uminescence and long persistence property of SrAl

2

O

4

:Eu

2+

are investigated in the paper.It is analyzed by emission spectra that the Eu

2+

luminescence in the above phosphor is caused by 5d-4f transition.Its luminescence decay follows

I

=

ct

-n

which consists of the initial fast process and the later extremely slow process after 5 minutes.The thermoluminescent spectra of this phosphor consist two peaks.The temperatures of peak value are 117℃ and 155℃ respectively

this means the electron traps of phosphors are very deep

which can cause the extremely long persistence of SrAl

2

O

4

:Eu

2+

.