The red emission in two and three steps up-conversion process in a doped erbium SiO2–TiO2 sol–gel powder
| Autor: | E De la Rosa-Cruz, J. F. Mosiño, Marco-Antonio Meneses-Nava, J. Castañeda, Oracio Barbosa-García |
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| Rok vydání: | 2003 |
| Předmět: |
Photoluminescence
Doping Biophysics Analytical chemistry Physics::Optics chemistry.chemical_element Astrophysics::Cosmology and Extragalactic Astrophysics General Chemistry Condensed Matter Physics Biochemistry Fluorescence Atomic and Molecular Physics and Optics Spectral line Ion Erbium chemistry Emission spectrum Luminescence Astrophysics::Galaxy Astrophysics |
| Zdroj: | Journal of Luminescence. :504-509 |
| ISSN: | 0022-2313 |
| Popis: | The spectra of the two and three photon up-conversion process in SiO 2 -TiO 2 -doped erbium is studied and the nature of the red emission discussed. In both processes, the red emission ( 4 F 9/2, → 4 I 15/2 ) is measured, however, when pumped directly at 490 nm such emission is not observed. The two-photon up-conversion has to take place first in order to observe the red emission; meanwhile for the case of the three-photon up-conversion it is not necessary for this process to occur first. The fluorescence decay of the green up-converted and direct pumped green emissions were measured and consistently with our results a non-exponential decay is observed. |
| Databáze: | OpenAIRE |
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