PHOTOLUMINESCENCE OF C-60-DOPED MATRICES

Four matrixes were doped with C-60:nano-ZrO2; nano-Al2O3; nano-SnO2; a nd polystyrene. Under Ar+ laser (476.5 nm) excitation, pure C-60 and t he above matrixes had only weak photoluminescence (PL) in the visible region. However, when the above matrixes were doped with C-60, the PL intensities increased strongly. The PL spectra of C-60-doped matrixes are similar. All spectra show a wide band covering the visible region with intensities from three to ten times stronger than those of the pu re matrixes, respectively. The intensities and peak positions of the s pectra varied for different matrixes and different crystallite sizes. It is probable that the photoluminescence is caused by the optically a ctivated forbidden t(lu)double right arrow h(u) transition of C-60 due to the interaction of C-60 with the matrixes. (C) 1997 American Insti tute of Physics.