发光学报2026，Vol.47Issue(2)：258-266,9.DOI:10.37188/CJL.20250240
柠檬酸配体改善绿光钙钛矿发光二极管发光效率
Citric Acid Ligands for Enhancing Efficiency of Green Perovskite Light-emitting Diodes
摘要
Abstract
Metal halide perovskite nanocrystals(CsPbX3)have emerged as promising candidate materials for dis-play technologies due to their excellent optoelectronic properties.However,the weak coordination and long-chain structure of conventional ligands,such as oleic acid and oleylamine(OA/OLA),result in surface defects and hin-dered carrier transport,which significantly limit the performance enhancement of perovskite light-emitting diodes(PeLEDs).In this study,a short-chain,strongly chelating citric acid(CA)ligand was introduced.This ligand forms both coordination bonds and hydrogen bonds with the CsPbBr3 surface through its carboxyl(—COOH)and hydroxyl(—OH)functional groups,effectively passivating surface defects of the nanocrystals.Experimental results combined with density functional theory(DFT)calculations demonstrate that the adsorption energy of citric acid ligands is considerably higher than that of traditional OA/OLA ligands.This leads to a more uniform nanocrystal size distribution,significantly enhanced photoluminescence quantum yield(PLQY),and a substantial reduction in the non-radiative recombination rate.Green-emitting PeLEDs based on citric acid-modified CsPbBr3 nanocrystals exhibit excellent electroluminescent performance,achieving a peak external quantum efficiency(EQE)of 13.58％and a peak current efficiency of 42.93 cd/A.This study presents a novel strategy for surface defect engineering of perovskites through cost-effective ligand design,and the multidentate chelating mechanism may be applicable to oth-er optoelectronic devices such as photodetectors and solar cells.关键词
钙钛矿/发光二极管/配体/外量子效率Key words
perovskite/light-emitting diode/ligands/external quantum efficiency分类
数理科学引用本文复制引用
白雯昊,任冠华,宋坤洁,迪达尔·叶尔扎提,周嘉婧,宣曈曈,解荣军..柠檬酸配体改善绿光钙钛矿发光二极管发光效率[J].发光学报,2026,47(2):258-266,9.基金项目
国家自然科学基金(523B2016,12374385) （523B2016,12374385）
广东省基础与应用基础研究基金(2023A1515030004) （2023A1515030004）
深圳市科技计划(JCYJ20230807091404009) （JCYJ20230807091404009）
中央高校基本科研业务费专项资金(20720250116) （20720250116）
福建省优秀博士后支持专项Supported by National Natural Science Foundation of China(523B2016,12374385) （523B2016,12374385）
Guangdong Basic and Applied Basic Research Foundation(2023A1515030004) （2023A1515030004）
Shenzhen Science and Technology Program(JCYJ20230807091404009) （JCYJ20230807091404009）
the Fun-damental Research Funds for the Central Universities(20720250116) （20720250116）
Fujian Province Excellent Postdoctoral Support Special Program （）
