he fluorescence spectra of GdOBr:Eu were measured and analyzed at room temperature and under high pressure up to 12GPa.43 lines were observed at ambient pressure in the wavenumber of 13000-21500cm

-1

.These lines can be attributed to

5

D

0-2

→

7

F

0-5

transitions of the 4f

6

configuration for GdOBr:Eu.Most of these lines shift to the red with increasing pressure.There are few lines which firstly shift to the blue and thento the red.All these lines become increasingly weaker with increasing pressure.From the fluorescence spectra

26 Stark levels were determined. Under pressures

the

5

D

0-2

Stark levels shift downwards

but the

7

F

0-5

Stark levels shift upwards or downwards irregually.