Rubano, Andrea and Scotti Di Uccio, Umberto and Marrucci, Lorenzo (2009) Photoluminescence dynamics in strontium titanate. [Pubblicazione in rivista scientifica]
Full text not available from this repository.| Item Type: | Pubblicazione in rivista scientifica | ||||||||
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| Lingua: | English | ||||||||
| Title: | Photoluminescence dynamics in strontium titanate | ||||||||
| Creators: |
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| Autore/i: | A. Rubano, F. Ciccullo, D. Paparo, F. Miletto Granozio, U. Scotti di Uccio, L. Marrucci | ||||||||
| Date: | 2009 | ||||||||
| Number of Pages: | 4 | ||||||||
| Department: | Scienze fisiche | ||||||||
| Identification Number: | 10.1016/j.jlumin.2009.02.037 | ||||||||
| Journal or Publication Title: | JOURNAL OF LUMINESCENCE | ||||||||
| Date: | 2009 | ||||||||
| Volume: | 129 | ||||||||
| Page Range: | pp. 1923-1926 | ||||||||
| Number of Pages: | 4 | ||||||||
| Uncontrolled Keywords: | Photoluminescence, strontium titanate, electronic relaxation | ||||||||
| Identification Number: | 10.1016/j.jlumin.2009.02.037 | ||||||||
| Date Deposited: | 21 Oct 2010 06:57 | ||||||||
| Last Modified: | 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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