Rare-earth Doped Nanoparticles with Narrow NIR-II Emission for Optical Imaging with Reduced Autofluorescence  

作　　者：LU Feng ZHAO Ting SUN Xiaojun WANG Zuqiang FAN Quli HUANG Wei 

机构地区：[1]State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing,210023,P.R.China [2]Frontiers Science Center for Flexible Electronics(FSCFE),MIIT Key Laboratory of Flexible Electronics(KLoFE),Northwestern Polytechnical University,Xi’an,710072,P.R.China

出　　处：《Chemical Research in Chinese Universities》2021年第4期943-950,共8页高等学校化学研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.21975131,21674048);the Fund of Synergetic Innovation Center for Organic Electronics and Information Displays;the Primary Research&Development Plan of Jiangsu Province,China(No.BE2016770).

摘　　要：Fluorescence imaging in the second near-infrared region(900―1700 nm, NIR-II) with a high resolution and penetration depth due to the significantly reduced tissue scattering and autofluorescence has emerged as a useful tool in biomedical fields. Recently, many efforts have been devoted to the development of fluorophores with an emission band covering the long-wavelength end of NIR-II region(1500―1700 nm) to eliminate the autofluorescence. Alternatively, we believe imaging with a narrow bandwidth could also reduce the autofluorescence. As a proof of concept, NaYF4:Yb,Nd@NaYF4 downconversion nanoparticles(DCNPs) with sharp NIR-II emission were synthesized. The luminescence of DCNPs showed a half-peak width of 49 nm centered at 998 nm, which was perfectly matched with a (1000±25) nm bandpass filter. With this filter, we were able to retain most of the emissions from the nanoparticles, while the autofluorescence was largely reduced. After PEGylation, the DCNPs exhibited great performance for blood vessel and tumor imaging in living mice with significantly reduced autofluorescence and interference signals. This work provided an alternative way for the low-autofluorescence imaging and emphasized the importance of narrow emitting rare-earth doped nanoparticles for NIR-II imaging.

关 键 词：Second near-infrared RARE-EARTH Downconversion nanoparticle AUTOFLUORESCENCE Fluorescence imaging 

分 类 号：O657.3[理学—分析化学]