In this work we investigated the

5

D

1

-

5

D

0

relaxation properties of Eu

3+

in the La-phosphate glass.The composition of the sample has been given in reference

in which the iluorescent spectra and selective site spectra of the

5

D

0

state were investigated.The Fig.1 given the transmisson spectrum of the sample measured by Peken-Elmer spectrometer at room temperature.From Fig.l

it can be seen that

5

D

1

state is split into two stark levels

which crresponding to absorption peaks at 532 and 525nm.The former just overlap with the doubling frequency of YAG laser.Then the doubling frequency YAG laser was used as an excitation source

which have duration about 20 ns and wavelength at λ=532nm.The experimental apparatus of time-resolved spectra are shown in Fig.2.