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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2007. V. 10, N 4. P. 067-071.
Radiative recombination of PVC/C60 molecular complexes
with radiation-induced damages
Taras Shevchenko Kyiv National University, Departments of Physics1, Biophysics2 and Chemistry of High-Molecular Compounds3, 64, Volodymyrska str., 01033 Kyiv, Ukraine
Abstract. The relaxation processes of electronic excitations in the films composed from
a mixture of the amorphous semiconductors of polyvinylcarbazole and C 60 fullerenes
(PVC/C 60 ) with different contents of nanocluster molecules and beyond the threshold
electron irradiation are studied. It is shown that, in the entire range of the concentrations
of C 60 molecules, for which the molecular disperse state of a mixture retains, the
complexes with the charge transfer due to the photogeneration of electron-hole pairs are
observed in the PVC/C 60 films. The photoluminescence spectra indicate the presence of
both the molecular emitting transitions and the recombination luminescence caused by
the electron transfer in the composition of excitons from the matrix to impurity
fullerenes. Depending on the content of C 60 molecules, the photoluminescence spectra
are substantially reconstructed, reflecting the changes in the electron structure of
molecular complexes. The nature of these changes retains with the introduction of
radiation-induced damages under high-energy electron irradiation with an absorbed dose
of 3.0 MGy.
Keywords: electronic excitation, photogeneration, photoluminescence, complexes with
the charge transfer, electron irradiation.
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