Abstract
The direct and indirect methods of experimental detection of deep traps in wide-gap insulators are described. The experimentally observed effects of influence of deep traps with different nature on luminescent and dosimetric properties of materials are analyzed. It is established that the most wide-spread and well-studied effects are the sensitization and superlinearity of dose response. They are interpreted in terms of the kinetic model of competitive electron traps. Taking into account the temperature dependence of capture probability by deep traps in this model allows one to explain some new effects associated with luminescence thermal quenching. The luminescence model of Al2O3:C single crystal is described. In this model the temperature dependence of competitive interaction between the main and deep traps is caused by thermal ionization of excited states of F-centers.
Highlights
The mechanisms and features of thermoluminescence (TL) in different materials are studied in terms of necessity of solution of fundamental and applied tasks associated with its application in radiation dosimetry, geology, archaeology and temperature sensing
We proposed the model [35] which describes the mechanism of luminescence in Al2O3:C single crystals
Deep trapping centers in wide-gap insulators can be experimentally detected by the method of direct observation of the high-temperature TL peaks as well as by a number of indirect methods
Summary
The mechanisms and features of thermoluminescence (TL) in different materials are studied in terms of necessity of solution of fundamental and applied tasks associated with its application in radiation dosimetry, geology, archaeology and temperature sensing. In a simple TL model only two localized levels are taken into account: an electron trap and recombination center. The development of this model is an account of the competing effects of deep trapping centers. The available literature information about the role of deep centers in the TL mechanism in different materials has an odd and non-systemized character. In this regard, the aim of this work is to reveal general regularities and mechanisms of effect of deep traps on luminescent and dosimetric properties of wide-gap materials on the base of the analysis of available experimental data and kinetic models of TL
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