Synthesis, characterization and photophysics of fluorene-alt-oxadiazole copolymers containing pendent iridium (III) complex moiety |
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| Authors: | Jiyong Deng Yu Liu Yafei Wang Hua Tan Zhiyong Zhang Gangtie Lei Junting Yu Meixiang Zhu Weiguo Zhu Yong Cao |
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| Institution: | aCollege of Chemistry, Key Lab of Environment-Friendly Chemistry and Application of the Ministry of Education, Xiangtan University, Xiangtan 411105, China;bDepartment of Chemistry and Engineering, Hunan Institute of Engineering, Xiangtan 411104, China;cInstitute of Polymer Optoelectronic Material and Devices, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | 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 330 nm and a typical emission peak at 408 nm in CH2Cl2 from the fluorene-alt-oxadiazole backbone. However, a significantly red-shifted emission peak at about 625 nm 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 632 nm. Significant influence of the attached iridium (III) complex ratio on EL performance was presented. A maximum current efficiency of 1.2 cd/A at 63 mA/cm2 and a maximum luminance of 1125 cd/m2 at 12 V were achieved from the device with the copolymer containing iridium (III) complex in a 3% molar ratio. |
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| Keywords: | Electroluminescence Polyfluorene Copolymers Oxadiazole Iridium (III) complex |
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