There have probably been more spectrascopic investigations involving Eu

3+

reported in the last few years than those of any other Ianthanide.This reflects

of course

the importance of Eu

3+

-activated phosphors and the interest in Eu

3+

-based lasers. The volume of work is more remarkable when one realizes that practically all of these investigations are concerned with transitions or fluorescence from several 5D level in the visible region of spectra.This paper reports some results of such an investigation. The growth of GdP

5

O

14

(GdPP):Eu

3+

single crystals was studied by hydrothermal method.The excitation

emission

absorption and infrared spectra of the crystals wers measured at room temperature and analyzed. Most of the observed emissions and absorptions can be uniquely assigned in terms of specific transition between levels in the 4f shell of Eu

3+

ions

and conversely most of predicted transition were obverved.The symmetry-determined electric and magnetic dipole selection rules for the C

2

site symmetry are quite well for Eu

3+

ions to obey. The strongest absorption at 394nm and the weak sharp band at 361nm could immediately be assigned to transition from

7

F

0

to

5

L

6

and

5

D

4

respectively. The

7

F

0

-

5

D

3

transition was placed at 4l3nm.The bands at 462nm and 522nm identified by their close correlation with transition observed for Eu

3+

in the GdPP:Eu crystals are assigned for

7

F

0

-

5

D

2

and

5

D

1

as has been shown experimentally that the intensity of band at 522nm (

7

F

0

-

5

D

1

) arises entirely via the magnetic dipole mechanism.