Abstract
A new thermally robust electroluminescent (EL) carbazole-based π-conjugated copolymer, including poly[3,7-(N-hexylcarbazole)-co-4,7-{5,6-bis(3,7-dimethyloctylo- xymethyl)-2,1,3-(benzothiadiazole)}] (PCz- co -P2C10BT) was synthesized and used to fabricate the efficient polymer light-emitting diodes (PLEDs). The glass transition temperature of the PCz- co -P2C10BT (105°C) was found to be higher than that of poly(9,9-dialkylfluorene) derivatives. We fabricated PLEDs in ITO/PEDOT/light-emitting polymer/Alq3/LiF/Al configuration. The new copolymer was found to have green emission color (523 nm). The maximum brightness and external quantum efficiency of PCz- co -P2C10BT were 260 cd/m2 at 14 V and 0.22%, respectively.
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