Rubano, Andrea and Scotti Di Uccio, Umberto and Marrucci, Lorenzo (2009) Blue luminescence of SrTiO3 under intense optical excitation. [Pubblicazione in rivista scientifica]

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Item Type: Pubblicazione in rivista scientifica
Lingua: English
Title: Blue luminescence of SrTiO3 under intense optical excitation
Scotti Di Uccio, UmbertoUNSPECIFIED
Marrucci, LorenzoUNSPECIFIED
Autore/i: A. Rubano, D. Paparo, F. Miletto Granozio, U. Scotti di Uccio, L. Marrucci
Date: 2009
Number of Pages: 11
Department: Scienze fisiche
Identification Number: 10.1063/1.3256140
Journal or Publication Title: JOURNAL OF APPLIED PHYSICS
Date: 2009
Volume: 106
Page Range: 103515-1-103515-11
Number of Pages: 11
Uncontrolled Keywords: blue luminescence, time-resolved spectroscopy, electronic relaxations, perovksite oxides, crystal defects, oxygen vacancies
Identification Number: 10.1063/1.3256140
Date Deposited: 21 Oct 2010 06:57
Last Modified: 30 Apr 2014 19:43


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.


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