Ligand Engineering Achieves Suppression of Temperature Quenching in Pure Green Perovskite Nanocrystals for Efficient and Thermostable Electroluminescence  

作　　者：Kaiwang Chen Qing Du Qiufen Cao Chao Du Shangwei Feng Yutong Pan Yue Liang Lei Wang Jiangshan Chen Dongge Ma 

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,Guangdong Basic Research Center of Excellence for Energy&Information Polymer Materials,State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Luminescence From Molecular Aggregates,South China University of Technology,Guangzhou 510640,People’s Republic of China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第4期25-38,共14页纳微快报(英文版)

基　　金：support from the National Key Research and Development Program of China(2022YFE0206000);the National Natural Science Foundation of China(U2001219,51973064);the Guangdong Basic and Applied Basic Research Foundation(2023B1515040003,2024A1515010262);the Natural Science Foundation of Guangdong Province(2023B1212060003);the Open Project Program of Wuhan National Laboratory for Optoelectronics(NO.2021WNLOKF014);the State Key Lab of Luminescent Materials and Devices,South China University of Technology(Skllmd-2023-05).

摘　　要：Formamidinium lead bromide(FAPbBr_(3))perovskite nanocrystals(NCs)are promising for display and lighting due to their ultra-pure green emission.However,the thermal quenching will exacerbate their performance degradation in practical applications,which is a common issue for halide perovskites.Here,we reported the heat-resistant FAPbBr_(3)NCs prepared by a ligand-engineered room-temperature synthesis strategy.An aromatic amine,specificallyβ-phenylethylamine(PEA)or 3-fluorophenylethylamine(3-F-PEA),was incoporated as the short-chain ligand to expedite the crystallization rate and control the size distribution of FAPbBr_(3)NCs.Employing this ligand engineering approach,we synthesized high quality FAPbBr_(3)NCs with uniform grain size and reduced long-chain alkyl ligands,resulting in substantially suppressed thermal quenching and enhanced carrier transportation in the perovskite NCs films.Most notably,more than 90%of the room temperature PL intensity in the 3-F-PEA modified FAPbBr_(3)NCs film was preserved at 380 K.Consequently,we fabricated ultra-pure green EL devices with a room temperature external quantum efficiency(EQE)as high as 21.9%at the luminance of above 1,000 cd m^(-2),and demonstrated less than 10%loss in EQE at 343 K.This study introduces a novel room temperature method to synthesize efficient FAPbBr_(3)NCs with exceptional thermal stability,paving the way for advanced optoelectronic device applications.

关 键 词：Perovskite nanocrystals Ligands engineering Thermal quenching Ultra-pure green emission Light-emitting diodes 

分 类 号：TB383.1[一般工业技术—材料科学与工程]