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(a) Repeat unit of the poly[9,9-bis(-[(N,N-dimethyl)-N-ethylammonium]-propyl)-2,7-fluorene-alt-1,4-phenylene] dibromide (PDFD). (b) Schematic representation of a CdTe NC capped with thioglycolic acid. (c) Schematic representation of a hybrid LbL PDFD/NC nanocomposite. (d) Steady-state absorption (solid lines) and PL (dashed line) spectra at the excitation wavelength of 370 nm. (e) PLE spectra at the emission wavelength of 650 nm. PDDA/NCs composite—squares, PDFD/NC composite—circles. The absorption and PLE spectra of the PDDA/NCs composite are normalized at the wavelength of 470 nm to the corresponding values of the PDFD/NC spectra.
(a) Energy transfer efficiency (squares) and quenching efficiency of the PDFD (triangles) in the PDFD/NC composite vs temperature. (b) Ratios of the ET rate to the radiative rate (stars) and of the nonradiative rate to the radiative rate (circles) of the PDFD within the PDFD/NC composite as a function of temperature. The curves are normalized to unity at .
Intrinsic quantum efficiency vs temperature of the PDFD within nanocomposites with different morphologies: PDFD/NC LbL composite (circles), PDFD/PSS LbL composite (triangles), and bare PDFD layer (squares). The curves are normalized to unity at . The solid curves are results of an Arrhenius global data fit. The insets schematically illustrate corresponding nanostructures and volumes available for exciton diffusion (shaded regions).
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