NANOSECOND-GATED DETECTION OF ROOM-TEMPERATURE FLUORESCENCE OF C60 INSOLUTION

Fluorescence spectra of C60 in n-hexane at room temperature, obtained under excitation at 514.5 and 337.1 nm, are presented. The spectra wer e measured with subnanosecond laser excitation in a 5-ns gate synchron ous with the excitation. The emission, in the range 1.5 to 2.2 eV for excitation at 514.5 nm (2.41 eV), is characterized by a narrow peak at 2.05 eV (i.e., 606 nm, 7.2 nm FWHM) which is predominant in the spect rum, while many resolved vibronic structures emerge, down to energies as low as 0.4 eV, in the spectrum obtained with excitation at 337.1 nm (3.68 eV).