@phdthesis{LorenteSanchez2017,
  author    = {Lorente S{\´a}nchez, Alejandro Jose},
  title     = {Synthesis of side-chain polystyrenes for all organic solution processed OLEDs},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-398006},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xiv, 131},
  year      = {2017},
  abstract  = {In the present work side-chain polystyrenes were synthesized and characterized, in order to be applied in multilayer OLEDs fabricated by solution process techniques. Manufacture of optoelectronic devices by solution process techniques is meant to decrease significantly fabrication cost and allow large scale production of such devices. This dissertation focusses in three series, enveloped in two material classes. The two classes differ to each other in the type of charge transport exhibited, either ambipolar transport or electron transport. All materials were applied in all-organic solution processed green Ir-based devices. In the first part, a series of ambipolar host materials were developed to transport both charge types, holes and electrons, and be applied especially as matrix for green Ir-based emitters. It was possible to increase devices efficacy by modulating the predominant charge transport type. This was achieved by modification of molecules electron transport part with more electron-deficient heterocycles or by extending the delocalization of the LUMO. Efficiencies up to 28.9 cd/A were observed for all-organic solution-process three layer devices. In the second part, suitability of triarylboranes and tetraphenylsilanes as electron transport materials was studied. High triplet energies were obtained, up to 2.95 eV, by rational combination of both molecular structures. Although the combination of both elements had a low effect in materials electron transport properties, high efficiencies around 24 cd/A were obtained for the series in all-organic solution-processed two layer devices. In the last part, benzene and pyridine were chosen as the series electron-transport motif. By controlling the relative pyridine content (RPC) solubility into methanol was induced for polystyrenes with bulky side-chains. Materials with RPC ≥ 0.5 could be deposited orthogonally from solution without harming underlying layers. From the best of our knowledge, this is the first time such materials are applied in this architecture showing moderate efficiencies around 10 cd/A in all-organic solution processed OLEDs. Overall, the outcome of these studies will actively contribute to the current research on materials for all-solution processed OLEDs.},
  language  = {en}
}
@phdthesis{Nothofer2001,
  author    = {Nothofer, Heinz-Georg},
  title     = {Fl{\"u}ssigkristalline Polyfluorene},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-0000039},
  school      = {Universit{\"a}t Potsdam},
  year      = {2001},
  abstract  = {Eine Reihe 9,9-dialkylsubstituierter Polyfluorene mit linearen und verzweigtkettigen Alkylsubstituenten und einem Molekulargewicht von bis zu 200000 g/mol wurde synthetisiert und charakterisiert. Dar{\"u}ber hinaus wurden einige dieser Polymere mit einer geeigneten 'Lochtransport'-Funktionalit{\"a}t (Triphenylamin-Derivate) ausgestattet, um die Ladungstransporteigenschaften und das Molekulargewicht dieser Substanzen zu kontrollieren. Die thermische Orientierung dieser neuen Polymere auf geriebenen Polyimid-Schichten f{\"u}hrte zu hoch anisotropen Filmen mit großen dichroischen Verh{\"a}ltnissen (Absorption parallel und senkrecht zur Reibungsrichtung gemessen). Ferner wurde eine Gruppe chiraler Polyfluorene synthetisiert und hinsichtlich ihrer chiroptischen Eigenschaften untersucht. Der mit diesen chiralen, konjugierten Polymeren erreichte Grad der Anisotropie in Absorption (CD), circular polarisierter Photolumineszenz (CPPL) und Elektrolumineszenz (CPEL) {\"u}berstieg die bis dahin bekannten Werte um einen Faktor von 200.},
  language  = {de}
}