@article{BagnichBasslerNeher2005,
  author    = {Bagnich, Sergey A. and Bassler, H. and Neher, Dieter},
  title     = {Exciton dynamics in ladder-type methyl-poly(para-phenylene) doped with phosphorescent dyes},
  issn      = {0022-2313},
  year      = {2005},
  abstract  = {The luminescence of a ladder-type methyl-poly(para-phenylene) (MeLPPP) doped with platinum-porphyrin dye PtOEP covering the concentration 10(-3)-5\% by weight has been measured employing cw and transient techniques. Upon excitation into the range of absorption of the host, strong phosphorescence of the dopant is observed. Possible ways of populating the dopant triplet state are considered. (c) 2004 Elsevier B.V. All rights reserved},
  language  = {en}
}
@article{RomanovskiiBasslerScherf2004,
  author    = {Romanovskii, Y. V. and Bassler, H. and Scherf, Ullrich},
  title     = {Relaxation processes in electronic states of conjugated polymers studied via spectral hole-burning at low temperature},
  issn      = {0009-2614},
  year      = {2004},
  abstract  = {Persistent and transient hole-burning (HB) at 4.2 K have been applied to study the intrinsic properties of electronic excitations of a ladder type pi-conjugated poly(para-phenylene) in solutions. A narrow spectral hole less than I meV wide has been detected. The dependencies of the HB efficiency on the burn dose and wavelength, on doping the samples by electron scavenger are interpreted in terms of a photo reaction related to the two-level systems - specific low energy excitations in amorphous materials. In transient HB an additional hole broadening was observed which stems from the triplet energy transfer under conditions of lack of correlation of site energies of the singlet and triplet states of chromophores. (C) 2003 Elsevier B.V. All rights reserved},
  language  = {en}
}
@article{BagnichBasslerNeher2004,
  author    = {Bagnich, Sergey A. and Bassler, H. and Neher, Dieter},
  title     = {Sensitized phosphorescence of benzil-doped ladder-type methyl-poly(para-phenylene)},
  issn      = {0021-9606},
  year      = {2004},
  abstract  = {The delayed luminescence and phosphorescence of ladder-type methyl-poly(para-phenylene) (MeLPPP) doped with benzil at a concentration of 20\% by weight has been measured. The introduction of benzil leads to a dramatic reduction of the polymer singlet emission. At the same time, a new band with maximum at 611 nm appears, corresponding to the phosphorescence of MeLPPP. The phosphorescence decay on the short time scale is close to an exponential law with a time decay of 15 ms. This indicates that benzil can efficiently sensitize the phosphorescence of the polymer. In addition, a broad and featureless emission is observed in the delayed luminescence spectra of benzil-doped MeLPPP, which is attributed to an exciplex formed between the polymer host and the dopant. We further observe that the delayed fluorescence is enhanced by the addition of benzil. It is concluded that the delayed fluorescence of benzil-doped MeLPPP is mainly due to the annihilation of triplet excitons on the polymer. Finally, efficient triplet-triplet energy transfer from the benzil-doped polymer to the red-emitting phosphorescent dye Pt(II)octaethylporphyrin is established. (C) 2004 American Institute of Physics},
  language  = {en}
}
@article{BagnichImBassleretal.2004,
  author    = {Bagnich, Sergey A. and Im, C. and Bassler, H. and Neher, Dieter and Scherf, Ullrich},
  title     = {Energy transfer in a ladder-type methyl-poly(para-phenylene) doped by Pt(II)octaethylporphyrin},
  issn      = {0301-0104},
  year      = {2004},
  abstract  = {The luminescence of a ladder-type methyl-poly(para-phenylene) (MeLPPP) doped by platinum-porphyrin dye PtOEP covering the concentration 10(-3) to 5\% by weight has been measured employing cw and transient techniques. Upon excitating into the range of absorption of the host strong phosphorescence of the dopant is observed. Possible ways of populating of the dopant triplet state are considered. It is shown that the main channel is singlet-singlet energy transfer among chromophor groups of the polymer followed by Forster-type transfer to the guest and subsequent intersystem crossing. (C) 2003 Elsevier B.V. All rights reserved},
  language  = {en}
}