It was recalled that most thermoluminescence peaks in quartz which contained substituted Al and Li were related to the recombination, at luminescence centers, of electrons that were released thermally from [Di/Li]0 centers, where the Di were various defects. These centers were formed by suitable irradiation which led to the release of Lii ions from Al centers. Of particular interest were thermoluminescence peaks at 190, 180 and between 400 and 700K. The present work clearly revealed the relationship between the 190 and 180K thermoluminescence. The almost equal intensities at their maxima suggested that similar electron traps were associated with the 2 peaks. Both electron traps seemed to be [SiO4/Li]+ defects; with Li in differing Si sites. The comparatively weak thermoluminescence peaks at temperatures ranging from 130 to 270K were also attributed to electron traps of the form, [Di/Li]+. Moreover, the Li ions in these traps also appeared to come from Al-Li centers. This explained the observation that irradiation at temperatures below room temperature, followed by irradiation at 95K, suppressed thermoluminescence between 130 and 270K. According to the present results, Li ions were used up by irradiation near to room temperature; thus leading to the reduction in low-temperature Li-related electron traps.

A.Halperin: Materials Science Forum, 1997, 239-241, 29-32