The relative emission efficiency of F3+ and F2 centers as a function of their concentration has been investigated in LiF crystals colored at room temperature and -60°C with 3 MeV electrons. From a careful study of their absorption and emission spectra, we discovered that the emission efficiency η of both F3+ and F2 defects is constant up to ∼ 1016 centers/cm3. When increasing the concentration up to 1018 centers/cm3, η decreases slightly for the F2 centers and considerably for the F3+ ones, a difference which is bigger at room temperature with respect to liquid nitrogen temperature. A thermally activated process is taking place, where the F2 center and other aggregated defects play an important role.
All Science Journal Classification (ASJC) codes
- Surfaces, Coatings and Films
- Surfaces and Interfaces
Baldacchini, G., Menchini, F., & Montereali, R. M. (2003). Concentration quenching of photoluminescence. The case of F3+ and F2 color centers in LiF. Journal of the Electrochemical Society, 150(5), -. https://doi.org/10.1149/1.1566964