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    National Tsing Hua University Institutional Repository > 歷任校長 > 劉兆玄 (1987-1993) > 期刊論文 >  Rational Color Tuning and Luminescent Properties of Functionalized Boron-Containing 2-Pyridyl Pyrrolide Complexes


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81130


    Title: Rational Color Tuning and Luminescent Properties of Functionalized Boron-Containing 2-Pyridyl Pyrrolide Complexes
    Authors: Chen, H.-Y.;Chi, Y.;Liu, C.-S.;Yu, J.-K.;Chen, K.-S.;Chou, P-T.;Peng, S.-M.;Lee, G.-H.;Carty, A. J.;Yeh, S-J.;Chen, C.-T.
    教師: 劉兆玄
    Date: 2005
    Publisher: Wiley-VCH Verlag Berlin
    Relation: ADVANCED FUNCTIONAL MATERIALS, Wiley-VCH Verlag Berlin, Volume 15, Issue 4, APR 2005, Pages 567-574
    Keywords: LIGHT-EMITTING-DIODES
    PHOTOINDUCED ELECTRON-TRANSFER
    ORGANIC ELECTROLUMINESCENCE
    DIPYRROMETHENE DYE
    OPTICAL-PROPERTIES
    PYRIDINE
    SYSTEMS
    APPROXIMATION
    PERFORMANCE
    OLIGOMERS
    Abstract: Three systematically functionalized pyrrolide ligands were prepared via the coupling of methyl vinyl ketone and the respective carbaldehyde reagents, followed by treatment of the pre-formed dicarbonyl compounds with (NH4)(2)CO3 in order to generate the required pyrrole fragment. These ligands readily reacted with the boron reagent BPh3 to afford the complexes [(pyro)BPh2] (2a), [(noro)BPh2] (2b), and [(xaro)BPh2] (2c), where (pyro)H, (noro)H, and (xaro)H represents the 2-pyridyl, 2-quinolinyl, and 2-quinoxalinyl pyrrole groups, respectively. Complexes 2a-2c give stable solutions in air, and show strong photoluminescence with emission peak maxima located at 490 nm, 510 nm, and 575 nm, respectively. Calculations based upon time-dependent density function theory (TDDFT) show that the S-1 state in these complexes is attributed to an allowed (pi-symmetry) -> pi* (pi-symmetry) transition located at the chelating pyrrolide moieties. Electroluminescence (EL) devices based on 2c were fabricated. The EL emission from 2c as the host-emitter, with the emission peak maximum shifted to 580 nm, was observed when BCP was used as the hole blocking material. This device produces saturated red-orange light-emission at an onset voltage of 8 V and a maximum brightness of 5000 cd m(-2) at a driving voltage of 15 V, the external quantum yield is estimated to be 0.5 %.
    Relation Link: http://www.wiley-vch.de/publish/en/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81130
    Appears in Collections:[劉兆玄 (1987-1993)] 期刊論文
    [化學系] 期刊論文

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