Optical Property of Ce3+-ion-doped LiCaAlF6Crystal in Vacuum Ultraviolet Region

The optical properties of a Ce 3+ -ion-doped LiCaAlF 6 (Ce:LiCAF) crystal is investigated in the vacuum ultraviolet (VUV) region. It is found that the optical excitation from the valence band of the LiCAF crystal to the 2 E g excited state of Ce 3+ can be utilized as an efficient excitation channel to obtain an ultraviolet emission due to the 4f-5d transition of Ce 3+ . Furthermore, the energy level of the 2 E g state is found to be located near the conduction band of the LiCAF crystal, which leads to the electron transfer from the LiCAF crystal to the active Ce 3+ ion.