It is found that there is emission stimulated by infrared radiation for some aluminate phosphors doped by Eu

2+

such as SrAl

2

O

4

:Eu(green)

SrAl

14

O

25

:Eu(blue-green) and CaAl

2

O

4

:Eu(blue). Under the excitation of UV light

this kind of aluminate phosphors can give photoluminescence (PL).The PL spectrum of SrAl

14

O

25

:Eu peaked at about 265～280nm

under the excitation of 254nm.The stimulated emission spectrum is the same as PL spectrum for these Eu

2+

doped aluminate phosphors. Since the existence of deep electron traps in the phosphors

the excitation energy can be stored after the excitation of UV or sunlight

then the infrared radiation can induce the energy release by means of stimulated emission. The stimulated emission from the aluminate phosphor has a long decay time up to a few 10min.This phenomenon can be used to detect the infrared laser emission.