Zhu Yunke, Lu Xiuyuan, Qiu Jingjing, Bai Peng, Hu An, Yao Yige, Liu Qinyun, Li Yang, Yu Wenjin, Li Yaolong, Jin Wangxiao, Zhu Xitong, Deng Yunzhou, Liu Zhetong, Gao Peng, Zhao XiaoFei, Zhu Youqin, Zhou Li, Jin Yizheng, Gao Yunan
State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China.
Key Laboratory of Excited-State Materials of Zhejiang Province, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310058, China.
Adv Mater. 2025 Feb;37(6):e2414631. doi: 10.1002/adma.202414631. Epub 2024 Dec 9.
The unique anisotropic properties of colloidal quantum wells (CQWs) make them highly promising as components in nanocrystal-based devices. However, the limited performance of green and blue light-emitting diodes (LEDs) based on CQWs has impeded their practical applications. In this study, alloy CdZnSe core CQWs with precise compositions are tailored via direct cation exchange (CE) from CdSe CQWs with specific size, shape, and crystal structure and utilized hot-injection shell (HIS) growth to synthesize CdZnSe/ZnS core/shell CQWs exhibiting exceptional optoelectronic characteristics. This approach enabled the successful fabrication green and blue LEDs manifesting superior performance compared to previously reported solution-processed CQW-LEDs. The devices demonstrated a remarkable peak external quantum efficiency (20.4% for green and 10.6% for blue), accompanied by a maximum brightness 347,683 cd m for green and 38,063 cd m for blue. The high-performance represents a significant advancement for nanocrystal-based light-emitting diodes (Nc-LEDs) incorporating anisotropic nanocrystals. This work provides a comprehensive synthesis strategy for enhancing the efficiency of Nc-LEDs utilizing anisotropic nanocrystals.
胶体量子阱（CQW）独特的各向异性特性使其作为基于纳米晶体的器件组件极具前景。然而，基于CQW的绿色和蓝色发光二极管（LED）性能有限，阻碍了其实际应用。在本研究中，通过从具有特定尺寸、形状和晶体结构的CdSe CQW进行直接阳离子交换（CE）来定制具有精确组成的合金CdZnSe核CQW，并利用热注入壳层（HIS）生长来合成表现出优异光电特性的CdZnSe/ZnS核/壳CQW。这种方法成功制造出了绿色和蓝色LED，与先前报道的溶液法CQW-LED相比，表现出卓越的性能。这些器件展示出显著的峰值外量子效率（绿色为20.4%，蓝色为10.6%），同时绿色LED的最大亮度为347,683 cd/m²，蓝色LED的最大亮度为38,063 cd/m²。这种高性能代表了包含各向异性纳米晶体的基于纳米晶体的发光二极管（Nc-LED）的重大进展。这项工作为提高利用各向异性纳米晶体的Nc-LED效率提供了全面的合成策略。
