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https://ri.ufs.br/jspui/handle/riufs/25644| Document Type: | Artigo |
| Title: | Effect of lithium excess on the LiAl5O8:Eu luminescent properties under VUV excitation |
| Authors: | Teixeira, Verônica de Carvalho Rodrigues, Lucas Carvalho Veloso Galante, Douglas Rezende, Marcos Vinícius dos Santos |
| Issue Date: | Sep-2016 |
| Resumo : | The influence of lithium excess and calcination temperature on the luminescence properties of the LiAl5O8:Eu under VUV excitation was investigated. The presence of both broad bands and sharp peaks in the VUV and X-ray emission spectra suggests the presence of Eu2+, even in absence of reducing atmosphere in the synthesis. The VUV excitation spectra indicated a band gap of 8.5 eV while the UV excited one showed the Eu3+ charge transfer transition starting at 3.9 eV. These values indicate that Eu2+ is stable in this host since its ground state is below the Fermi level of the host (ca. 4.1 eV). The relation between the intensity of Eu2+ and Eu3+ emissions showed that the reduction is favored at higher temperatures and lower Li content, leading to the proposition of a reduction mechanism based on the incorporation of charge compensation defects formed in the aliovalent doping of Eu3+ in Li+ sites. |
| Keywords: | Spectroscopy Fluorescence Fluorescent and luminescent materials Rare-earth-doped materials Photoluminescence Luminescence Ultraviolet vacuum Synchrotron radiation |
| ISSN: | 2159-3930 |
| Is part of: | Optical Materials Express |
| Language: | eng |
| Publisher / Institution : | Optical Society of America |
| Citation: | TEIXEIRA, V. C. et al. Effect of lithium excess on the LiAl5O8:Eu luminescent properties under VUV excitation. Optical Materials Express, Washington, v. 6, n. 9, set. 2016. Disponível em: https://opg.optica.org/ome/fulltext.cfm?uri=ome-6-9-2871. Acesso em: 23 jul. 2026. |
| License: | Creative Commons Atribuição 4.0 Internacional (CC BY 4.0) |
| Identifier: | https://doi.org/10.1364/OME.6.002871 |
| URI: | https://ri.ufs.br/jspui/handle/riufs/25644 |
| Appears in Collections: | DFI - Artigos de periódicos |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| EffectLithiumExcessLuminescentProperties.pdf | 2,65 MB | Adobe PDF |  View/Open |
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