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A series of benzotriazole (BTz)‐ and dithienopyrrole (DTP)‐based three polymers; poly[2‐(2‐dodecyl‐2H‐benzo[d][1,2,3]triazol‐4‐yl)‐4‐hexyl‐4H‐dithieno[3,2‐b:2′,3′‐d]pyrrole] (P1), poly[2‐ (5‐(2‐dodecyl‐7‐(thiophen‐2‐yl)‐2H‐benzo[d][1,2,3]triazol‐4‐yl)thiophen‐2‐yl)‐4‐hexyl‐4H‐dithieno[3,2‐b:2′,3′‐d]pyrrole] (P2), and poly[2‐(5‐(2‐dodecyl‐7‐(4‐hexylthiophen‐2‐yl)‐2H‐benzo[d][1,2,3]triazol‐4‐yl)‐3‐hexylthiophen‐2‐yl)‐4‐hexyl‐4H‐dithieno[3,2‐b:2′,3′‐d]pyrrole] (P3) was synthesized via Stille coupling. To investigate the effect of the π‐bridges on the electrochromic properties of BTz‐based polymers, thiophene and 3‐ hexylthiophene was incorporated between BTz and DTP moiety. Different π‐bridges affected the HOMO and LUMO energy levels, coloration efficiency, switching time, and optical contrast.

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Light emitting properties of poly[4-(5-(biphenyl-4-yl)-4-hexylthiophen-2-yl)-2-dodecyl-7-(4-hexyl-thiophen-2-yl)-2H-benzo[d][1,2,3]-triazole] (PPhHTBT) and poly(9-vinylcarbazole) (PVK) blends were investigated with a configuration of ITO/PEDOT-PSS/BLEND/Ca/Al in ratios ranging from 5 to 100 wt% in PPhHTBT. Thin film and solution spectra of all blends revealed that energy transfer was completely achieved. Device performance increased for all blends and reached 1.1 cd/A for 30 wt% PPhHTBT.