In this paper

the selective excitation emission spectra

excitation spectra

luminescence decay

diffuse reflection spectra and EPR spectra of Ce-Mn activated calcium fluorophosphate are measured and analysed

two sort of Ce luminescence centers are first discovered and their situation are suggested

the energy transfer from Ce centers to Mn centers is studied.Two series of Ce

3+

emission spectra have been observed by means of selective excitation. One is double peak structure with the main emission peak at 332nm when the sample is excited at 254nm

the other is also double peaks structure with the main peak at 332nm when the sample is excited at 337nm. It is affirmed by analysing these spectra that the double peaks structure originate from the 5d-

2

F

7/2

and 5d-

2

F

5/2

transitions of Ce respectively. And the two series structure come from two kinds of luminescence centers(labslled Ce Ⅰ and Ce Ⅱ). Comparing the excitation spectra of Ce Ⅰ and Ce Ⅱ with the absorption spectra of FAP:Ce

it can be found that of Ce formed Ce Ⅰ centers.