Dependency of non-homogeneity energy dispersion on absorbance line-shape of luminescent polymers

作者：da Silva Marcelo Castanheira^*; Santos Silva H; Silva R A; Marletta Alexandre

来源：Chemical Physics, 2013, 411: 35-42.

DOI：10.1016/j.chemphys.2012.10.011

• Luminescent polymers
• Absorption line-shape
• Non-homogeneity energy dispersion

In this paper, we study the importance of the non-homogeneity energy dispersion on absorption line-shape of luminescent polymers. The optical transition probability was calculated based on the molecular exciton model, Franck-Condon states, Gaussian distribution of non-entangled chains with conjugate degree n, semi-empirical parameterization of energy gap, electric dipole moment, and electron-vibrational mode coupling. Based on the approach of the energy gap functional dependence 1/n, the inclusion of the non-homogeneity energy dispersion 1/n(2) is essential to obtain good experimental data agreement, mainly, where the absorption spectra display peaks width of about 65 meV. For unresolved absorption spectra, such as those observed for a large number of conjugated polymers processed via spin-coating technique, for example, the non-homogeneity energy dispersion parameterization is not significant. Results were supported by the application of the model for poly (p-phenylene vinylene) films.

• 出版日期2013-1-16