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Increase of photoluminescence from fullerene‐doped polymers under laser irradiation
Author(s) -
Li G. Z.,
Minami N.,
Ichio Y.
Publication year - 2001
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10856
Subject(s) - materials science , fullerene , photoluminescence , polymer , polystyrene , irradiation , photochemistry , methyl methacrylate , doping , laser , fullerene chemistry , polymer chemistry , analytical chemistry (journal) , organic chemistry , optoelectronics , polymerization , composite material , optics , chemistry , physics , nuclear physics
Photoluminescence (PL) from fullerene (C 60 and C 70 )‐doped polymers such as poly(methyl methacrylate) (PMMA), polystyrene (PS), poly(methyl phenyl silane) (PMPS) and poly(phenyl silsesquioxane) (PPSQ) increases gradually under laser irradiation in air (but not in vacuum and in nitrogen) and eventually becomes visible to the naked eye. Concomitantly, the PL peak is broadened and, in most cases, blue‐shifted. No such PL increases are observed for pure C 60 films made by vacuum vapor deposition and pure polymer films. Among the polymers used, fullerene‐doped PMMA has the greatest PL increase after several hours of laser irradiation and fullerene‐doped PMPS has the highest rate of PL increase at the initial stage of the laser irradiation. To gain an insight into the mechanism of the PL increase, laser‐irradiated fullerene‐doped PMMA samples were analyzed by UV‐Vis spectrophotometer, FT‐IR, mass spectrometry, GPC and NMR. The results show that the PL increase can be attributed to CH 60 O n ‐polymer (or C 70 O n ‐polymer) and oxidized fullerene‐polymer adducts formed by some laser‐induced photochemical reactions among fullerenes, oxygen and polymers.