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上海大学 新型显示技术及应用集成教育部重点实验室, 上海 200072
王源坤,男,博士研究生,2024年于新疆大学获得硕士学位,主要从事量子点发光二极管制备及性能的研究。E-mail:ykwang@shu.edu.cn
张东康,男,硕士研究生,2024年于山东交通学院获得学士学位,主要从事量子点材料制备及性能的研究。E-mail:853223639@shu.edu.cn
杨绪勇,男,博士,教授,2014年于新加坡南洋理工大学获得博士学位,主要从事光电材料与器件的研究。E-mail:yangxy@shu.edu.cn
王胜,男,博士,讲师,2017年于吉林大学获得博士学位,主要从事半导体材料合成及器件性能的研究。E-mail:nanocrystal@shu.edu.cn
收稿:2025-11-07,
修回:2025-12-23,
纸质出版:2026-01-05
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王源坤, 张东康, 夏梦洋, 等. 多功能配体修饰实现高性能蓝光量子点发光二极管[J]. 液晶与显示, 2026,41(1):65-73.
WANG Yuankun, ZHANG Dongkang, XIA Mengyang, et al. High-performance blue quantum dot light-emitting diodes enabled by multifunctional ligand modification[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(1): 65-73.
王源坤, 张东康, 夏梦洋, 等. 多功能配体修饰实现高性能蓝光量子点发光二极管[J]. 液晶与显示, 2026,41(1):65-73. DOI: 10.37188/CJLCD.2025-0225. CSTR: 32172.14.CJLCD.2025-0225.
WANG Yuankun, ZHANG Dongkang, XIA Mengyang, et al. High-performance blue quantum dot light-emitting diodes enabled by multifunctional ligand modification[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(1): 65-73. DOI: 10.37188/CJLCD.2025-0225. CSTR: 32172.14.CJLCD.2025-0225.
量子点发光二极管(QLED)因其优异的光电特性,被视为下一代显示与照明技术的有力候选者。然而蓝光QLED在性能上仍显著落后于绿光和红光器件,严重制约了QLED全彩显示技术的商业化进程。一方面,蓝光量子点较深的价带能级使其与空穴传输层之间存在较高的空穴注入势垒,且表面长链油酸配体不利于载流子传输。另一方面,蓝光量子点核、壳材料的能级差较小,导致载流子容易与表面缺陷态发生耦合,引起非辐射复合,降低器件效率。本研究采用多功能配体盐酸苄基羟胺(BHACl)修饰蓝光量子点的表面。BHACl取代原有的长链油酸配体,提升了量子点薄膜中的载流子传输性能;其分子中的NH
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1.60866666
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基团能够钝化表面硫悬空键,抑制非辐射复合;BHACl具有的大偶极矩使量子点能级整体上移,提高了空穴注入效率。基于此,制备的蓝光QLED器件实现了外量子效率(EQE)为19.2%,峰值亮度为28 237 cd·m
-2
,在100 cd·m
-2
初始亮度下器件寿命为8 986 h,各项性能显著优于对照器件。
Quantum dot(QD) light-emitting diodes (QLEDs) are regarded as promising candidates for next-generation display and lighting technologies due to their excellent optoelectronic properties. However, the performance of blue QLEDs still lags far behind green and red counterparts, which seriously hinders the commercialization of QLED full-color displays. The main challenges arise from the deep valence band energy level of blue QDs, which leads to a large hole injection barrier at the QD/hole-transport layer (HTL) interface, as well as the insulating nature of long-chain oleic acid ligands that hinder charge transport. Moreover, the small energy offset between the core and shell materials in blue QDs facilitates carrier trapping at surface defect states, resulting in non-radiative recombination and thus reducing device efficiency. In this work, we introduce a multifunctional ligand, benzylhydroxylamine hydrochloride (BHACl), to modify the surface of blue QDs. The BHACl molecules replace the native long-chain oleic acid ligands, significantly improving the carrier transport within QD films. Meanwhile, the NH
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groups effectively passivate surface sulfur dangling bonds, suppressing non-radiative recombination. In addition, the large dipole moment of BHACl upshifts the QD energy levels, thereby reducing the hole injection barrier. Benefiting from these synergistic effects, the fabricated blue QLEDs exhibit an external quantum efficiency (EQE) of 19.2%, a peak luminance of 8 986 cd·m
-2
, and an operational lifetime of 18 170 h at an initial luminance of 100 cd·m
-2
, representing substantial improvements over the control devices.
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