Photoluminescence and its temperature dependence of phosphate and fluorophosphate optical glasses doped with fullerenes

Microphotoluminescence is studied for fullerene-doped phosphate and fluorop hosphate optical glasses, where microstructures are formed by connecting ne arby -[PO4]- tetrahedra with chemical bonds between fullerenes and non-brid ging oxygen anions. Fullerene-related tetrahedral chains result in signific ant changes of photoluminescence. Scanning photoluminescence measurements i ndicate that a large number of fullerene-related microdomains aggregate as self-organized islands. The temperature dependence of the photoluminescence demonstrates that the non-radiative decay and ionic environments of fuller ene complexes are different at the various temperatures. The changes of the ionic environments and anionic potentials of the fullerene complexes are c aused by laser excitation induced activation of cations followed by their p ercolation migration and retrapping in the vitreous matrix.