| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312907 |
| ISSN: | 1516-1439 |
| Autores: | Cacho, Vanessa Duarte del1 Kassab, Luciana Reyes Pires Oliveira, Samuel Leite de2 Morimoto, Nilton Itiro |
| Instituciones: | 1Universidade de Sao Paulo, Escola Politecnica, Sao Paulo. Brasil 2Universidade de Sao Paulo, Instituto de Fisica, Sao Carlos, Sao Paulo. Brasil |
| Año: | 2006 |
| Periodo: | Ene-Mar |
| Volumen: | 9 |
| Número: | 1 |
| Paginación: | 21-24 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | Investigation of the blue cooperative luminescence in a binary composition of GeO2-PbO glasses with different Yb3+ concentrations is reported. High refractive index (1.96) and large transmission window (0.4 up to 5.0 µm) are characteristics of this vitreous system. Luminescence and lifetime measurements in the visible and near infrared regions were performed to investigate the spectroscopic characteristics of the glasses. Visible emission around 507 nm was detected in all samples. The visible emission intensity increases with the Yb2O3 content at least up to 2.0 wt. (%), that represents the maximum Yb2O3 concentration possible for this glass system. The visible lifetimes are about half of their respective near infrared ones, and the blue luminescence comes from a cooperative process. A rate equation was used to describe the behavior of the cooperative emission intensity as a function of Yb2O3 concentration; a good agreement with the calculated and measured cooperative luminescence was achieved |
| Disciplinas: | Ingeniería, Física y astronomía |
| Palabras clave: | Ingeniería de materiales, Física atómica y molecular, Optica, Luminiscencia, Fotónica |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Atomic and molecular physics, Optics, Luminescence, Photonics |
| Texto completo: | Texto completo (Ver HTML) |
