Abstract
We study the interaction of excitons and optical phonons in light-emitting conjugated polymers with the variational approach. The optical transition matrix elements for the phonon sidebands in the absorption and emission spectra are calculated. The electron-phonon coupling constant is determined by fitting the theoretical oscillator strengths of the emission sidebands with the experimental photoluminescence spectra for the various poly( p-phenylene vinylene! derivatives. Using this coupling constant, we predict that the absorption onephonon sideband is as important as the zero-phonon sideband for the ideal systems. Taking the experimental data of the peak absorption coefficient as input, we obtain the optical gain coefficient for a wide range of exciton densities. The gain is found to be determined by the exciton density n0 by a general expression 1.98 310 216 n0 cm 2 , which is in good agreement with experiments. @S0163-1829~99!06243-8#
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
