It is also known that phosphors should efficiently absorb the vacuum ultraviolet (VUV) light in order to obtain high luminescence efficiency. Activator excitation in the VUV usually takes place via the host lattice of VUV phosphor, and requires a host-to-activator energy transfer step [4]. Therefore, the host absorption efficiency and the energy transfer efficiency are very important for phosphors applied in VUV region. ·µ»ØСľ³æ²é¿´¸ü¶à