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

摘要

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(III) (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 (Phi(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). (C) 2018 Elsevier Ltd. All rights reserved.