@article{MakHayerPascuetal.2005,
  author    = {Mak, Chris S. K. and Hayer, Anna and Pascu, S. I. and Watkins, Scott E. and Holmes, Andrew B. and K{\"o}hler, Anna and Friend, Richard H.},
  title     = {Blue-to-green electrophosphorescence of iridium-based cyclometallated materials.},
  issn      = {0022-4936},
  doi       = {10.1039/b508695gb70},
  year      = {2005},
  language  = {en}
}
@article{ParkinsonAharonChangetal.2007,
  author    = {Parkinson, P. and Aharon, E. and Chang, M. H. and Dosche, Carsten and Frey, G. L. and K{\"o}hler, Anna and Herz, L. M.},
  title     = {Dimensionality-dependent energy transfer in polymer-intercalated SnS2 nanocomposites},
  doi       = {10.1103/Physrevb.75.165206},
  year      = {2007},
  abstract  = {We have investigated the influence of dimensionality on the excitation-transfer dynamics in a conjugated polymer blend. Using time-resolved photoluminescence spectroscopy, we have measured the transfer transients for both a three-dimensional blend film and for quasi-two-dimensional monolayers formed through intercalation of the polymer blend between the crystal planes of an inorganic SnS2 matrix. We compare the experimental data with a simple, dimensionality- dependent model based on electronic coupling between electronic transition moments taken to be point dipoles. Within this approximation, the energy-transfer dynamics is found to adopt a three-dimensional character in the solid film and a two-dimensional nature in the monolayers present in the SnS2-polymer nanocomposite.},
  language  = {en}
}
@article{HayerdeHalleuxKoehleretal.2006,
  author    = {Hayer, Anna and de Halleux, Veronique and K{\"o}hler, Anna and El-Garoughy, Abdel and Meijer, E. W. and Barbera, Joaquin and Tant, Julien and Levin, Jeremy and Lehmann, Matthias and Gierschner, Johannes and Cornil, Jerome and Geerts, Yves Henri},
  title     = {Highly fluorescent crystalline and liquid crystalline columnar phases of pyrene-based structures},
  issn      = {1520-6106},
  doi       = {10.1021/Jp0573689},
  year      = {2006},
  abstract  = {A concept for highly ordered solid-state structures with bright fluorescence is proposed: liquid crystals based on tetraethynylpyrene chromophores, where the rigid core is functionalized with flexible, promesogenic alkoxy chains. The synthesis of this novel material is presented. The therniotropic properties are studied by means of differential scanning calorimetry (DSC), cross-polarized optical microscopy (POM), and X-ray diffraction. The mesogen possesses an enantiotropic Col(h) phase over a large temperature range before clearing. The material is highly fluorescent in solution and, most remarkably, in the condensed state, with a broad, strongly red shifted emission. Fluorescence quantum yields (Phi(F)) have been determined to be 70\% in dichloromethane solution and 62\% in the solid state. Concentration- and temperature-dependent absorption and emission studies as well as quantum-chemical calculations on isolated molecules and dimers are used to clarify the type of intermolecular interactions present as well as their influence on the fluorescence quantum yield and spectral properties of the material. The high luminescence efficiency in the solid state is ascribed to rotated chromophores, leading to an optically allowed lowest optical transition},
  language  = {en}
}
@article{MermerVeeraraghavanFrancisetal.2005,
  author    = {Mermer, {\"O}. and Veeraraghavan, G. and Francis, T. L. and Sheng, Y. and Nguyen, D. T. and Wohlgenannt, M. and K{\"o}hler, Anna and Al-Suti, Mohammed K.},
  title     = {Large magnetoresistance in nonmagnetic pi-conjugated semiconductor thin film devices},
  year      = {2005},
  abstract  = {Following the recent observation of large magnetoresistance at room temperature in polyfluorene sandwich devices, we have performed a comprehensive magnetoresistance study on a set of organic semiconductor sandwich devices made from different pi-conjugated polymers and small molecules. The study includes a range of materials that show greatly different chemical structure, mobility, and spin-orbit coupling strength. We study both hole and electron transporters at temperatures ranging from 10 K to 300 K. We observe large negative or positive magnetoresistance (up to 10\% at 300 K and 10 mT) depending on material and device operating conditions. We discuss our results in the framework of known magnetoresistance mechanisms and find that none of the existing models can explain our results.},
  language  = {en}
}
@article{HayerKhanFriendetal.2005,
  author    = {Hayer, Anna and Khan, A. L. T. and Friend, Richard H. and K{\"o}hler, Anna},
  title     = {Morphology dependence of the triplet excited state formation and absorption in polyfluorene},
  year      = {2005},
  language  = {en}
}
@article{KhanSreearunothaiHerzetal.2004,
  author    = {Khan, Amena L. T. and Sreearunothai, Paiboon and Herz, Laura M. and Banach, Michael J. and K{\"o}hler, Anna},
  title     = {Morphology-dependent energy transfer within polyfluorene thin films},
  year      = {2004},
  language  = {en}
}
@article{HayerKoehlerArisietal.2004,
  author    = {Hayer, Anna and K{\"o}hler, Anna and Arisi, E. and Bergenti, I. and Dediu, A. and Taliani, C. and Al-Suti, Mohammed K. and Khan, Muhammad S.},
  title     = {Polymer light-emitting diodes with spin-polarised charge injection.},
  issn      = {0379-6779},
  year      = {2004},
  language  = {en}
}
@article{HahnTscheuschnerSalleretal.2016,
  author    = {Hahn, Tobias and Tscheuschner, Steffen and Saller, Christina and Strohriegl, Peter and Boregowda, Puttaraju and Mukhopadhyay, Tushita and Patil, Satish and Neher, Dieter and B{\"a}ssler, Heinz and K{\"o}hler, Anna},
  title     = {Role of Intrinsic Photogeneration in Single Layer and Bilayer Solar Cells with C-60 and PCBM},
  series = {The journal of physical chemistry : C, Nanomaterials and interfaces},
  volume    = {120},
  journal   = {The journal of physical chemistry : C, Nanomaterials and interfaces},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1932-7447},
  doi       = {10.1021/acs.jpcc.6b08471},
  pages     = {25083 -- 25091},
  year      = {2016},
  language  = {en}
}
@article{SandeeWilliamsEvansetal.2004,
  author    = {Sandee, A. J. and Williams, Charlotte K. and Evans, N. R. and Davies, J. E. and Boothby, C. E. and K{\"o}hler, Anna and Friend, Richard H. and Holmes, Andrew B.},
  title     = {Solution-processible conjugated electrophosphorescent polymers},
  year      = {2004},
  language  = {en}
}
@article{YangVardenyKoehleretal.2004,
  author    = {Yang, C. and Vardeny, Z. V. and K{\"o}hler, Anna and Wohlgenannt, M. and Al-Suti, Mohammed K. and Khan, Muhammad S.},
  title     = {Spectroscopic study of spin-dependent exciton formation rates in pi-conjugated semiconductors : Comparison with electroluminescence techniques},
  year      = {2004},
  abstract  = {It has been found in recent measurements that the singlet-to-triplet exciton ratio in organic light-emitting diodes (OLEDs) is larger than expected from spin degeneracy, and that singlet excitons form at a larger rate than triplets. We employed the technique of optically detected magnetic resonance to measure the spin-dependent exciton formation rates in films of a polymer and corresponding monomer, and explore the relation between the formation rates and the actual singlet-to-triplet ratio measured previously in OLEDs. We found that the spin-dependent exciton formation rates can indeed quantitatively explain the observed exciton yields, and that singlet formation rates and yields are significantly enhanced only in polymer OLEDs, but not in OLEDs made from the corresponding monomer},
  language  = {en}
}