Photoluminescence dynamics in strontium titanate
| Autor: | F. Miletto Granozio, Francesca Ciccullo, Andrea Rubano, U. Scotti di Uccio, Domenico Paparo, Lorenzo Marrucci |
|---|---|
| Přispěvatelé: | Rubano, Andrea, F., Ciccullo, D., Paparo, F., Miletto Granozio, SCOTTI DI UCCIO, Umberto, Marrucci, Lorenzo |
| Rok vydání: | 2009 |
| Předmět: |
Photoluminescence
Doping Biophysics Mineralogy General Chemistry Electron hole Nanosecond Condensed Matter Physics Biochemistry electronic relaxation Atomic and Molecular Physics and Optics chemistry.chemical_compound chemistry Chemical physics Strontium titanate strontium titanate Luminescence Excitation Perovskite (structure) |
| Zdroj: | Journal of Luminescence. 129:1923-1926 |
| ISSN: | 0022-2313 |
| Popis: | The recombination dynamics of electron–hole pairs of pure and n-doped strontium titanate (STO) bulk samples after an intense UV laser-pulse excitation has been investigated by collecting and analyzing the frequency- and time-resolved photoluminescence (PL) signal, as a function of the sample temperature. The observed PL decay is in the nanosecond time-scale and it shows a peculiar mixed kinetics. In particular, two decay channels are clearly singled-out: the faster one has a decay-time that is markedly dependent on the photo-excited carrier density and it is well described as a bimolecular recombination process, while the second slower channel shows an excitation-independent rate and follows an unimolecular law. The PL spectra show a considerable variation with temperature, with a previously unreported, pronounced difference between pure and doped samples emerging at high temperatures. A first discussion of the possible underlying mechanisms is attempted. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect