Blue luminescence of SrTiO3 under intense optical excitation

RUBANO, ANDREA and SCOTTI DI UCCIO, UMBERTO and MARRUCCI, LORENZO (2009) Blue luminescence of SrTiO3 under intense optical excitation. [Pubblicazione su rivista scientifica]

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Abstract

The blue-green photoluminescence emitted by pure and electron-doped strontium titanate under intense pulsed near-ultraviolet excitation is studied experimentally as a function of excitation intensity and temperature. Both emission spectra and time-resolved decays of the emission are measured and analyzed in the framework of simple phenomenological models. We find an interesting blue-to-green transition occurring for increasing temperatures in pure samples, which is absent in doped materials. The luminescence yield and decay rate measured as a function of temperature can be modeled well as standard activated behaviors. The leading electron-hole recombination process taking place in the initial decay is established to be second order, or bimolecular, in contrast to recent reports favoring a third-order interpretation as an Auger process. The temporal decay of the luminescence can be described well by a model based on two interacting populations of excitations, respectively identified with interacting defect-trapped possibly forming excitons and mobile charges. Finally, from the measured doping and sample dependence of the luminescence yield, we conclude that the radiative centers responsible for the luminescence are probably intrinsic structural defects other than bulk oxygen vacancies.

Tipologia di documento:Pubblicazione su rivista scientifica
Parole chiave:blue luminescence, time-resolved spectroscopy, electronic relaxations, perovksite oxides, crystal defects, oxygen vacancies
Settori scientifico-disciplinari MIUR:Non specificato
Stato del full text:Accessibilità ristretta
Data:2009
Altri Autori:A. Rubano, D. Paparo, F. Miletto Granozio, U. Scotti di Uccio, L. Marrucci
Numero di pagine:11
Intervallo di pagina:103515-1-103515-11
Volume:106
Dipartimento o Struttura:Dipartimento di Scienze Fisiche
Numero identificativo:10.1063/1.3256140
Titolo rivista/pubblicazione:JOURNAL OF APPLIED PHYSICS
Numero di sistema:7508
Depositato il:21 Ottobre 2010 08:57
Ultima modifica:21 Ottobre 2010 08:57

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