title: Electrolytic coloration and spectral properties of O(2-)- and Mg(2+)-codoped LiF crystals.
abstract: O(2-)- and Mg(2+)-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. O(2-)-Va(+), O(2-)-Mg(2+), F, F2, F3(+) and Mg-perturbed F2(+) absorption bands are observed simultaneously in absorption spectrum of colored OMC LiF crystals. O(2-)-Va(+), O(2-)-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 O(2-)-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.
authors.affiliation: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, PR China. Electronic address: lqipaper@eyou.com.
authors.forename: Lan
authors.initials: L
authors.lastname: Qi
authors.affiliation: Department of Fundamental Subject, Tianjin Chengjian University, Tianjin 300384, PR China.
authors.forename: Meili
authors.initials: M
authors.lastname: Guo
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Han
authors.affiliation: Department of Physics, Tianjin University, Tianjin 300350, PR China.
authors.forename: Hongen
authors.initials: H
authors.lastname: Gu
keywords: Absorption; Color center; Electrolytic coloration; Fluorescence; LiF crystal