Photoluminescence in fullerene-doped porous glasses

We report enhanced and broad-band photoluminescence (PL) behavior of C-60 d oped in porous silica glasses. By carrying out photoluminescence and photol uminescence-excitation spectroscopy of C-60 doped in surface-unpassivated a nd -passivated porous glasses, we show that the interaction of C-60. With t he silica surface is quite strong and that the modified C-60 molecules cont ribute only in the orange-red region (similar to 1.9 eV) of the observed PL spectrum. The PL intensity in the blue-green region (similar to 2.3 eV) ob served in doped glasses is found to originate in the porous glass itself.