Sun Chaoyong, Li Qiuyan, Cao Sheng, Wang Yunjun, Zou Bingsuo, Zhao Jialong
School of Physical Science and Technology, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China.
Suzhou Xingshuo Nanotech Co., Ltd. (Mesolight), Suzhou 215123, China.
J Phys Chem Lett. 2025 Jun 5;16(22):5441-5448. doi: 10.1021/acs.jpclett.5c01186. Epub 2025 May 23.
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) 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 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.
蓝色ZnSeTe量子点发光二极管（QLED）是下一代显示器的有前途的候选者，但其效率和稳定性落后于红色和绿色器件。在此，我们报告了一种协同改性策略，该策略将卤化物离子钝化与无机壳层限制相结合，以提高蓝色ZnSeTe QLED的性能。使用氯离子（Cl）钝化ZnMgO纳米颗粒表面的氧空位缺陷，然后用Mg(OH)无机壳层封装以稳定Cl离子。这种方法显著抑制了非辐射复合和激子猝灭。结果，具有工程化ZnMgO纳米颗粒的蓝色ZnSeTe QLED在6.0 V时表现出17.5%的高外量子效率和13670 cd m的峰值亮度，与未处理的器件相比，工作寿命增加了4.6倍。这项工作为提高蓝色QLED的效率和寿命提供了一条有前途的途径，缩小了全色域的性能差距。
