Yunke Zhu, Xiuyuan Lu, Jingjing Qiu, Peng Bai, An Hu, Yige Yao, Qinyun Liu, Yang Li, Wenjin Yu, Yaolong Li, Wangxiao Jin, Xitong Zhu, Yunzhou Deng, Zhetong Liu, Peng Gao, XiaoFei Zhao, Youqin Zhu, Li Zhou, Yizheng Jin, Yunan Gao
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引用次数: 0
摘要
胶体量子阱（CQWs）独特的各向异性特性使其在纳米晶基器件中具有很高的应用前景。然而，基于CQWs的绿色和蓝色发光二极管（led）的有限性能阻碍了它们的实际应用。在本研究中，通过直接阳离子交换（CE）从具有特定尺寸、形状和晶体结构的CdSe CQWs中定制具有精确成分的合金CdZnSe核心CQWs，并利用热注入壳（HIS）生长合成具有优异光电特性的CdZnSe/ZnS核心/壳CQWs。与先前报道的溶液处理cqw led相比，这种方法使成功制造的绿色和蓝色led表现出优越的性能。器件表现出显著的峰值外量子效率（绿色为20.4%，蓝色为10.6%），伴随着绿色和蓝色的最大亮度分别为347,683 cd m−2和38,063 cd m−2。这种高性能代表了采用各向异性纳米晶体的纳米晶体基发光二极管（nc - led）的重大进步。本研究为利用各向异性纳米晶体提高nc - led的效率提供了一种综合的合成策略。
High-Performance Green and Blue Light-Emitting Diodes Enabled by CdZnSe/ZnS Core/Shell Colloidal Quantum Wells
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−2 for green and 38,063 cd m−2 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.
期刊介绍：
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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