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) ...