Photo- and thermoluminescence in congruent SBN crystals doped with Ce and Cr
| Autor(en): | Kislova, IL Gao, M Kapphan, SE Pankrath, R Kutsenko, AB Vikhnin, VS |
Stichwörter: | defects; IMPURITY IONS; INDUCED CHARGE-TRANSFER; luminescence; Materials Science; Materials Science, Multidisciplinary; NB4+ POLARONS; NIR ABSORPTION; optical properties; oxides; PHOTOREFRACTIVE PROPERTIES; Physics; Physics, Condensed Matter; STRONTIUM-BARIUM NIOBATE | Erscheinungsdatum: | 2002 | Herausgeber: | TAYLOR & FRANCIS LTD | Journal: | FERROELECTRICS | Volumen: | 273 | Startseite: | 2565 | Seitenende: | 2570 | Zusammenfassung: | Photo-refractive properties of SrxBa1-xNb2O6 (SBN, x = 0.61 congruent) are enhanced by doping with Cerium and Chromium ions. The luminescence excitation and emission spectra combined with the absorption of the impurities allow to draw conclusions about the origin of the charge carriers from these defect centers. The well separated thermo-luminescence peaks detected and their spectral line shape point to specific recombination processes following the thermal liberation of light-induced electron trapping centers: Nb4+ polarons and VIS-centers created at low temperature under light irradiation. The thermal activation energy for the hopping motion of Nb4+ polarons and of VIS-centers are estimated to be 0.18 /- 0.02 eV and 0.30 /- 0.05 eV respectively. Possible relaxation mechanisms of SBN:Ce,Cr are discussed. |
Beschreibung: | 10th International Meeting on Ferroelectricity (IMF-10), MADRID, SPAIN, SEP 03-07, 2001 |
ISSN: | 00150193 |
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