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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/98513

    Title: Analyzing nanostructures in mesogenic host–guest systems for polarized phosphorescence
    Authors: Tsai, Yu-Tang;Chen, Chien-Yu;Chen, Li-Yin;Liu, Su-Hao;Wu, Chung-Chih;Chi, Yun;Chen, Shaw H.;Hsu, Hsiu-Fu;Lee, Jey-Jau
    Contributors: 淡江大學化學學系
    Keywords: OLEDs;Phosphorescence;Polarized emission;Liquid crystal;GIXS
    Date: 2014-01
    Issue Date: 2014-08-09 16:38:58 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: Feasibility of polarized phosphorescent organic light-emitting devices (OLEDs) had been previously demonstrated by combining a discotic Pt(II) complex with a glassy-nematic oligofluorene host to form a mesogenic host–guest phosphorescent emitting system. Previous photophysical studies suggested that in the host–guest film, the Pt(II) complex tended to aggregate into columnar stacks, exhibiting metal–metal-to-ligand charge transfer (MMLCT) emission. Both host molecules and guest aggregates in the host–guest films could be oriented by a conductive alignment layer, giving rise to polarized phosphorescence from the Pt(II) aggregates. Nevertheless, film morphologies and nanostructures of the mesogenic host–guest systems have remained to be elucidated. In this work, grazing incidence X-ray scattering (GIXS) was carried out to analyze nanostructures in both neat films of the discotic Pt(II) complex and mesogenic host–guest mixture films. In addition, confocal laser scanning microscopy (CLSM) was also utilized for visualization of the morphologies of mesogenic host–guest systems. The columnar axes of nanostructured Pt(II) stacks lying on the alignment-treated surfaces were found to be preferentially oriented perpendicular to the rubbing direction, which is responsible for the observed linearly polarized phosphorescence.
    Relation: Organic Electronics 15(1), pp.311–321
    DOI: 10.1016/j.orgel.2013.11.025
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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