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Manipulating upconversion luminescence intensity in a single crystal particle with a waveguide structure.

Qingyan Han1, Bochao Zhao1, Wei Gao1

  • 1School of Electronic Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China. qyhan@xupt.edu.cn.

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Summary

Lanthanide-doped upconversion luminescence (UCL) materials were enhanced using β-NaYF₄ microtubes acting as optical waveguides. This design improves light confinement and interaction, boosting UCL efficiency for potential applications.

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Area of Science:

  • Materials Science
  • Photonics
  • Nanotechnology

Background:

  • Lanthanide (Ln)-doped upconversion luminescence (UCL) materials exhibit unique photophysical properties.
  • Improving UCL efficiency remains a key scientific challenge.
  • Optical waveguides can enhance light-matter interactions.

Purpose of the Study:

  • To design and fabricate β-NaYF₄ microtubes (MTs) with an optical waveguide structure.
  • To investigate the UCL properties of single Ln-doped β-NaYF₄ MTs using waveguide-excitation modes.
  • To enhance UCL efficiency through optimized light coupling and confinement.

Main Methods:

  • Fabrication of hexagonal β-NaYF₄ microtubes with wedge-shaped ends.
  • Systematic investigation of UCL properties using waveguide-excitation modes.
  • Modulating excitation light coupling by adjusting the angle between the MT end plane and microscope slide.
  • Confining and propagating excitation light (633 nm laser) within the MT structure.

Main Results:

  • β-NaYF₄ MTs exhibit a natural optical waveguide structure.
  • Efficient coupling of excitation light into the MTs was achieved by angle modulation.
  • Excitation light propagation within the MTs was observed due to the waveguide effect.
  • Enhanced light-to-MT interactions leading to improved UCL efficiency.

Conclusions:

  • The designed β-NaYF₄ MTs function as effective optical waveguides for enhancing UCL.
  • This approach offers a powerful solution for developing high-efficiency Ln-doped UCL materials.
  • Potential applications in optical communication and biomedical fields are suggested.