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https://ri.ufs.br/jspui/handle/riufs/23423| Document Type: | Artigo |
| Title: | Photoluminescence of bismuth germanate phosphors with a silica-shell structure |
| Authors: | Oviedo, M. J. Han, J. K. Contreras, O. Macedo, Zélia Soares Hirata, Gustavo Alonso McKittrick, J. |
| Issue Date: | 2012 |
| Resumo : | An intense bluish-white emitting phosphor Bi4Ge3O12 (BGO) was synthesized by tartaric acid-assisted solgel method and covered with a SiO2 nanolayer by the sol-gel method. The cubic crystal structure of BGO was confirmed by X-ray diffraction. Transmission electron microscopy analysis revealed the particle size to be in the range of 6-20 nm. Under excitation with 4.3 eV photons the BGO powders showed a PL contribution centered at 2.43 eV that corresponds to the typical BGO luminescence associated with 3 P1Æ1 S0 of Bi3+ electron transitions. Radioluminescence measurements showed the predominant emission centered at 2.43 eV due to the intra-ionic Bi3+ transitions. The PL emission of the silica coated BGO nanoparticles presented a luminescence enhancement of more than 200% compared with the uncoated nanoparticles. This enhancement in photoluminescence is proposed to be related to the reflectivity (refractive index) between air-silica-BGO layers. |
| Keywords: | Bismuth germanate Sol-gel Silica coating Photoluminescence |
| ISSN: | 1875-3892 |
| Is part of: | Physics procedia |
| Language: | eng |
| Publisher / Institution : | Elsevier |
| Citation: | OVIEDO, M. J. et al. Photoluminescence of bismuth germanate phosphors with a silica-shell structure. Physics procedia, Amsterdam, v. 29, p. 91-96, 2012. Disponível em: https://www.sciencedirect.com/science/article/pii/S1875389212011819?via%3Dihub. Acesso em: 10 out. 2025. |
| License: | Creative Commons Atribuição-Não Comercial-Sem Derivações 3.0 Não Adaptada (CC BY-NC-ND 3.0) |
| URI: | https://ri.ufs.br/jspui/handle/riufs/23423 |
| Appears in Collections: | DFI - Artigos de periódicos |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| PhotoluminescenceBismuthGermanatePhosphors.pdf | 476,47 kB | Adobe PDF |  View/Open |
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