Point defects related to 260 K thermostimulated luminescence in α-Al2O3
作者:
M. Springis,
P. Kulis,
I. Tale,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1995)
卷期:
Volume 134,
issue 1-4
页码: 481-483
ISSN:1042-0150
年代: 1995
DOI:10.1080/10420159508227273
出版商: Taylor & Francis Group
关键词: α-Al2O3;defects;thermoluminescence;photostimulation;radiation processes
数据来源: Taylor
摘要:
Thermo- and photostimulated processes are studied in reduced hydrogen containing α-Al2O3excited by UV light. It is found that UV excitation in F absorption band at 90 K results in a ionization of the F-centers and capture of released electrons at defects thus producing an anisotropy absorption band at 4.2 eV and the dominant thermoluminescence (TL) peak at 260 K. The 260 K TSL peak is accompanied by complete bleaching of the 4.2 eV absorption band andvice versa—by light stimulation in the region of the 4.2 eV band the 260 K TSL peak disappear and released electrons recombine with F+-centers. Both the effect of the preliminary high-temperature thermal treatment of samples on formation of 4.2 eV-centers and the observed dichroism characteristics allows to conclude that corresponding complex defect contains hydrogen and can involve vacancy pair.
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