer ProcessesZn1+xGa2‐2xGexO4 (ZGGO:Cr)‐persistent phosphor, with a molar fraction, x, of x = 0.1, doped with a 0.5% molar of chromium, was synthesised via solid‐state reaction at 1350 °C for 36 h. X‐ray diffraction measurements and Raman spectroscopy evidence a single crystalline phase corresponding to the cubic spinel structure. Room temperature (RT) photoluminescence (PL) and afterglow decay profiles were investigated using above and below bandgap excitation. In both cases, persistent PL was observed for almost 8 h, mainly originating from a Cr3+ defect, the so‐called N2 optical centre. RT PL excitation and diffuse reflectance allow identification of the best pathways of Cr3+ red/NIR emission, as well as estimation of the ZGGO bandgap energy at 4.82 eV. An in‐depth investigation of the observed luminescence at 15 K and temperature‐dependent PL under site‐selective excitation reveals the spectral complexity of the presence of several optically active Cr3+ centres in the ZGGO host that emit in almost the same spectral region. Furthermore, the temperature dependence of the R‐lines’ intensity indicates the existence of thermal populating processes between the different optical centres. Such observations well account for a wide distribution of defect trap levels available for carrier capture/release, as measured by the persistent luminescence decay, from which the carriers are released preferentially to the N2 Cr3+‐related optical centre.CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)DCM - Departamento de Ciência dos MateriaisRUNBatista, Maria S.Rodrigues, JoanaRelvas, Maria S.Zanoni, JúliaGirão, Ana V.Pimentel, AnaCosta, Florinda M.Pereira, Sónia O.Monteiro, Teresa2022-09-16T22:27:18Z2022-02-172022-02-17T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article19application/pdfhttp://hdl.handle.net/10362/143794eng2076-3417PURE: 46579373https://doi.org/10.3390/app12042104info: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:RCAAP2024-03-11T05:22:32Zoai:run.unl.pt:10362/143794Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:51:08.709411Repositório 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 |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
title |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
spellingShingle |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) Batista, Maria S. Persistent luminescence phosphor Red emitter Trapping centres ZGGO:Cr Materials Science(all) Instrumentation Engineering(all) Process Chemistry and Technology Computer Science Applications Fluid Flow and Transfer Processes |
title_short |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
title_full |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
title_fullStr |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
title_full_unstemmed |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
title_sort |
Optical Studies in Red/NIR Persistent Luminescent Cr‐Doped Zinc Gallogermanate (ZGGO:Cr) |
author |
Batista, Maria S. |
author_facet |
Batista, Maria S. Rodrigues, Joana Relvas, Maria S. Zanoni, Júlia Girão, Ana V. Pimentel, Ana Costa, Florinda M. Pereira, Sónia O. Monteiro, Teresa |
author_role |
author |
author2 |
Rodrigues, Joana Relvas, Maria S. Zanoni, Júlia Girão, Ana V. Pimentel, Ana Costa, Florinda M. Pereira, Sónia O. Monteiro, Teresa |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N) DCM - Departamento de Ciência dos Materiais RUN |
dc.contributor.author.fl_str_mv |
Batista, Maria S. Rodrigues, Joana Relvas, Maria S. Zanoni, Júlia Girão, Ana V. Pimentel, Ana Costa, Florinda M. Pereira, Sónia O. Monteiro, Teresa |
dc.subject.por.fl_str_mv |
Persistent luminescence phosphor Red emitter Trapping centres ZGGO:Cr Materials Science(all) Instrumentation Engineering(all) Process Chemistry and Technology Computer Science Applications Fluid Flow and Transfer Processes |
topic |
Persistent luminescence phosphor Red emitter Trapping centres ZGGO:Cr Materials Science(all) Instrumentation Engineering(all) Process Chemistry and Technology Computer Science Applications Fluid Flow and Transfer Processes |
description |
Zn1+xGa2‐2xGexO4 (ZGGO:Cr)‐persistent phosphor, with a molar fraction, x, of x = 0.1, doped with a 0.5% molar of chromium, was synthesised via solid‐state reaction at 1350 °C for 36 h. X‐ray diffraction measurements and Raman spectroscopy evidence a single crystalline phase corresponding to the cubic spinel structure. Room temperature (RT) photoluminescence (PL) and afterglow decay profiles were investigated using above and below bandgap excitation. In both cases, persistent PL was observed for almost 8 h, mainly originating from a Cr3+ defect, the so‐called N2 optical centre. RT PL excitation and diffuse reflectance allow identification of the best pathways of Cr3+ red/NIR emission, as well as estimation of the ZGGO bandgap energy at 4.82 eV. An in‐depth investigation of the observed luminescence at 15 K and temperature‐dependent PL under site‐selective excitation reveals the spectral complexity of the presence of several optically active Cr3+ centres in the ZGGO host that emit in almost the same spectral region. Furthermore, the temperature dependence of the R‐lines’ intensity indicates the existence of thermal populating processes between the different optical centres. Such observations well account for a wide distribution of defect trap levels available for carrier capture/release, as measured by the persistent luminescence decay, from which the carriers are released preferentially to the N2 Cr3+‐related optical centre. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-09-16T22:27:18Z 2022-02-17 2022-02-17T00:00:00Z |
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 |
http://hdl.handle.net/10362/143794 |
url |
http://hdl.handle.net/10362/143794 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2076-3417 PURE: 46579373 https://doi.org/10.3390/app12042104 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
19 application/pdf |
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 |
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1799138106241187840 |