Spectroscopic studies of γ-rayed CaF2:Sr

Optical absorption spectra of gamma irradiated (gamma-rayed) Strontium (Sr) doped Calcium fluoride (CaF2) single crystals showed a prominent absorption peak at similar to 370 nm and two weak ones at similar to 463 and 524 nm. At higher gamma-dose the two weak peaks merged into a broad one at similar to 520 nm. The Photoluminescence (PL) spectra showed a prominent emission at similar to 394 nm when the crystals were excited at similar to 240 nm. The excitation of samples at 370 nm showed strong emission at similar to 530 nm with a shoulder at similar to 465 nm. The optical absorption and PL intensities were found to increase with gamma-dose. However, the optical absorption and PL intensities of CaF2:Sr are found to be less than those of undoped CaF2 single crystals. (C) 2013 Elsevier B.V. All rights reserved.