Bromide Decorated Eco‐Friendly ZnSeTe/ZnSe/ZnS Quantum Dots for Efficient Blue Light‐Emitting Diodes

Abstract Multi‐shelled ZnSeTe/ZnSe/ZnS quantum dots (QDs) have served as a promising eco‐friendly emitter for blue dot light‐emitting diodes (QLEDs). While extensive studies concentrated on the optimization of shell species and thickness multi‐shelled QDs to raise QLED electroluminescent performance, very few reports focus QD surface states involving ligand defect modulations which are essential high‐performance QLEDs. Herein, strategy bromide decoration is theoretically practically demonstrated simultaneously diminish defects by passivating unsaturated Zn strengthened carrier radiative recombination removing superabundant oleic acid through exchange efficient transport. As result, merits benefit large increase in photoluminescence yield (PLQY) from 39.7% 86.2% at wavelength 443 nm, well great enhancement device performance with over sevenfold improvement external efficiency (EQE) 0.74% 5.46% distinct decrease turn‐on voltage 6.7 5.9 V. Consequently, this work contributes an effective approach toward enhanced performance.