Conductive phosphate and fluorophosphate glasses with fullerene doping

The appropriate amount of fullerene doping in phosphate and fluorophosphate optical glasses modifies the structures of glass matrices by bonding the n earby -[PO4]- tetrahedra with nonbridging oxygen anions, and consequently b uilding up observable conductivity at room temperature. Non-Arrhenius ionic conductivity is observed, which is interpreted as a result of the temperat ure dependence of the activation energies of the mobile cations. The variat ion of microphotoluminescence induced by the electric field presents us wit h an indirect way to characterize the random activation, percolation migrat ion, and retrap of metal cations near fullerene-related amorphous islands. (C) 2001 American Institute of Physics.