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EnglishThe sensitizing action of amorphous silicon nanoclusters on erbium ions in thin silica films has been studied under low-energy (long wavelength) optical excitation. Profound differences in fast visible and infrared emission dynamics have been found with respect to the high-energy (short wavelength) case. These findings point out to a strong dependence of the energy transfer process on the optical excitation energy. Total inhibition of energy transfer to erbium states higher than the first excited state (4I13/2) has been demonstrated for excitation energy below 1.82 eV (excitation wavelength longer than 680 nm). Direct excitation of erbium ions to the first excited state (4I13/2) has been confirmed to be the dominant energy transfer mechanism over the whole spectral range of optical excitation used (540 nm–680 nm).
Silicon nanocluster sensitization of erbium ions under low-energy optical excitation / Prtljaga, Nikola; Navarro-Urrios, Daniel; Pitanti, Alessandro; Ferrarese-Lupi, Federico; Garrido, Blas; Pavesi, Lorenzo. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 111:9(2012), p. 094314.
| Titolo: | Silicon nanocluster sensitization of erbium ions under low-energy optical excitation | |
| Autori: | ||
| Data di pubblicazione: | 2012 | |
| Rivista: | JOURNAL OF APPLIED PHYSICS | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1063/1.4712626 | |
| Abstract: | The sensitizing action of amorphous silicon nanoclusters on erbium ions in thin silica films has ...been studied under low-energy (long wavelength) optical excitation. Profound differences in fast visible and infrared emission dynamics have been found with respect to the high-energy (short wavelength) case. These findings point out to a strong dependence of the energy transfer process on the optical excitation energy. Total inhibition of energy transfer to erbium states higher than the first excited state (4I13/2) has been demonstrated for excitation energy below 1.82 eV (excitation wavelength longer than 680 nm). Direct excitation of erbium ions to the first excited state (4I13/2) has been confirmed to be the dominant energy transfer mechanism over the whole spectral range of optical excitation used (540 nm–680 nm). | |
| Full-text (pubblici): | none | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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