Semiconductor Physics, Quantum Electronics & Optoelectronics. 2007. V. 10, N 4. P. 067-071.

Radiative recombination of PVC/C60 molecular complexes with radiation-induced damages
Е.S. Kоbus1, О.P. Dmytrenko1, N.P. Kulish1, Yu.I. Prylutskyy2, N.М. Belyy1, V.G. Syromyatnikov3, S.L. Studzinskyy3, М.А. Zabolotnyy3, D.А. Gryn’ko4, D.V. Shchur5, V.V. Shlapatskaya6

Taras Shevchenko Kyiv National University, Departments of Physics1, Biophysics2 and Chemistry of High-Molecular Compounds3, 64, Volodymyrska str., 01033 Kyiv, Ukraine
4V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 45, prospect Nauky, 03028 Kyiv, Ukraine
5Institute for Problems of Materials Science, NAS of Ukraine, 3, Krzhyzhanovsky str., 03142 Kyiv, Ukraine
6Institute of Physical Chemistry, NAS of Ukraine, 31, prospect Nauky, 03028 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.

Full Text (PDF)

Back to N4 Volume 10