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note
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We have chosen the full-width at 1/e height to represent the linewidth of the emission spectra because this is more suitable (compared to other definitions such as FWHM) for comparison of disparate emission spectra with varying magnitudes of vibronic features.
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33
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85035173596
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note
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Among the PPV derivatives are several copolymers synthesized from varying ratios of BuEH-PPV and MEH-PFV monomers.
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35
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85035176396
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note
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We thank Z. V. Vardeny for making this point clear.
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36
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85035177492
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note
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Polymer refractive indices were determined from the waveguide modal characterization by the prism coupling technique. We also note that the polymer films are birefringent and have a higher index in the plane of the substrate, which is indicative of partial chain alignment. See (20) for details.
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85035175975
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Although absolute measurements of the PL quantum efficiency are difficult because the films are acting as waveguides, the integrated area of the PL data in Fig. 1 increases sublinearly at high pump energies. This sublinear increase might arise from excitation quenching at high excitation densities above threshold (28).
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85035172491
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note
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We thank G. Yu and Y. Yang (UNIAX Corp.) for valuable assistance and discussions, and UNIAX Corp. for making the Dektak surface profilometer available. Supported by the Office of Naval Research (N00014-91-J-1235). M.A.D.-G. is supported by the Government of Spain. M.R.A. thanks the Swedish Natural Science Research Council for support.
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