Gd

2

O

3

:(Ce

3+

Eu

3+

) is a potential luminescent material which can act both in fundamental research and application. In the past two years

Wegh et al. realized the quantum cutting grounded on the energy transfer between some rare earth ions such as Gd

3+

Eu

3+

Gd

3+

Er

3+

and so on

the quantum efficiency approximates to 200%. So we investigated the energy transfer in Gd

3+

Ce

3+

Eu

3+

system

prepared for the design of the new type materials based on effective quantum cutting. Gd

2

O

3

:(Ce

3+

Eu

3+

) micro crystals were prepared by the sol-gel method. The samples were checked to be pure cubic phase by X-ray powder diffraction

the mean size of particles is about 400nm. The excitation spectra of Ce

3+

(

em

=450nm) and Eu

3+

(

em

=619nm) in the UV range were researched

and the emission spectra of Ce

3+

and Eu

3+

were measured with UV excitation respectively. The results showed that the energy transfer between Gd

3+

and Ce

3+

Gd

3+

and Eu

3+

Ce

3+

and Eu

3+

correspond to the energy transfer from

8

S

7/2

6

D

J

and

8

S

7/2

6

I

J

(Gd

3+

) to 4f (

2

F

7/2

2

F

5/2

)5d (Ce

3+

)

from

8

S

7/2

6

D

J

and

8

S

7/2

6

I

J

(Gd

3+

) to 7F 1

2

3

4

5

D

0

(Eu

3+

)

and from 5d4f(

2

F

7/2

2

F

5/2

) (Ce

3+

) to 7F 1

2

3

4

5

D

0

(Eu

3+

)

respectively. We also made use of synchrotron radiation light to detect the excitation spectra of Gd

2

O

3

:(Ce

3+

Eu

3+

) in the UV VUV range

and the emission spectra with VUV (180nm) excitation. The emission spectra of Ce

3+

(

em

=450nm) was decomposed to four sub bands with UV excitation

while it was decomposed to two sub bands under VUV excitation. These results indicate that Ce

3+

substituted for Gd

3+

and located in two kinds of different sub lattices. Gd

3+

can transfer energy to two kinds of different sub lattices effectively

while the host just can transfer energy to one kind of different sub lattices. The energy transfer from

8

S

7/2

6

D

J

and

8

S

7/2

6

I

J

(Gd

3+

) to 4f (

2

F

7/2

2

F

5/2

)5d (Ce

3+

)

and from 5d4f(

2

F

7/2

2

F

5/2

) (Ce

3+

) to

7

F 1

2

3

4

5

D

0

(Eu

3+

) occurred simultaneously

so it is concluded that the cascade energy transfer Gd

3+

Ce

3+

Eu

3+

exists in Gd

2

O

3

:(Ce

3+

Eu

3+

) micro crystals.