Enhancing NIR-II Upconversion Monochromatic Emission for Temperature Sensing

Xiaomeng Liu, Tongtong Liu, Langping Tu, Jing Zuo, Jiaqi Li, Yansong Feng*, Chang jiang Yao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The 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.

Original languageEnglish
Article number2308748
JournalSmall
Volume20
Issue number27
DOIs
Publication statusPublished - 4 Jul 2024

Keywords

  • monochromatic emission
  • near-infrared
  • temperature sensing
  • upconversion

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