The spectroscopic properties of the solid solutions(1-

x

) CeMgAl

11

O

19

-

x

SrAl

12

O

19

:Mn

2+

are reported. The fluorescent spectra of Mn

2+

in the solid solutions consist of two emission bands

a green band peaked at with 516nm and a red band

the peak position of which depends on

x

with 685nm for

x

=0 and 630nm for

x

=0.8. The green band arised from Mn

2+

centers in tetrahedral 4f sites (denoted as Mn

2+

(g)) and the red band originated from Mn

2+

ions in octahedral 2a position (Mn

2+

(r)).The fluorescence decay analysis and excitation spectra indicated that the energy transfer from Mn

2+

(g) to Mn

2+

(r) occurred in the solid solutions (1-

x

) CeMgAl

11

O

19

-

x

SrAl

12

O

19

doped with higher Mn

2+

concentration (≥0.4mole).