Rubano, Andrea and Scotti Di Uccio, Umberto and Marrucci, Lorenzo (2009) Photoluminescence dynamics in strontium titanate. [Pubblicazione in rivista scientifica]
Il contenuto (Full text) non è disponibile all'interno di questo archivio.| Tipologia del documento: | Pubblicazione in rivista scientifica |
|---|---|
| Lingua: | English |
| Titolo: | Photoluminescence dynamics in strontium titanate |
| Autori: | Autore Email Rubano, Andrea [non definito] Scotti Di Uccio, Umberto [non definito] Marrucci, Lorenzo [non definito] |
| Autore/i: | A. Rubano, F. Ciccullo, D. Paparo, F. Miletto Granozio, U. Scotti di Uccio, L. Marrucci |
| Data: | 2009 |
| Numero di pagine: | 4 |
| Dipartimento: | Scienze fisiche |
| Numero identificativo: | 10.1016/j.jlumin.2009.02.037 |
| Titolo del periodico: | JOURNAL OF LUMINESCENCE |
| Data: | 2009 |
| Volume: | 129 |
| Intervallo di pagine: | pp. 1923-1926 |
| Numero di pagine: | 4 |
| Parole chiave: | Photoluminescence, strontium titanate, electronic relaxation |
| Numero identificativo: | 10.1016/j.jlumin.2009.02.037 |
| Depositato il: | 21 Ott 2010 06:57 |
| Ultima modifica: | 30 Apr 2014 19:43 |
| URI: | http://www.fedoa.unina.it/id/eprint/7587 |
Abstract
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 analysing 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.
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