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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chen, CHSubject: search.filters.subject.fluorescence

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    Polyquinolines containing both spirobifluorene and cardofluorene units: Synthesis and characterization
    (2004-07-01)
    Chen, CH
    ;
    Shu, CF
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    We have synthesized aromatic polyquinolines containing both spirobifluorene and cardofluorene moieties in the main chain by applying acid-catalyzed Friedlander quinoline synthesis. The incorporation of these rigid nonplanar structures into the polymer backbone, which restricts segmental mobility, significantly increases both the glass-transition temperature and thermal stability, while providing enhanced solubility as a result of a decrease in the degree of molecular packing and crystallinity. We have also examined the optical and electrochemical properties of these polyquinolines. The low-lying lowest unoccupied molecular orbital energy level and quasireversible electrochemical reduction of these polyquinolines suggest their potential for use as electron-injecting/transporting materials in polymer light-emitting diodes. (C) 2004 Wiley Periodicals, Inc.
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    A new yellow fluorescent dopant for high-efficiency organic light-emitting devices
    (2006-02-21)
    Wu, YS
    ;
    Liu, TH
    ;
    Chen, HH
    ;
    Chen, CH
    ;
    應用化學系
    We describe the design and synthesis of a sterically hindered yellow dopant, tetra(l-butyl)rubrene (TBRb) which, when doped in either 1,4-bis[N-(1-naphthyl)-N'-phenylamino]-biphenyl or aluminum tris(8-hydroxyquinoline) (Alq(3)) as emitter, shows nearly 25% increase in luminance efficiency over that of the state-of-the-art rubrene (Rb) device without significantly effecting its corresponding color. At 5% doping in Alq3 and 20 mA/cm(2) current drive condition, the electroluminescence efficiency of TBRb reaches 8.5 cd/A and 2.8 1m/W with a yellow color of Commission Internationale de l'Eclairage chromaticity coordinates (CIEx,y)=[0.52,0.48], which is among the best ever reported for yellow electrofluorescence in organic light-emitting devices. (c) 2005 Elsevier B.V. All rights reserved.