Emission of a Single Conjugated Polymer Chain Isolated in Its Single Crystal Monomer Matrix

The excitonic luminescence of a highly ordered single conjugated polymer chain is studied by microphotoluminescence. At T≤10K it consists of a single Lorentzian line. The linewidth increases linearly with T between 6 and 60 K, from 350μeV at 6 K, indicating a pure dephasing time of ~2ps. Above 10 K, other neighboring regions along the chain direction start to emit at a slightly higher (by ~1meV) energy. This indicates very small inhomogeneous broadening, very long chains ( ≥10μm), and a long range and very rapid exciton energy transfer ( >10μm in <100ps).