Polymers and liquid crystals

Modulation of optical absorption in poly(diphenylenephthalide) films near the switching threshold

A. N. Lachinov^a, E. R. Zhdanov^b, R. G. Rakhmeev^a, R. B. Salikhov^b, V. A. Antipin<sup>c

a</sup> Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences
^b Bashkir State Pedagogical University n. a. M. Akmulla, Ufa
^c Institute of Organic Chemistry, Ufa Scientific Centre of RAS

Abstract: Optical properties of poly(diphenylenephthalide) nonconjugated polymer films near the electronic switching threshold have been studied by modulation spectroscopy. The measured spectra exhibit specific features in the range of the band gap at $\sim$2.4 eV. The results obtained have been interpreted using quantum-chemical calculations of the electron energy characteristics of the polymer molecule. It has been established that the injection of charge carriers into the polymer film and interaction of this excess charge with the macromolecule can lead to the formation of deep trap states near the center of the band gap.

Received: 09.04.2009
Accepted: 26.05.2009

 English version: Physics of the Solid State, 2010, 52:1, 195–200

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