Novel Supramolecular Polymers Based on Zinc-Salen Chromophores for Efficient Light-Emitting Diodes

A novel series of supramolecular polymers based on zinc‐salen chromophores were readily prepared via ligand‐metal coordination. These polymers were characterized by FT‐IR, NMR, GPC and elemental analysis. All the polymers were readily soluble in common organic solvents and had substantially good thermal properties. Cyclic voltammetry revealed they had LUMO energy levels ranging from −3.20 to −3.23 eV and HOMO energy levels ranging from −6.13 to −6.15 eV. The polymer films can emit strong green photoluminescence (PL) with relatively high quantum efficiencies of 42–51%. Light‐emitting diodes with the configuration ITO/PEDOT/polymer/BCP/Alq3/LiF/Al were efficient green emitters, with maximum current efficiencies of 0.9–2.3 cd · A−1. The preliminary EL results thus suggest that these polymers are potential candidates for efficient green emission in polymer LEDs. Structures of polymers produced.