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A series of novel praseodymium(Pr)-bonded polymers were successfully synthesized via the coordination reaction and palladium-catalyzed Suzuki coupling reaction of 2,7-dibromo-9,9’-dioctylfluorene and different amounts of 5,5’-dibromo-2,2’-bipyridine. The resulting polymers were characterized by ~1H-NMR and GPC. The photoluminescence(PL) and electroluminescence(EL) properties of the resulting polymers were studied to explore the effects of the Pr triisopropyloxide. The results showed that the incorporation of Pr into the polymers caused better coplanarity and effective intermolecular or intramolecular interaction, leading to the higher emission intensity at long-wavelength. Further, it was also found that the emission light color could be tuned from blue to green by introduction of a small amount of Pr into the polymer main chain. A single-layer green emitting EL device based on PF(Bipy Pr)6 with 6 mol% Pr content was fabricated. The device had a low turn-on voltage of 6 V, a brightness of 705.3 cd·m~(-2), the maximum luminous efficiency of 1.53 cd·A~(-1) and the maximum power efficiency of 0.69 lm·W~(-1).
A series of novel praseodymium (Pr) -bonded polymers were synthesized via the coordination reaction and palladium-catalyzed Suzuki coupling reaction of 2,7-dibromo-9,9’-dioctylfluorene and different amounts of 5,5’-dibromo-2 , The 2’-bipyridine. The resulting polymers were characterized by ~ 1H-NMR and GPC. The photoluminescence (PL) and electroluminescence (EL) properties of the resulting polymers were studied to explore the effects of the Pr triisopropyloxide. The results showed that the incorporation of Pr into the polymers caused better coplanarity and effective intermolecular or intramolecular interaction, leading to the higher emission intensity at long-wavelength. Further, it was also found that the emission light color could be tuned from blue to green by introduction of a small The device had a low turn-on voltage of 6 V, a brightness (brightness) of 6 V, a brightness of 6 V of 705.3 cd · m -2, the maximum luminous efficiency of 1.53 cd · A -1 and the maximum power efficiency of 0.69 lm · W -1.