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- W2000515998 abstract "We have measured the time response of photoluminescence intensity in poly(di-$n$-hexylsilane) films at 2 K with excitation densities from $1.2ifmmodetimeselsetexttimesfi{}{10}^{17}$ to $1.1ifmmodetimeselsetexttimesfi{}{10}^{19}$ excitons ${mathrm{cm}}^{ensuremath{-}3}.$ At the highest density, the photoluminescence has a rise time of 1.4 ps, which is ascribed to the exciton-exciton scattering time between initially photogenerated excitons. The inverse of rise times are sublinear to the excitation densities. The decay profiles are explained by the exciton-exciton annihilation with a rate constant of $(1.0ifmmodepmelsetextpmfi{}0.5)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8} {mathrm{cm}}^{3} {mathrm{s}}^{ensuremath{-}1}.$ These processes are discussed in terms of exciton wave functions obtained by the one-dimensional Frenkel exciton model with disorder. We propose directional relaxation of excitons toward interacting points between different polymer chains as a mechanism for the efficient exciton-exciton annihilation." @default.
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- W2000515998 date "2001-08-29" @default.
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- W2000515998 title "Exciton-exciton scattering in disordered linear chains of poly(di-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>n</mml:mi></mml:math>-hexylsilane)" @default.
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- W2000515998 doi "https://doi.org/10.1103/physrevb.64.115417" @default.
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