多功能配体修饰实现高性能蓝光量子点发光二极管
High-performance blue quantum dot light-emitting diodes enabled by multifunctional ligand modification
摘要
Abstract
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+3 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.关键词
量子点发光二极管/多功能配体/载流子传输/外量子效率Key words
quantum dot light-emitting diodes/multifunctional ligand/carrier transport/external quantum efficiency分类
数理科学引用本文复制引用
王源坤,张东康,夏梦洋,钟秉霖,吴倩倩,王林,杨绪勇,王胜..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):65-73,9.基金项目
国家重点研发计划(No.2024YFB3612404) （No.2024YFB3612404）
国家自然科学基金(No.T2525035,No.62174104,No.12404479,No.62204214) （No.T2525035,No.62174104,No.12404479,No.62204214）
上海市学术/技术科研带头人计划(No.22XD1421200) （No.22XD1421200）
上海市自然科学基金(No.23ZR1423300) （No.23ZR1423300）
上海市科学技术委员会项目(No.22YF1413500) （No.22YF1413500）
河南省自然科学基金(No.242300420681) （No.242300420681）
中国博士后科学基金(No.GZC20240971,No.GZB20240416) Supported by National Key Research and Development Program of China(No.2024YFB3612404) （No.GZC20240971,No.GZB20240416）
National Natural Science Foundation of China(No.T2525035,No.62174104,No.12404479,No.62204214) （No.T2525035,No.62174104,No.12404479,No.62204214）
Program of Shanghai Academic/Technology Research Leader(No.22XD1421200) （No.22XD1421200）
Natural Science Foundation of Shanghai(No.23ZR1423300) （No.23ZR1423300）
Program of Shanghai Science and Technology Committee(No.22 YF1413500) （No.22 YF1413500）
Henan Provincial Natural Science Foundation(No.242300420681) （No.242300420681）
China Postdoctoral Science Foundation(No.GZC20240971,No.GZB20240416) （No.GZC20240971,No.GZB20240416）
