OXYGEN EFFECT ON PHOTOLUMINESCENCE OF FULLERITE C60 THIN-FILMS

Luminescence of singlet oxygen at 1287 nm in the C60 solid film with l ongwave and continuous excitation (514.5, 670 and 1064 nm) is studied. The twofold increase of the siglet-oxygen luminescence intensity with excitation at 670 nm in comparison with one at 514.5 nm is observed. A band of photo-luminescence in C60 at 13300 cm-1 is observed. It is f ound that the quantum yield of this luminescence decreases when the ex citation wavelength changes from lambda(i) - 514.5 nm to lambda(i) = 6 47.1 nm. From an analysis of the photoluminescence intensity at evacua ting air we have concluded that oxygen molecules are trapped in a surf ace layer of the C60 solid film.