Synergistic Chloride Passivation and Inorganic Shell Confinement in ZnMgO Nanoparticles for Efficient and Stable Blue ZnSeTe QLEDs
Chaoyong Sun, Qiuyan Li, Sheng Cao, Yunjun Wang, Bingsuo Zou, Jialong Zhao
Abstract
Blue ZnSeTe quantum dot light-emitting diodes (QLEDs) are promising candidates for next-generation displays, but their efficiency and stability lag behind those of red and green devices. Herein, we report a synergistic modification strategy that integrates halide ion passivation with inorganic shell confinement to boost the performance of blue ZnSeTe QLEDs. Chlorine ions (Cl – ) were employed to passivate oxygen vacancy defects on the surface of ZnMgO nanoparticles, followed by encapsulation with a Mg(OH) 2 inorganic shell to stabilize Cl – ions. This approach significantly suppresses nonradiative recombination and exciton quenching. As a result, the blue ZnSeTe QLEDs with the engineered ZnMgO nanoparticles exhibit a high external quantum efficiency of 17.5% and a peak luminance of 13670 cd m –2 at 6.0 V, alongside a 4.6-fold increase in operational lifetime compared to the untreated ones. This work provides a promising pathway to enhance the efficiency and longevity of blue QLEDs, narrowing the performance gap across the full color spectrum.