The luminophors of Bi

3+

-doped and Bi

3+

Eu

3+

-co-doped Ca

2

SiO

4

were sythesised. The crystalline phase was checked by X-ray powder diffraction. By contrast

the d values of crystallogram are in agreement with that of ASTM file No.9-351. Therefore the products were determined to be mono-clinic 3-Ba

2

SiO

4

. The excitation and emission spectra were measured by RF-510 fluorospectrometer.The luminescent properties of Ca

2

SiO

4

:Bi

3+

and Ca

2

SiO

4

:Eu

3+

Bi

3+

were investigated.We have found that Ca

2

SiO

4

:Bi

3+

shows bright indigo-blue luminescence with max about 410nm under UV excitation. There are two bands in its excitation spectra

λ

max

=314nm and λ

max

=352nm respectively. When Bi

3+

concentration increases

the excitation band of 314nm decreases rapidly and that of 352nm increases fast

and the ratio of the two band areas shows a linear relationship. The optimum concentration of Bi

3+

ion for Ca

2

SiO

4

is 0.02mol corresponding to 352nm excitation.The excitation spectra of Eu

3+

emission for Ca

2

SiO

4

:Eu

3+

Bi

3+

appear a powerful broad band of Bi

3+

with maximum value of 355nm besides excitation lines of Eu

3+

. Under excitations of 340nm

355nm and 365nm UV radiation

the emission of Eu

3+

(

6

D

0

-

7

F

1

5

D

0

-7F

2

transition) for Ca

2

SiO

4

:Eu

3+

Bi

3+

is increased more greatly than that of Ca

2

SiO

4

:Eu

3+

. Moreover

there is an intensive emission of Bi

3+

with the maximum value of 390nm.Using 340nm UV radiation as excitation

Ca

2

SiO

4

:Eu

3+

Bi

3+

shows intensive emissions of Eu

3+

corresponding ton

5

D

0

-

7

F

1

and

5

D

0

-7F

2

transitions

but Ca

2

SiO

4

:Eu

3+

shows little emission under the same conditions. Results of these experiments show that there are energy transfer from Bi

3+

ions to Eu

3+

ions.Because the band overlapping of the emission band of Bi

3+

with excitation lines of Eu

3+

is in good condition

evidently

energy transfer from Bi

3+

ions to Eu

3+

ions is the cause of luminescence of Eu

3+

sensitized by Bi

3+