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Synthesis, characterization and photophysics of fluorene-alt-oxadiazole copolymers containing pendent iridium (III) complex moiety

Synthesis, characterization and photophysics of fluorene-alt-oxadiazole copolymers containing pendent iridium (III) complex moiety,10.1016/j.eurpolymj

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Synthesis, characterization and photophysics of fluorene-alt-oxadiazole copolymers containing pendent iridium (III) complex moiety  
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A series of fluorene-alt-oxadiazole copolymers containing a pendent phosphor chromophore of the (piq)2Ir(pic) complex were synthesized via the palladium-catalyzed Suzuki coupling reaction, where piq is 1-phenylisoquinoline and pic is picolinic acid. These copolymers exhibited a similar absorption spectrum with a peak at about 330nm and a typical emission peak at 408nm in CH2Cl2 from the fluorene-alt-oxadiazole backbone. However, a significantly red-shifted emission peak at about 625nm was observed in the neat films of these copolymers, which are attributed to the pendent iridium (III) complex unit. Using these copolymers as single emission layer, the polymer light-emitting devices with a configuration of ITO/PEDOT:PSS/copolymers/LiF/Al exhibited a saturated red emission with a peak at 632nm. Significant influence of the attached iridium (III) complex ratio on EL performance was presented. A maximum current efficiency of 1.2cd/A at 63mA/cm2 and a maximum luminance of 1125cd/m2 at 12V were achieved from the device with the copolymer containing iridium (III) complex in a 3% molar ratio.
Journal: European Polymer Journal - EUR POLYM J , vol. 47, no. 9, pp. 1836-1841, 2011
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