Thermoluminescence in Single Crystal Alpha-Al2O3

Publisher Website
Google Scholar
Abstract
A review is given of thermoluminescence glow curves in single crystal samples of a-Al2O3 over the temperature range 10-700 K due to excitation with ultraviolet light, X rays or ? rays. Whenever possible the traps responsible are identified and the sign of the charge carriers determined from other measurements such as those of thermally stimulated currents, electron spin resonance, and optical absorption. In most cases the emission occurs at 320 nm, 410 nm, and/or 695 nm and is due to radiative transitions of F+ centres, F centres, and Cr3+ (R-lines) respectively. Two general conclusions are drawn: 1) the reduction/oxidation history of a sample is important e.g. the ultraviolet sensitivity is due to reduction of a sample during crystal growth and 2) little is currently known of the traps involved in the thermoluminescence response, especially electron traps.

This publication has 0 references indexed in Scilit: