Lithium fluoride crystals are irradiated at various doses by gamma rays at 77 K. The time evolution of photoluminescence signals from aggregated F2+, F2, F3+and F3color centers, and of the absorption intensity of primary F centers are measured at various annealing temperatures. The lifetimes of anionic vacancies υaand F2+centers, the characteristic times of concentration growth of F2, F3+and F3centers, and also the activation energies of diffusion of vacancies and F2+centers together with various processes of aggregation are determined. It is found that lifetime decreases for vacancies while increases for F2+centers by increasing the irradiation dose. It is also shown that, after irradiation during annealing, vacancies are formed as a result of the reaction F2++H→υa+Fl-, where Fl-is a fluorine ion in a lattice site and H is a fluorine interstitial atom. Then these vacancies participate in color centers aggregation kinetics. The presence of F-centers in the irradiated crystal is established, and the processes which lead to the formation of F2, F3+and F3centers after irradiation, are unveiled. © 2013 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
Voitovich, A. P., Kalinov, V. S., Runets, L. P., Stupak, A. P., Martynovich, E. F., Montereali, R. M., & Baldacchini, G. (2013). Color centers aggregation kinetics in lithium fluoride after gamma irradiation. Journal of Luminescence, 143, 207 - 214. https://doi.org/10.1016/j.jlumin.2013.04.004