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Enhancing NIR-II Upconversion Monochromatic Emission for Temperature Sensing.

Xiaomeng Liu1, Tongtong Liu1, Langping Tu2

  • 1State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 29, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces novel monochromatic upconversion nanoparticles (UCNPs) emitting in the second near-infrared window (NIR-II) for enhanced bioimaging and sensing. These NIR-II UCNPs demonstrate temperature-dependent luminescence, enabling precise temperature sensing applications.

Keywords:
monochromatic emissionnear‐infraredtemperature sensingupconversion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Upconversion luminescence (UCL) in the second near-infrared window (NIR-II) is crucial for advanced applications like high-resolution bioimaging and anticounterfeiting.
  • Conventional upconversion nanoparticles (UCNPs) often emit in the visible spectrum, which can compromise imaging quality.

Purpose of the Study:

  • To develop monochromatic UCNPs emitting in the NIR-II region for improved bioimaging and sensing capabilities.
  • To investigate the effect of Ytterbium (Yb3+) doping on the NIR-II emission properties of Erbium (Er3+)-rich UCNPs.
  • To explore the potential of these NIR-II UCNPs for accurate temperature sensing.

Main Methods:

  • Synthesis of Er3+-rich (NaErF4:x%Yb@NaYF4) nanoparticles.
  • Characterization of upconversion luminescence properties under 1532 nm excitation.
  • Analysis of temperature-dependent luminescence intensity in both visible and NIR-II regions.

Main Results:

  • Successfully fabricated monochromatic UCNPs emitting in the NIR-II region (978 nm).
  • Optimized Yb3+ doping enhances NIR-II emission by improving cross-relaxation and energy transfer.
  • Observed opposite trends in visible and NIR-II luminescence intensities with temperature changes.
  • Developed a formula for temperature determination based on luminescence intensity ratios.

Conclusions:

  • The developed monochromatic NIR-II UCNPs offer superior performance for bioimaging and anticounterfeiting.
  • The temperature-dependent luminescence characteristics enable precise temperature sensing in the NIR-II region.
  • These findings pave the way for novel applications of UCNPs in advanced optical technologies.