Abstract
O2−- and Mg2+-codoped (OMC) LiF crystals are colored electrolytically at various temperatures and voltages using a pointed cathode and a flat anode. F, F2, F3+, Mg-perturbed F and Mg-perturbed F2+ color centers are produced simultaneously in colored OMC LiF crystals. O2−−Va+, O2−−Mg2+, F, F2, F3+ and Mg-perturbed F2+ absorption bands are observed simultaneously in absorption spectrum of colored OMC LiF crystals. O2−−Va+, O2−−Va+ complexes, Mg-perturbed F, F2 and F3+ fluorescence bands are observed in fluorescence spectra of colored OMC LiF crystals. By using Mollwo-Ivey plot and fluorescence spectroscopy, a room-temperature O2−−Va+ absorption band at 225nm is determined. F3+ fluorescence of colored OMC LiF crystals is dominant as compared with F2 fluorescence with a single excitation of M-band light. Formation and conversion mechanisms of color centers are discussed.
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