C-nanoparticles embedded xAl(2)O(3) . xP(2)O(5) . 100SiO(2) (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) . 9H(2)O and Si(OC2H5)(4), were heated at 600 degrees C for 10h, in which - OC2H5 were carbonized to precipitate nanosized C particles. Glasses doped with C nanoparticles showed a strong room-temperature photoluminescence with a peak at 630nm under 532nm Nd:YAG laser excitation. The photoluminescence spectra were caused by C nanoparticles embedded gel-glasses.