Affiliation:
1. State Key Laboratory of Explosion Science and Technology School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
2. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun Jilin 130033 China
3. Key Laboratory of Automobile Materials (Ministry of Education) College of Materials Science and Engineering Jilin University Changchun 130025 China
Abstract
AbstractThe upconversion luminescence (UCL) in the second near‐infrared window (NIR‐II) is highly attractive due to its excellent performance in high‐resolution bioimaging, anticounterfeiting, and temperature sensing. However, upconvertion nanoparticles (UCNPs) are normally emitted in visible light, potentially impacting the imaging quality. Here, a monochromatic Er3+‐rich (NaErF4:x%Yb@NaYF4) nanoparticles with excitation at 1532 nm and emission at 978 nm is proposed, both situated in the NIR‐II region. The proper proportion of Yb3+ ions doping has a positive effect on the NIR‐II emission, by enhancing the cross relaxation efficiency and accelerating the energy transfer rate. Owing to the interaction between the Er3+ and Yb3+ is inhibited at low temperatures, the UCL emission intensities at visible and NIR‐II regions show opposite trend with temperature changing, which establishes a fitting formula to derive temperature from the luminous intensity ratio, promoting the potential application of UCL in NIR‐II regions for the temperature sensing.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry