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    National Tsing Hua University Institutional Repository > 歷任校長 > 劉兆玄 (1987-1993) > 期刊論文 >  Iridium(III) Complexes with Orthometalated Quinoxaline Ligands: Subtle Tuning of Emission to the Saturated Red Color


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81131


    Title: Iridium(III) Complexes with Orthometalated Quinoxaline Ligands: Subtle Tuning of Emission to the Saturated Red Color
    Authors: Hwang, F.-M.;Chen, H.-Y.;Chen, P.-S.;Liu, C.-S.;Chi, Y.;Shu, C.-F.;Wu, F.-I.;Chou, P.-T.;Peng, S.-M.;Lee, G.-H.
    教師: 劉兆玄
    Date: 2005
    Publisher: American Chemical Society
    Relation: INORGANIC CHEMISTRY, American Chemical Society, Volume 44, Issue 5, MAR 7 2005, Pages 1344-1353
    Keywords: LIGHT-EMITTING-DIODES
    EXTERNAL QUANTUM EFFICIENCY
    ORTHO-METALATED COMPLEXES
    ELECTROPHOSPHORESCENT DEVICES
    ORGANIC ELECTROLUMINESCENCE
    OPERATIONAL STABILITY
    IR(III) COMPLEXES
    ELECTRONIC STATES
    TRIPLET EMITTER
    PHOSPHORESCENCE
    Abstract: Rational design and syntheses of four iridium complexes (1-4) bearing two substituted quinoxalines and an additional 5-(2-pyridyl) pyrazolate or triazolate as the third coordinating ligand are reported. Single-crystal X-ray diffraction studies of 1 reveal a distorted octahedral geometry, in which two dpqx ligands adopt an eclipse configuration, for which the quinoxaline N atoms and the C atoms of orthometalated phenyl groups are located at the mutual trans-and cis-positions, respectively. The lowest absorption band for all complexes consists of a mixture of heavy-atom Ir(III)-enhanced (MLCT)-M-3 and (3)pipi(*) transitions, and the phosphorescent peak wavelength can be fine-tuned to cover the spectral range of 622-649 nm with high quantum efficiencies. The cyclic voltarnmetry was measured, showing a reversible, metal-centered oxidation with potentials at 0.76-1.03 V, as well as two reversible reduction waves with potentials ranging from -1.61 to -2.06 V, attributed to the sequential addition of two electrons to the more electron-accepting heterocyclic portion of two distinctive cyclometalated CAN ligands. Complex 1 was used as the representative example to fabricate the red-emitting PLEDs by blending it into a PVK-PBD polymer mixture. The devices exhibited the characteristic emission profile of 1 with peak maxima located at 640 nm. The maximum external quantum efficiency was 3.15% ph/el with a brightness of 1751 cd/M-2 at a current density of 67.4 mA/cm(2) and the maximum brightness of 7750 cd/m(2) was achieved at the applied voltage of 21 V and with CIE coordinates of (0.64, 0.31).
    Relation Link: http://pubs.acs.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81131
    Appears in Collections:[劉兆玄 (1987-1993)] 期刊論文
    [化學系] 期刊論文

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