Enabling efficient NIR-II luminescence in lithium-sublattice core–shell nanocrystals towards Stark sublevel based nanothermometry  

作　　者：Songbin Liu Zhengce An Jinshu Huang Bo Zhou 

机构地区：[1]National Rare Earth Functional Material Innovation Center,Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province,College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,Guangzhou 510641,China

出　　处：《Nano Research》2023年第1期1626-1633,共8页纳米研究（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China(Nos.51972119 and 52272151);the Research Project of Education Department of Jiangxi Province(No.GJJ210846);the Doctoral Scientific Research Foundation of Jiangxi University of Science and Technology(No.205200100554).

摘　　要：The luminescence in the second near-infrared(NIR-II)spectral region(1,000–1,700 nm)has recently attracted great attention for emerging biological applications owing to its merit of deep tissue bioimaging and high spatiotemporal resolution.However,it still remains a challenge to achieve the highly efficient NIR-II emissions of lanthanides in nanomaterials.Herein,we report an ideal design of sensitizing lithium sublattice core–shell nanocrystals for efficient NIR-II emission properties from a set of lanthanide emitters including Er3+,Tm3+,Ho3+,Pr3+,and Nd3+.In particular,the typical NIR-II emission of Er3+at 1.5μm was greatly enhanced by further manipulating the energy transfer via Er3+–Ce3+cross-relaxation,and the quantum yield can reach up to 35.74%under 980 nm excitation(12.5 W·cm−2),which is the highest value to the best of our knowledge.The 808 nm responsive efficient NIR-II emission was also enabled at the single-particle level through rational core–shell–shell structure design.Moreover,the lithium-sublattice provides an obvious spectral Stark-splitting feature,which can be used in the ultrasensitive NIR-II nanothermometer with relative sensitivity of 0.248%K−1 and excellent thermal cycling stability.These results open a door to the research of new kinds of efficient NIR-II luminescent materials,showing great promise in various frontier fields such as deep tissue nanothermometry and in vivo bioimaging.

关 键 词：NIR-II LANTHANIDES core-shell nanostructure Stark splitting nanothermometry 

分 类 号：O61[理学—无机化学]