RE glass is a kind of potentiaily valuable luminescent material.More than forty types of various glass doped with various concentration of Ce

3+

Gd

3+

Sb

3+

ions and co-doped with Ce

3+

+Gd

3+

ions were investigated. The influence of glass compositions and concentrations of Sm

3+

ion on the luminescence of Sm

3+

ions and the sensitization effect of Ce

3+

Gd

3+

Sb

3+

and Ce

3+

+Gd

3+

on Sm

3+

ion were also studied.The results indicate that the luminescence of Sm

3+

depends not only on the composition of qlass but also on the concentration of Sm

3+

ion. The concentration quenching occurs at 2wt% of Sm

3+

in borate glass. However

concentration guenching was not found in silicate glass and phosphate glass. It is possible that their critical quenching concentrations are larger than 3wt%. The ions of Ce

3+

Gd

3+

Sb

3+

can sensitize the Sm

3+

luminescence. When sensitized by Ce

3+

Gd

3+

Sb

3+

and Ce

3+

+ Gd

3+

the emission intensity of Sm

3+

increased by a factor of 1.5

2.0

3.7

and 2.6

respectively.