Experimental and theoretical studies of polaron optical properties in KNbO3 perovskite

Autor(en): Grigorjeva, L
Millers, DK
Pankratov, V
Williams, RT
Eglitis, RI
Kotomin, EA
Borstel, G
Stichwörter: 1ST-PRINCIPLES; ABO(3) perovskites; ABSORPTION; CRYSTALS; LUMINESCENCE; optical properties; Physics; Physics, Condensed Matter; POINT-DEFECTS; polarons; SEMIEMPIRICAL CALCULATIONS; TEMPERATURE
Erscheinungsdatum: 2004
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: SOLID STATE COMMUNICATIONS
Volumen: 129
Ausgabe: 11
Startseite: 691
Seitenende: 696
Zusammenfassung: 
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. (C) 2003 Elsevier Ltd. All rights reserved.
ISSN: 00381098
DOI: 10.1016/j.ssc.2003.12.031

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