PHOTOLUMINESCENCE OF SOLID C-60 POLYMERIZED UNDER HIGH-PRESSURE

Photoluminescence (PL) spectra were measured on the C-60 polymeric pha se prepared from a single crystal and from a microcrystalline powder t reated at pressures to 15 kbar and temperatures to 600 K. It was found that the high-pressure treatment resulted in a shift of the spectral intensity distribution to lower energies compared to the well-known sp ectrum of pristine C-60. A set of new lines was observed. The PL spect rum of the high-pressure phase exhibited a distinct structure contrary to that of photopolymerized C-60 The PL intensity of the high-pressur e phase showed a non-monotonic temperature dependence with a slight mi nimum around 150 K. (C) 1997 Published by Elsevier Science B.V.