Abstract: | Spatially separated defects created by photons with energies 6–8 eV in alkali-earth fluoride crystals doped with cerium are
investigated with the help of thermoluminescence. Measuring the spectra of creation of Vk and H peaks of thermostimulated luminescence inBaF
2:Ce3+. we demonstrate that photons with energies higher than 6eV induce H centers (self-trapped holes captured by interstitialF ions), whereas the formation of self-trapped holes begins on exposure to photons with energies greater than 7 eV. The influence
of photoionization on theCe
3+ luminescence inBaF
2, SrF2, CaF2, andCeF
3 crystals is investigated in the range of photon energies 4–8 eV. An exponentialCe
3+-emisson decay was observed for excitation energy lying in the range 4–6 eV. Slow and fast decay components were observed
under excitation by photons with energies higher than 6 eV. We believe that the slow and fast components are due to the tunnel
recombination of trapped electrons with hole centers.
A. P. Vinogradov Institute of Geochemistry of the Siberian Branch of the Russian Academy of Sciences. Translated from Izvestiya
Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 43–49, March, 2000. |