Chiral Helical Polymer‐Induced Efficient Circularly Polarized Organic Light‐Emitting Diodes

Abstract

AbstractCircularly polarized organic light‐emitting diodes (CP‐OLEDs) have attracted tremendous attention, but constructing CP‐OLEDs with both high electroluminescence dissymmetry factors (gEL) and good device performance remains a big challenge. The present work reports the first CP‐OLEDs by using chiral helical polymers as inducers to trigger efficient CP electroluminescence from achiral conjugated polymers. The successful preparation of CP‐OLEDs based on two chiral helical polymers further demonstrates the universality of the established strategy. Benefiting from the high helical twisting power of the chiral helical polymer, a maximum |gEL| value of 2.0 × 10−2 is obtained in the resulting CP‐OLEDs. Moreover, by adopting an inverted device structure, the device performance of the CP‐OLEDs is significantly improved, with a maximum brightness of 49340/51973 cd m−2, high current efficiency of 5.62/5.44 cd A−1, and low turn‐on voltage of 3.1/3.1 V, respectively. The work offers new insights into fabricating CP‐OLEDs by taking advantage of chiral helical polymers.