TIME DECAY BEHAVIOR OF FULLERENE-C₆₀ STUDIED BY TIME-RESOLVED PHOTOLUMINESCENCE

The time-resoved photoluminescence spectra of C₆₀ have been studied from toluence solution at room temperature and from thin film at both room temperature and 77K. A photoluminescence peak at about 730nm was detected from solution at room temperature and film at 77K, in which lifetimes waz determined to be 1.1 and 0.9ns, respectively. At room temperature, the photoluminescence peak of thin film shifted to 740 nm with fast decay behavior which was fitted well to a double-exponential lifetimes with \tau₁ = 0.087ns, \tau₂= 0.68 ns. Two relaxation mechanisms are given tentatively in explaining this phenomenon.