Phys. Rev. B 50, 10769–10779 (1994)Dynamics of singlet excitations in conjugated polymers: Poly(phenylenevinylene) and poly(phenylphenylenevinylene)Received 5 July 1994; published in the issue dated 15 October 1994 The decay of the photoluminescence of the conjugated polymers, poly(phenylenevinylene), poly(phenylphenylenevinylene) (PPV), and PPPV blended with polycarbonate is measured as a function of the position of the spectral detection window employing frequency-up-conversion and streak-camera techniques. Upon probing at the high-energy side of the inhomogeneously broadened S1←S0 0-0 transition, an initial falloff characterized by a (1/e) decay time of about 300 fs is observed. This decay slows down by three orders of magnitude upon shifting the detection window towards lower energies. We present a quantitative analysis of these experimental data by performing simulations of dipole-dipole excitation transfer on a random lattice chain with energetic site disorder. They give evidence for the notion that photon absorption generates neutral excitation undergoing a random walk among segments of the polymer chain with different excitation energies. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.50.10769
DOI:
10.1103/PhysRevB.50.10769
PACS:
78.47.+p, 78.55.Kz, 78.66.Qn
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