Interaction of Optical Vibrations With Charge Traps and the Thermoluminescence Spectra of Polymers

Abstract

The energy spectrum of hole traps is investigated in organic polymer poly(di-n-hexylsilane) by the fractional thermally stimulated luminescence (TSL) in the 5-40 K temperature range. In addition, the Raman spectrum of the polymer is studied at 300 K. For the first time, the structure on a TSL curve is observed. It is found that the obtained activation energies of traps coincide with the frequencies of Si-Si vibrations of the polymer chain active in the Raman spectra. These results have been explained within a model, by which the release of charge carriers from traps may be activated via the resonant energy transfer from Si-Si vibrations to the charge carriers. The model explains the appearance of a structure on the TSL curve. K e y w o r d s: poly(di-n-hexylsilane), traps, thermoluminescence, Raman spectra, activation energy.

Exciton condensation in quantum wells. Exciton hydrodynamics. The effect of localized states

“…The qualitative results coincide with the results obtained in [33] using another method from the solution of kinetic equations for level distributions at some simple approximation for the probability transition between the levels. Similar behavior of distribution of free and trapped excitons is observed for another energy dependence of the density of localized states.…”

“…Hydrodynamic equations of excitons were obtained and analysed in the work [32]. Hydrodynamic equations of excitons generalizing the Navier-Stokes equations that take into account the finite exciton lifetime, the pumping of exciton, the existence of an exciton condensed phase and the presence of defects were developed in [33]. In the paper, we make some analysis of these equations.…”