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• W2072296987 abstract "Two new vinylene alternating copolymers F and C that contained 2,4,6-triphenylpyridine as a common moiety and fluorene or carbazole, respectively, as an alternating moiety were prepared by Heck coupling. They showed an outstanding thermal stability being stable up to approximately 350 C and had relatively high glass transition temperatures (140 and 111 C). The existence of the 2,4,6-triphenylpyridine kinked units along the polymer backbone caused a partial interruption of the p-conjugation. The copolymers emitted bluegreen light with emission maximum at 446–464 nm and quantum yields of 0.52 and 0.28 in THF solution. The electrochemical properties of copolymers F and C, including HOMO and LUMO levels, were estimated from their cyclic voltammograms. Their electroluminescence (EL) emission maxima (greater than 500 nm) showed significant red-shifts relative to the PL maxima, which has been explained by the direct cross recombination transition between electrons and holes trapped on carbazole or triphenylpyridine subunits. Moreover, the emission colors transform gradually with increasing bias and approach to white color at about 30 � 35 V. The maximal luminance (maximal luminance efficiency) of the EL devices (ITO/PEDOT:PSS/F or C/Ca/Al) were 647 cd/m 2 (0.13 cd/A) or 615 cd/m 2" @default.
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• W2072296987 date "2009-01-01" @default.
• W2072296987 modified "2023-09-26" @default.
• W2072296987 title "Synthesis, photophysics and electroluminescence of new vinylene-copolymers with 2,4,6-triphenylpyridine kinked segments along the main chain" @default.
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• W2072296987 doi "https://doi.org/10.1016/j.eurpolymj.2008.10.015" @default.
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