Characteristic UV luminescence from sol-gel silica coatings
Photoluminescence (PL) from silica coatings prepared via sol–gel under different conditions and using different precursors are investigated. Upon excitation with 3.85 eV (322 nm) light, the coatings prepared in air show a PL spectrum dominated by a peak at 3.35 eV (370 nm) with a shoulder at about 2...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2000 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/417605 |
| Acceso en línea: | http://hdl.handle.net/10261/417605 |
| Access Level: | acceso abierto |
| Palabra clave: | Photoluminescence Sol-gel coatings Silica |
| Sumario: | Photoluminescence (PL) from silica coatings prepared via sol–gel under different conditions and using different precursors are investigated. Upon excitation with 3.85 eV (322 nm) light, the coatings prepared in air show a PL spectrum dominated by a peak at 3.35 eV (370 nm) with a shoulder at about 2.95 eV (∼420 nm). After heat treatments under reducing conditions or when the coatings are prepared in an oxygen-controlled atmosphere, the PL spectrum at 3.35 eV exhibits a significant decrease in intensity. Results are discussed on the basis of silanol groups at superficial regions, oxygen-rich defects and the presence of residual organic matter in the coatings. |
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