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Revealing the nature of the Zn2GeO4 bluish-white emission in microwave-assisted hydrothermal synthesized nanorods

2025-04-01Artigo científico Acesso aberto
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dc.contributor.authorDias, Miguel P.
dc.contributor.authorBatista, Maria S.
dc.contributor.authorPimentel, Ana
dc.contributor.authorFortunato, Elvira
dc.contributor.authorMartins, Rodrigo
dc.contributor.authorCosta, Florinda M.
dc.contributor.authorPereira, Sónia O.
dc.contributor.authorRodrigues, Joana
dc.contributor.authorMonteiro, Teresa
dc.contributor.institutionCENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)
dc.contributor.institutionDCM - Departamento de Ciência dos Materiais
dc.contributor.pblElsevier Science Publisher B.V.
dc.date.accessioned2025-06-20T21:14:46Z
dc.date.available2025-06-20T21:14:46Z
dc.date.issued2025-04-01
dc.descriptionThis study has the support of the Institute for Nanostructures, Nanomodelling and Nanofabrication (i3N), through projects UIDB/50025/2020–2023 & UIDP/50025/2020–2023 & LA/P/0037/2020, as well as IonProGO (2022.05329. PTDC), DOI: 10.54499/2022.05329, 2023.00054. RESTART, LIGHEART (2022.08597. PTDC) and, CO2RED (PTDC/EQU-EPQ/2195/2021) projects, all funded by the Foundation for Science and Technology (FCT). J. Rodrigues acknowledges FCT for Programme Stimulus of Scientific Employment–Individual Support (grant 2022.00010. CEECIND/CP1720/CT0023, DOI: 10.54499/2022.00010. CEECIND/CP1720/CT0023). M. S. Batista thanks i3N and FCT for the PhD grant (UI/BD/152567/2022). Publisher Copyright: © 2025 The Authors
dc.description.abstractRecently, zinc germanate (Zn2GeO4, ZGO) has emerged as a material with significant potential for various applications due to its unique optical properties. Undoped, manganese (Mn) and and chromium (Cr)-doped ZGO were synthesized through microwave-assisted hydrothermal methods. The as-synthesized and thermal annealed materials were morphological and structurally characterized, and the optical properties of these willemite prismatic nanorods were thoroughly investigated. A room temperature (RT) bandgap energy close to 236 nm (∼5.25 eV) was obtained, which is slightly higher than the values reported so far in the literature. Furthermore, optically active absorption and luminescence bands from the ultraviolet to near-infrared were identified. All samples present intrinsic defect absorption with a maximum at 271 nm (∼4.58 eV) and a charge transfer Mn2+-O2- absorption band at 315 nm (∼3.94 eV). In addition, the so-called bluish-white structureless broad emission band is observed at RT at ca. 480 nm (∼2.58 eV) for all the analyzed samples. Our investigation indicates that this band is due to the overlap of two emitting centers: an intrinsic defect originating a blue luminescence (BL) and the 4T1→6A1 intraionic transition of Mn2+ leading to a green luminescence (GL), confirming Mn as a common contaminant in this matrix. For the Cr-doped samples, the thermal annealing treatment was seen to promote changes in the visible and near infrared (NIR) intraionic absorption bands. This enabled the identification of the presence of trivalent and tetravalent Cr ion charge states. Additionally, temperature-dependent photoluminescence measurements were carried out in the case of the as-synthesized ZGO:Mn, which is the sample with the highest GL intensity. It was found that the intensity of GL decreases with temperature (from 18 K to RT), with a thermal activation energy of 18 ± 2 meV for the nonradiative processes that compete with the observed luminescence. Moreover, persistent emission from the Mn2+ GL was recorded for at least 5 s and was attributed to multi-trapping/de-trapping processes occurring at different trap depths, which are responsible for the distinct decays observed.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent8
dc.format.extent5891541
dc.identifier.doi10.1016/j.matchemphys.2025.130463
dc.identifier.issn0254-0584
dc.identifier.otherPURE: 118933779
dc.identifier.otherPURE UUID: 2e31ed0a-3fa4-4585-a466-36ecb132da44
dc.identifier.otherScopus: 85216454574
dc.identifier.otherWOS: 001422506700001
dc.identifier.otherORCID: /0000-0002-4202-7047/work/186399293
dc.identifier.urihttp://hdl.handle.net/10362/184289
dc.identifier.urlhttps://www.scopus.com/pages/publications/85216454574
dc.identifier.urlhttps://www.webofscience.com/wos/woscc/full-record/WOS:001422506700001
dc.language.isoeng
dc.peerreviewedyes
dc.relationinfo:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F50025%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50025%2F2020/PT
dc.relationInstitute of Nanostructures, Nanomodelling and Nanofabrication
dc.relationInstitute of Nanostructures, Nanomodelling and Nanofabrication
dc.relationIon beam processing of Ga2O3
dc.relationEnergy-efficient photocatalysis: ultraviolet long persistent luminescent phosphors as inner light for photocatalytic applications
dc.relationPersistent red luminescence in doped zinc gallogermanate ZGGO nanoparticles aiming bioimaging applications
dc.relationinfo:eu-repo/grantAgreement/FCT/CEEC IND5ed/2022.00010.CEECIND%2FCP1720%2FCT0023/PT
dc.relationinfo:eu-repo/grantAgreement/FCT//UI%2FBD%2F152567%2F2022/PT
dc.subjectDefects
dc.subjectDoping
dc.subjectNanorods
dc.subjectPersistent luminescence
dc.subjectZinc germanate
dc.subjectGeneral Materials Science
dc.subjectCondensed Matter Physics
dc.titleRevealing the nature of the Zn2GeO4 bluish-white emission in microwave-assisted hydrothermal synthesized nanorodsen
dc.typejournal article
degois.publication.firstPage1
degois.publication.lastPage8
degois.publication.titleMaterials Chemistry And Physics
degois.publication.volume334
dspace.entity.typePublication
oaire.awardNumberUIDB/50025/2020
oaire.awardNumberUIDP/50025/2020
oaire.awardNumberLA/P/0037/2020
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oaire.awardNumberUI/BD/152567/2022
oaire.awardTitleInstitute of Nanostructures, Nanomodelling and Nanofabrication
oaire.awardTitleInstitute of Nanostructures, Nanomodelling and Nanofabrication
oaire.awardTitleIon beam processing of Ga2O3
oaire.awardTitleEnergy-efficient photocatalysis: ultraviolet long persistent luminescent phosphors as inner light for photocatalytic applications
oaire.awardTitlePersistent red luminescence in doped zinc gallogermanate ZGGO nanoparticles aiming bioimaging applications
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F50025%2F2020/PT
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oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0037%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Concurso de Projetos de I&D em Todos os Domínios Científicos - 2022/2022.05329.PTDC/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/2022.08597.PTDC/PT info:eu-repo/grantAgreement/FCT/Concurso de Projetos IC&DT em Todos os Domínios Científicos/PTDC%2FEQU-EPQ%2F2195%2F2021/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/CEEC IND5ed/2022.00010.CEECIND%2FCP1720%2FCT0023/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//UI%2FBD%2F152567%2F2022/PT
oaire.fundingStreamConcurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017/2018) - Financiamento Base
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamConcurso de Projetos de I&D em Todos os Domínios Científicos - 2022
oaire.fundingStream3599-PPCDT
oaire.fundingStreamCEEC IND5ed
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