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28 November 1994 Photoluminescence and PL-detected magnetic resonance of C60 and C70
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The X-band photoluminescence detected magnetic resonance (PLDMR) of C60 and C70 films and molecules isolated in toluene/polystyrene glasses is described. Both fullerene glasses have a PLDMR due to a triplet exciton delocalized over the entire molecule. However, the PLDMR of 3C70 strikingly differs from that of 3C60 in both lineshape and dynamics. These differences are due to the much longer lifetime of 3C70 which is consequently phosphorescent. The PLDMR of films indicates that the delocalized triplet is distorted by intermolecular interactions and reveals a half-field resonance consistent with triplet-triplet fusion. In addition, a broad approximately 600 G wide triplet powder pattern at g approximately equals 2, its half-field resonance at g approximately equals 4, and a narrow PL-enhancing resonance at g equals 2.0017 and 2.0029 for C60 and C70, resp., are observed. This second triplet is believed to be localized on a pentagon or hexagon face adjacent to a neighboring molecule. A narrow (approximately 3.3 G wide) PL-enhancing resonance is attributed to recombination of long-lived charged polarons. The PLDMR of photooxidized and photopolymerized films of C60 and C70 is also described. Both processes quench the localized triplet, but PLDMR spectrum of photopolymerized C60 films reveal the presence of a third triplet exciton delocalized across several molecules.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. A. Lane and Joseph Shinar "Photoluminescence and PL-detected magnetic resonance of C60 and C70", Proc. SPIE 2284, Fullerenes and Photonics, (28 November 1994);

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