Slica-based composite materials incorporated with a terbium bipyridyl complex, SiO2:Tb(bpy)(2)(3+), were prepared by a sol-gel method. The thermal stability of Tb(bpy)(2)(3+) was improved by incorporation into the silica matrix, and its green emissiom lines were intensified by beat-treatments under appropriate temperature conditions. These results demonstrate that the composite materials such as SiO2:Tb(bpy)(2)(3+) possess potential as efficient phosphors.