1D exciton band and exciton-phonon interaction in a single polymer chain

TL;DR

This study investigates the excitonic luminescence of isolated polymer chains, revealing their 1D excitonic behavior and the impact of phonon interactions on their spectral properties.

Contribution

It provides experimental evidence of 1D excitonic density of states and quantifies exciton-phonon interactions in a single polymer chain.

Findings

Chains exhibit 1/sqrt{E} density of states between 5 and 50 K

Homogeneous width variation explained by acoustic phonon interaction

Experimental confirmation of 1D excitonic system behavior

Abstract

The excitonic luminescence of an isolated polydiacetylene polymer chain in its monomer matrix is studied by micro-photoluminescence. These chains behave as perfect 1D excitonic systems with the expected 1/sqrt{E} density of states between 5 and 50 K. The temperature dependence of the homogeneous width is quantitatively explained by interaction with longitudinal acoustic phonons of the crystal in the range of temperature explored.