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RESEARCH PRODUCT
Experimental and theoretical studies of polaron optical properties in KNbO3 perovskite
Donats MillersRoberts I. EglitisLarisa GrigorjevaEugene A. KotominEugene A. KotominVladimir PankratovRichard T. WilliamsG. Borstelsubject
PhotoluminescenceAbsorption spectroscopyChemistryAnalytical chemistryGeneral ChemistryElectronCondensed Matter PhysicsPolaronMolecular physicsUltrafast laser spectroscopyMaterials ChemistrySpontaneous emissionLuminescencePerovskite (structure)description
Time-resolved absorption and luminescence spectra have been measured in KNbO3 perovskite crystals after pulsed band-gap excitation by 200 fs laser pulses and 10 ns electron pulses. Quantum chemical calculations using the large unit cell periodic model support the interpretation of the observed transient absorption bands at 0.8 and 1.1 eV as the self-trapped electron polarons and bound hole polarons, respectively. The activation energy for the 2.2 eV green luminescence quenching is 0.05 eV. We suggest that the short lifetime (,15 ns) of the luminescence at RT is caused by the radiative recombination of nearest electron and hole polarons. q 2003 Elsevier Ltd. All rights reserved.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-03-01 | Solid State Communications |