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Sandwich Nanoparticles Mediated by Ytterbium Sublattice for Advanced Photonic Applications
Longchi Li1, Chunwen Yuan1, Yujie Chen1
1College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China.
ACS Applied Materials & Interfaces
|July 24, 2025
Summary
This study introduces novel sandwich-structured upconversion nanoparticles (UCNPs) for enhanced noncontact temperature sensing. The new design offers high sensitivity and a broad detection range, improving upon conventional methods.
Area of Science:
- Materials Science
- Nanotechnology
- Photonics
Background:
- Upconversion nanoparticles (UCNPs) are valuable for temperature sensing and optical applications.
- Conventional UCNP thermometers using thermally coupled energy levels lack sensitivity and have a limited temperature range.
Purpose of the Study:
- To develop a novel nanoparticle system for high-precision, noncontact temperature sensing.
- To overcome the limitations of conventional thermometers based on thermally coupled energy levels.
Main Methods:
- Fabrication of a sandwich-structured nanoparticle system: NaYF4:10%Gd@NaYF4:20%Yb, 2%Ho@NaYbF4.
- Utilizing emissions from nonthermally coupled energy levels for temperature detection.
- Characterization of optical properties and temperature sensing performance.
Main Results:
- The proposed NaYF4:10%Gd@NaYF4:20%Yb, 2%Ho@NaYbF4 system exhibits high relative sensitivity up to 10.3% K-1.
- Effective temperature sensing was achieved over a wide temperature range (100-400 K).
- The system demonstrates potential for noncontact temperature sensing and optical information encryption.
Conclusions:
- The novel sandwich-structured UCNPs offer superior temperature sensing capabilities compared to conventional methods.
- This advancement holds significant promise for advanced photonic applications, including high-precision thermal measurements and secure information encoding.
