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