50-Fold EQE Improvement up to 6.27% of Solution-Processed All-Inorganic Perovskite CsPbBr<sub>3</sub> QLEDs via Surface Ligand Density Control.

Li, Jianhai; Xu, Leimeng; Wang, Tao; Song, Jizhong; Chen, Jiawei; Xue, Jie; Dong, Yuhui; Cai, Bo et al. · Adv Mater · 2017

basic_science · Level V

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Abstract

Solution-processed CsPbBr<sub>3</sub> quantum-dot light-emitting diodes with a 50-fold external quantum efficiency improvement (up to 6.27%) are achieved through balancing surface passivation and carrier injection via ligand density control (treating with hexane/ethyl acetate mixed solvent), which induces the coexistence of high levels of ink stability, photoluminescence quantum yields, thin-film uniformity, and carrier-injection efficiency.