Hyperbranched polymers with aggregation-induced emission property for solution-processed white organic light-emitting diodes

Abstract In this work, a new series of hyperbranched polymers of PFTPE-Ir(piq) 3 -X(X = 1, 5, 10) were designed and synthesized, in which tris(1-phenylisoquinoline)iridium(Ш) (Ir(piq) 3 ) acts as red emission core and PFTPE acts as branches. The photophysical study reveals that these hyperbranched polymers exhibit aggregation-induced emission (AIE) characteristic, inducing in much higher photoluminescent quantum yield ( Φ Y ) in neat film than that in dilute tetrahydrofuran (THF) solution. The white-light OLEDs using PFTPE-Ir(piq) 3 -X as emission layer show rather weaker efficiency roll-off. Especially, the white-light OLED based on PFTPE-Ir(piq) 3 -5 as emission layer shows a maximum luminance of 4686 cd/m 2 , a maximum luminous efficiency of 2.43 cd/A, a maximum external quantum efficiency of 1.08% and the Commission Internationale de l’Eclairage coordinate of (0.26, 0.36).