We have systematically studied the interaction between Ce

3+

and Tb

3+

ions in LaOBr: Ce

3+

Tb

3+

. We have measured emission spectra of a series of samples with the model MPF-4 spectrometer.The excitation wavelength is 337nm.The emission spectra of LaOBr:Tb

3+

consist of the

5

D

3

-

7

F

J

and

5

D

4

-

7

F

J

(J=0

1

2

…

6) transitions. The main characteristic lines in these two groups are

5

D

3

-

7

F

J

(415.9nm

436.6nm) and

5

D

4

-

7

F

J

(485.4nm

543.1nm) transitions. In the emission spectra of the LaOBr: Ce

3+

Tb

3+

there are not only the emission band of the Ce

3+

but also the

5

D

3

-

7

F

J

and

5

D

4

-

7

F

J

transitions of the Tb

3+

ion when xce≤3×10

-4

. But the emission intensity of the Tb

3+

ion is about 15-25 times higher than that of the sample without Ce

3+

ion.The emission spectra of the LaOBr:Ce

3+

Tb

3+

consist of the emission band of the Ce

3+

ion and the emission lines of the Tb

3+

ion

which is only

5

D

4

-

7

F

J

when

x

Ce

>

3×10

-3

. The emission intensity of the Tb

3+

ion (

5

D

4

-

7

F

J

) increases with the increasing Ce

3+

concentration.