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Abstract
Photoluminescence investigations have been performed on solid C60, C60/C70 and C70 samples. The photoluminescence spectra of C60 exhibit a main peak at 1.69 eV and well resolved peaks at 1.65 eV, 1.60 eV and 1.5 eV which the authors assign to different phonon replicas. The temperature dependence of the photoluminescence spectrum is also investigated. They find that the 1.77 eV emission peak, which appears at low temperature, clearly originates from C60. The enhancement of this peak seems to be closely related to the amount of C70 existing in C60 samples. In this case C70 acts as an impurity leading to a local distortion of the pure C60 structure.
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