This work concentrates on the study of long persistent fluorescence materials Ca

x

Sr

1-x

S:Bi

Tm

Cu and CaS:Eu. CaS and SrS are well known as host materials of fluorescence materials. The mixing of CaS and SrS hosts was introduced and made as one host material by sintering. The peaks of Bi

3+

ion emissions in this host material shift to longer wavelength (smaller wavenumber) because of the great dependence of Bi

3+

on host materials. The other part of the work included is the study of CaS:Eu long persistence fluorescence material

in which a trap center mechanism was introduced. The results showed that the persistence time of CaS:Eu is longer than that without the trap center.