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Sökning: WAKA:ref > Inganäs Olle > Lunds universitet > Zigmantas D.

  • Resultat 1-3 av 3
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  • Theander, M., et al. (författare)
  • Interchain photoluminescence in substituted polyfluorenes
  • 2001
  • Ingår i: Synthetic metals. - 0379-6779. ; 119:1-3, s. 615-616
  • Tidskriftsartikel (refereegranskat)abstract
    • We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.
  • Theander, M, et al. (författare)
  • Photoluminescence quenching at a polythiophene/C-60 heterojunction
  • 2000
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - American Physical Society. - 1098-0121. ; 61:19, s. 12957-12963
  • Tidskriftsartikel (refereegranskat)abstract
    • Quenching of photoluminescence in a substituted polythiophene in the presence of a deposited C-60 layer is studied by steady-state and time-resolved photoluminescence (PL). The steady-state PL is evaluated by con -sidering the interference of the absorbed and emitted electro-optical field in the thin film coupled to exciton diffusion in the conjugated polymer. PL quenching occurs for excitons generated within 5 nm from the heterojunction. A blueshift of the polymer emission spectrum is observed when C-60 is deposited on top of a polymer thin film. The blueshift is shown to be caused by PL quenching before the excitation is transferred to the lowest-energy sites.
  • Zaushitsyn, Y., et al. (författare)
  • Ultrafast light-induced charge pair formation dynamics in poly[3-(2'-methoxy-5' octylphenyl)thiophene]
  • 2004
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121. ; 70:7
  • Tidskriftsartikel (refereegranskat)abstract
    • Charge pair photogeneration was investigated by ultrafast absorption spectroscopy for different excitation photon energies in poly[3-(2'- methoxy-5' octylphenyl)thiophene] (POMeOPT) film with and without an external electric field. Electric field-assisted charge pair photogeneration in POMeOPT occurs from vibrationally relaxed singlet excitons during their entire lifetime and charge pair formation takes place in this manner even in the absence of an external electric field. From our data there are no indications of hot exciton dissociation to charge pairs even when a large amount of excess energy is supplied to the excitons. To explain these observations we present a model with energy transfer to low-barrier dissociation sites as a key feature.
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