Photoluminescence study of C60 doped polystyrene

Abstract

We report here a new phenomenon in photoluminescence of C60 doped in polystyrene. Under 488 nm cw laser radiation, the PL intensity of the sample was found to increase with time. With 10 h of irradiation, the PL signal strength increased by 10 times, comparable to that from porous Si. The peak of the PL was found to shift to high frequency as well. More detailed studies showed that such an irreversible change of the sample might be a result of the lowering symmetry of oxidized C60 fullerene in the polystyrene.

Light-Induced Inhibition of Photoluminescence Emission of Core/Shell Semiconductor Nanorods and Its Application for Optical Data Storage

“…Among the polymers investigated in that work as host material, C 60 - and C 70 -doped PEMA displayed the greatest PL increase . The authors attributed this finding to the high oxygen permeability of PEMA, as PL increase from fullerene-doped polymers has been associated to photooxidation of fullerenes . This result is important because it provides experimental evidence that oxygen can efficiently diffuse in PEMA, as predicted by the high values of oxygen diffusion and permeability reported in literature for this polymer. − Therefore, our hypothesis on the photooxidation as a possible mechanism for the luminescence inhibition of CdSe/CdS NRs embedded in PEMA seems to be strongly supported by literature.…”

Dielectric Spectroscopy Investigation of Relaxation in C60−Polyisoprene Nanocomposites

“…Due to the low T g of PIP (200 to 210 K), it is difficult to prepare the C 60 −PIP composites through the precipitation methods discussed in ref . Instead, a conventional solvent evaporation approach was used for preparing the C 60 −PIP nanocomposites. ,, A dilute solution of C 60 in toluene was prepared via sonication for 20 min, until a homogeneous, clear solution was obtained. PIP was then added to the solution to achieve the desired C 60 concentration in the final composites.…”

One-pot self-assembly of mesostructured silica films and membranes functionalised with fullerene derivativesElectronic supplementary information (ESI) available: selected analytical data of 2 and 3. See http://www.rsc.org/suppdata/jm/b4/b401916d/

“…After incorporation in a solid matrix, 24 fullerenes exhibit enhanced PL, whose origin has not yet been fully clarified. Several causes were reported in the literature, such as i) quantum confinement effects in silica aerogels, 25 ii) charge and energy transfer in fullerene-doped poly(vinyl)carbazole, 26 iii) laser-induced photo oxidation in fullerene-doped polystyrene 27 or laser-induced photochemical reactions in fullerene-doped methacrylate copolymers. 28 The PL of C 60 after incorporation in sol-gel materials is attributed to the presence of single molecules or clusters, with a number of molecules lower than 10, which are confined within the matrix (quantum confined effect (QCE)).…”