Eu

3+

doped materials has made an important role in the PDP

but the color purity and fluorescent efficiency of the materials now available can not be satisfactory. To look for better materials

the fluorescent properties of Ln

7

O

6

(BO

3

)(PO

4

)

2

:Eu(

Ln

=La

Gd

Y) have been studied. The samples were synthesized by high temperature solid phase technique. The structures of the samples were complicated

it was showed by the infrared absorption spectra that the basic structure unit are [BO

3

]

3-

and [PO

4

]

3-

but because there are interaction between of [BO

3

]

3-

and [PO

4

]

3-

the radius of Eu

3+

ions is different from the La

3+

Gd

3+

Y

3+

ions

and there exists other anion group

etc.

the absorption spectra of Ln

7

O

6

(BO

3

)(PO

4

)

2

:Eu are not entirely the same as that of

Ln

BO

3

and

Ln

PO

4

doped with Eu. The excitation spectra in the region of VUV UV and the emission spectra in the visible region were studied. The excitation spectra are consisted of the Eu

3+

-O

2

charge transfer band and the host absorption band. The location of the Eu

3+

-O

2

charge transfer band shifted to the high energy with the radius of the La

3+

Gd

3+

Y

3+

decreasing; in the excitation spectra of the Gd

7

O

6

(BO

3

)(PO

4

)

2

:Eu and Y

7

O

6

(BO

3

)(PO

4

)

2

:Eu

the ratio between the absorption in the VUV region and in the Eu

3+

-O

2

charge transfer band is higher than that in the La

7

O

6

(BO

3

)(PO

4

)

2

:Eu; there is high absorption at 147nm in the Y

7

O

6

(BO

3

)(PO

4

)

2

:Eu.