New organic materials for light emitting devices based on dihexylfluorene-co-ethylenedioxythiophene copolymers exhibiting improved hole-injecting properties
作者： Olivier Stéphan , Francois Tran-Van , Claude Chevrot
DOI: 10.1016/S0379-6779(02)00123-6
关键词: Indium tin oxide 、 OLED 、 Fluorene 、 Copolymer 、 Luminescence 、 Conductive polymer 、 PEDOT:PSS 、 Chemical engineering 、 Polymer chemistry 、 Materials science 、 Electroluminescence
摘要: We report the synthesis, optical and electrochemical characterisations of 9,9-di-n-hexylfluorene-co-3,4-ethylenedioxythiophene (DHF-coEDOT) copolymers obtained from a mixture, in various ratios, two corresponding dibrominated monomers by dehalogenative polycondensation. Elemental analysis, IR studies coupled with 1 H NMR clearly indicate, as expected, that amount each monomer unit final materials is strongly correlated feed composition even though reactivity EDOT seems lower than DHF. It appears low content, i.e. 11‐15 mol%, within PDHF main chain, leading to copolymer COPO1, caused significant changes electronic properties material when compared homopolymer. Higher contents lead less soluble which are not suitable for investigation their use luminescent semiconducting p-conjugated organic light emitting diodes (OLEDs). Green devices based on COPO1 have been investigated showed improved hole injection The origin emitted has attributed concomitant emission aggregates segments short oligomeric segments. an additional poly(3,4-ethylenedioxythiophene-2,5-diyl) (PEDOT)‐polystyrene sulfonate (PSS) layer indium tin oxide (ITO) anode also leads operating lifetime. # 2002 Elsevier Science B.V. All rights reserved.
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