In:
Journal of Applied Physics, AIP Publishing, Vol. 74, No. 4 ( 1993-08-15), p. 2860-2865
Abstract:
Photoluminescence has been markedly quenched and photoconductivity has been enhanced by more than one order of magnitude upon introduction of several mol% of buckminsterfullerene (C60) to poly(2,5-dialkoxy-p-phenylene vinylene) (RO-PPV), especially at excitations about 2.2 eV, corresponding to the band gap energy of RO-PPV and also in bands at 1.8 and 3.5 eV, which correspond to optical excitation of C60 molecules, suggesting that photo-induced charge transfer occurs between RO-PPV and C60. On the other hand, absorption spectrum and electrical conductivity of RO-PPV have been scarcely influenced by doping of small amount of C60, suggesting that the ground state charge transfer between C60 and RO-PPV is not effective, contrary to the case of poly(3-hexylthiophene). These results are discussed by taking relative electronic energy states of RO-PPV and C60 into consideration. The photo-excited exciton-polaron (Ex-P) in RO-PPV is interpreted to migrate along about 100 monomer units along a polymer main chain in its lifetime and dissociates when encountered with C60. These unique doping characteristics of C60 in RO-PPV are not dependent on the alkyl chain length, contrary to the case of poly(3-alkylthiophene).
Type of Medium:
Online Resource
ISSN:
0021-8979
,
1089-7550
Language:
English
Publisher:
AIP Publishing
Publication Date:
1993
detail.hit.zdb_id:
220641-9
detail.hit.zdb_id:
3112-4
detail.hit.zdb_id:
1476463-5
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