Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/105288
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Devesa, Susana | - |
dc.contributor.author | Rodrigues, Joana | - |
dc.contributor.author | Teixeira, Sílvia Soreto | - |
dc.contributor.author | Rooney, Aidan P | - |
dc.contributor.author | Graça, Manuel P F | - |
dc.contributor.author | Cooper, David | - |
dc.contributor.author | Monteiro, Teresa | - |
dc.contributor.author | Costa, Luís C | - |
dc.date.accessioned | 2023-02-15T08:49:14Z | - |
dc.date.available | 2023-02-15T08:49:14Z | - |
dc.date.issued | 2021-03-08 | - |
dc.identifier.issn | 2079-4991 | pt |
dc.identifier.uri | https://hdl.handle.net/10316/105288 | - |
dc.description.abstract | Tetragonal Er0.5Nb0.5O2 and monoclinic ErNbO4 micro- and nanoparticles were prepared by the citrate sol-gel method and heat-treated at temperatures between 700 and 1600 °C. ErNbO4 revealed a spherical-shaped crystallite, whose size increased with heat treatment temperatures. To assess their optical properties at room temperature (RT), a thorough spectroscopic study was conducted. RT photoluminescence (PL) spectroscopy revealed that Er3+ optical activation was achieved in all samples. The photoluminescence spectra show the green/yellow 2H11/2, 4S3/2→4I15/2 and red 4F9/2→4I15/2 intraionic transitions as the main visible recombination, with the number of the crystal field splitting Er3+ multiplets reflecting the ion site symmetry in the crystalline phases. PL excitation allows the identification of Er3+ high-energy excited multiplets as the preferential population paths of the emitting levels. Independently of the crystalline structure, the intensity ratio between the green/yellow and red intraionic transitions was found to be strongly sensitive to the excitation energy. After pumping the samples with a resonant excitation into the 4G11/2 excited multiplet, a green/yellow transition stronger than the red one was observed, whereas the reverse occurred for higher excitation photon energies. Thus, a controllable selective excited tunable green to red color was achieved, which endows new opportunities for photonic and optoelectronic applications. | pt |
dc.language.iso | eng | pt |
dc.publisher | MDPI | pt |
dc.relation | UID/CTM/50025/2019 | pt |
dc.relation | UID/FIS/04564/2020 | pt |
dc.relation | POCI-01-0145-FEDER-028755 | pt |
dc.relation | Horizon 2020 ASCENT EU project (Access to European Nanoelectronics Network—Project n.º 654384 | pt |
dc.rights | openAccess | pt |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt |
dc.subject | erbium niobate | pt |
dc.subject | sol–gel | pt |
dc.subject | PL | pt |
dc.subject | PLE | pt |
dc.subject | TRPL | pt |
dc.title | Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles | pt |
dc.type | article | - |
degois.publication.firstPage | 660 | pt |
degois.publication.issue | 3 | pt |
degois.publication.title | Nanomaterials | pt |
dc.peerreviewed | yes | pt |
dc.identifier.doi | 10.3390/nano11030660 | pt |
degois.publication.volume | 11 | pt |
dc.date.embargo | 2021-03-08 | * |
uc.date.periodoEmbargo | 0 | pt |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.fulltext | Com Texto completo | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | article | - |
crisitem.author.researchunit | CFisUC – Center for Physics of the University of Coimbra | - |
crisitem.author.orcid | 0000-0002-2217-4584 | - |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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File | Description | Size | Format | |
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Tuning Green to Red Color in Erbium Niobate Micro- and.pdf | 7.01 MB | Adobe PDF | View/Open |
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