State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM);
Nanjing University of Posts&Telecommunications;
Nanjing;
210023;
P.R.China;
Frontiers Science Center for Flexible Electronics(FSCFE);
MIIT Key Laboratory of Flexible Electronics(KLoFE);
Northwestern Polytechnical University;
Xi’an;
710072;
P.R.China;
Second near-infrared; Rare-earth; Downconversion nanoparticle; Autofluorescence; Fluorescence imaging;