Photoluminescence from fullerene-doped polyvinylcarbazole (PVK) prepared by solution casting under laser irradiation

Photoluminescence (PL) from fullerene (C-60 and C-70)-doped polyvinylcarbaz ole (PVK) films prepared by solution casting under laser irradiation (wavel ength: 488 nm) has been studied. At the beginning of laser irradiation, ful lerene-doped PVK have much stronger and broader PL than pure fullerene-cast ed film and the other fullerene-doped polymers (PMMA, PS, PMPS and PPSQ) du e to the effective energy transfer from WK to fullerene. By analysis of the ir solubility, W-visible absorption spectra and mass spectra before and aft er laser irradiation, PL intensity of fullerene-doped PVK decreases with la ser irradiation time because most fullerene molecules may be bonded with th e carbazole groups of PVK by laser-induced photochemical reaction. (C) 2000 Elsevier Science B.V. All rights reserved.