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Combined In Situ Spectroscopies Reveal the Ligand Ordering-Modulated Photoluminescence of Upconverting Nanoparticles

文献类型： 外文期刊

作者： Xiao, Qingbo 1 ; Xi, Yonglan 1 ; Wang, Jian 2 ; Tu, Datao 5 ; You, Wenwu 5 ; Ye, Xiaomei 1 ; Liu, Hong 7 ; Chen, Xueyuan; 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Circular Agr Res Ctr, East China Sci Observing & Expt Stn Dev & Utiliza, Minist Agr, Nanjing 210014, Peoples R China

2.Chinese Acad Sci, I Lab, Suzhou Inst Nanotech & NanoBion SINANO, Suzhou 215123, Peoples R China

3.Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Suzhou 215123, Peoples R China

4.Univ Sci & Technol China, Sch Nano Technol & Nano Bion, Hefei 230026, Anhui, Peoples R China

5.Chinese Acad Sci, CAS Key Lab Design & Assembly Funct Nanostruct, Fuzhou 350002, Fujian, Peoples R China

6.Chinese Acad Sci, Fujian Key Lab Nanomat, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China

7.South Carta Normal Univ, Sch Chem & Environm, Minist Educ, Key Lab Theoret Chem Environm, Guangzhou 510006, Peoples R China

期刊名称：JOURNAL OF PHYSICAL CHEMISTRY C （ 2020影响因子：4.126； 五年影响因子：4.467 ）

ISSN： 1932-7447

年卷期： 2020 年 124 卷 42 期

页码：

收录情况： SCI

摘要： Clear understanding of the complicated interfacial effect of luminescent nanoparticles is of vital importance for their practical applications. Here, combined in situ spectroscopies based on sum-frequency generation and photoluminescence characterization of lanthanide-doped upconversion nanoparticles are established to distinguish the interfacial quenching effects from ligands and solvents. We provide clear spectroscopic evidence to demonstrate that the ligand conformation significantly influences the extent of luminescence quenching from both the ligands and solvents. Moreover, the ligand disordering induced by an enlarged surface curvature is proved to be one of the major reasons for the notorious size-dependent luminescence quenching of the upconversion nanoparticles. Finally, a conformational entropy-driven strategy is provided to increase the luminescence intensity of the upconversion nanoparticles via capping with mixed layers of oleic and dodecanoic acids. Our findings may open up new avenues for clarifying the complex interfacial photophysical issues regarding inorganic luminescent nanoparticles and promoting their practical applications.

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