A novel, bipolar polymeric host based on a poly(aryl ether) containing phosphine oxide units in the electron-transporting main chain and carbazole units in the hole-transporting side chains is designed and synthesized for blue electrophosphorescence. This polymeric host possesses a bipolar character and a high ET of 2.96 eV. The efficiency of blue-emitting PhPLEDs based on this polymeric host doped with FIrpic reaches 23.3 cd A−1 (EQE = 10.8%).
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