Efficient white polymer light-emitting diodes (WPLEDs) based on covalent-grafting of [Zn-2(MP)(3)(OAc)] into PVK

Abstract

Thanks to the straightforward white light of single grafting-type polymers based on earth-abundant Zn(ii)-complexes, producing cost-effective flexible WOLEDs/WPLEDs with good device performance remains a formidable challenge. Herein, by using the polymer Poly(NVK-co-[Zn-2(MP)(3)(OAc)]) with excellent physical properties for single-layer WPLEDs, record-high efficiencies (eta Maxc = 13.0 cd A(-1), eta Maxp = 6.1 lm W-1 and eta MaxEQE = 9.2%) and low (ca. 25%) efficiency roll-off compared to previous organo-Zn2+-based WOLEDs/WPLEDs are realized. This finding renders single Zn(ii)-complex-grafted polymers a new route to low-cost and large-area flexible WPLEDs for potential full-colour flat displays.