Förster transfer based amplified spontaneous emission in conjugated polymer blends
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Intrinsic gain and gain degradation modulated by excitation pulse width in a semiconducting conjugated polymer
2017, Optics and Laser TechnologyCitation Excerpt :For example, using planar waveguide structures formed by spin-casting thin films of MEH-PPV onto oxidized porous silicon substrates, Lahoz et al. [9] demonstrated that the amplified spontaneous emission (ASE) threshold could be controlled by changing the porosity, and hence refractive index, of the silicon substrate layer. Another effective approach for controlling the photophysical properties of conjugated polymers relies on host-guest chemistry, whereby excited states initially formed in an absorbing host are transferred non-radiatively to an emitting guest via long-range dipole-dipole interactions [10]. This cascade Forster transfer of energy shifts the emission spectrum to longer wavelengths, further from the absorption edge, leading to lower self-absorption losses and thus lower ASE thresholds.
Förster-type energy transfer mechanism in PF<inf>2/6</inf> to MEH-PPV conjugated polymers
2012, Journal of LuminescenceCitation Excerpt :Nevertheless, the Förster transfer rate equation has been widely used to explain energy transfer phenomena in molecular dye systems [11,12], photosynthetic aggregates [13,14], as well as in polymer blend systems [15–18]. In the later systems three different methods have been employed to calculate the Förster radius, namely, the PL quantum efficiency [16], spectral overlap [16] and a direct measurement of the energy transfer rate [17,19]. All methods require that the polymer molecules are approximated to hard spheres so that the concentration of a particular blend can be related to the intermolecular separation of the donor and the acceptor.
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