Correlation between real inhomogeneous widths of zero-phonon absorption components and intermolecular interactions for dye-doped polymers

Abstract

We measured the real inhomogeneous widths of the distribution composed of purely electronic zero-phonon absorption components alone by using persistent spectral hole-burning of tetraphenylporphine doped in several polymers. The correlation between the inhomogeneous widths and the dye-polymer intermolecular interactions is discussed by using a statistical theory. From the results, the main contribution to the inhomogeneous broadening is evaluated to be the van der Waals interaction, and the contribution of the dipole-dipole interaction increases with the polarity of polymers. We also evaluated a linear correlation between the inhomogeneous widths and the solubility parameters of the polymers, which express the strength of the intermolecular interactions.