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    National Tsing Hua University Institutional Repository > 歷任校長 > 劉兆玄 (1987-1993) > 期刊論文 >  Bright and Efficient, Non-doped, Phosphorescent Organic Red-Light-Emitting Diodes


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81129


    Title: Bright and Efficient, Non-doped, Phosphorescent Organic Red-Light-Emitting Diodes
    Authors: Song, Y.-H.;Yeh, S.-J.;Chen, C.-T.;Chi, Y.;Liu, C.-S.;Yu, J.-K.;Hu, Y.-H.;Chou, P.-T.;Peng, S.-M.;Lee, G.-H.
    教師: 劉兆玄
    Date: 2004
    Publisher: Wiley-VCH Verlag Berlin
    Relation: ADVANCED FUNCTIONAL MATERIALS, Wiley-VCH Verlag Berlin, Volume 14, Issue 12, DEC 2004, Pages 1221-1226
    Keywords: CYCLOMETALATED IRIDIUM COMPLEXES
    IR COMPLEXES
    DEVICES
    ELECTROPHOSPHORESCENCE
    MOLECULES
    Abstract: Ir-(III) metal complexes with formula [(nazo)(2)Ir(Fppz)] (1), [(nazo)(2)Ir(Bppz)] (2), and [(nazo)(2)Ir(Fptz)] (3) [(nazo)H = 4-phenyl quinazoline, (Fppz)H = 3-trifluoromethyl-5-(2-pyridyl) pyrazole, (Bppz)H = 3-t-butyl-5-(2-pyridyl) pyrazole, and (Fptz)H = 3-trifluoromethyl-5-(2-pyridyl) triazole] were synthesized, among which the exact configuration of 1 was confirmed using single-crystal X-ray diffraction analysis. These complexes exhibited bright red phosphorescence with relatively short lifetimes of 0.4-1.05 mus in both solution and the solid-state at room temperature. Non-doped organic light-emitting diodes (OLEDs) were fabricated using complexes 1 and 2 in the absence of a host matrix. Saturated red electroluminescence was observed at lambda(max) = 626 nm (host-emitter complex 1) and 652 nm (host-emitter complex 2), which corresponds to coordinates (0.66,0.34) and (0.69,0.31), respectively, on the 1931 Commission Internationale de L'Eclairage (CIE) chromaticity diagram. The non-doped devices employing complex 1 showed electroluminance as high as 5780 cd m(-2), an external quantum efficiency of 5.5% at 8 V, and a current density of 20 mA cm(-2). The short phosphorescence lifetime of 1 in the solid state, coupled with its modest pi-pi stacking interactions, appear to be the determining factors for its unusual success as a non-doped host-emitter.
    Relation Link: http://www.wiley-vch.de/publish/en/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81129
    Appears in Collections:[劉兆玄 (1987-1993)] 期刊論文
    [化學系] 期刊論文

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