Photoluminescence Properties and Preparation of Nanosized Carbon Particles Embedded Gel-Glass

C-nanoparticles embedded xAl2O3· xP2O5.100SiO2 (x=0.25 or 0.5) gel-glasses were prepared by a sol-gel process. The gels synthesized through hydrolysis of PO(OC2H5)3, Al(NO3)3· 9H2O and Si(OC2H5)4, were heated at 600℃ for 10h, in which -- OC2H5 were carbonized to precipitate nanosized C particles. Glasses doped with C nanoparticles showed a strong roomtemperature photoluminescence with a peak at 630um under 532um Nd:YAG laser excitation. The photoluminescence spectra were caused by C nanoparticles embedded gel-glasses.