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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Mass-Manufactural Lanthanide-Based Ultraviolet B Microlasers.

Limin Jin1, Yunkai Wu1, Yujie Wang1

  • 1State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|December 28, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed mass-producible ultraviolet B (UVB) microlasers using lanthanide-based nanocrystals. This innovation overcomes limitations in optical gain and device repeatability for UVB laser applications in diagnostics and phototherapy.

Keywords:
high controllabilitylanthanide-doped upconversion nanocrystalson-chip microlaser arraysultraviolet B lasing emissionwhispering gallery modes

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Lanthanide (Ln3+)-based ultraviolet B (UVB) microlasers are crucial for diagnostics and phototherapy.
  • Current UVB microlasers face challenges with low optical gain, poor light confinement, and device repeatability.

Purpose of the Study:

  • To develop mass-producible UVB microlasers.
  • To overcome limitations of existing UVB microlaser technology.

Main Methods:

  • Fabrication of LiYbF4:Tm@LiYbF4@LiLuF4 core-shell-shell nanocrystals for enhanced absorption.
  • Spin-coating nanocrystal solution onto patterned SiO2 substrates for self-assembled microdisk formation.
  • Realization of UVB whispering-gallery-mode lasers.

Main Results:

  • Achieved a significant improvement in gain coefficient at 289 nm.
  • Demonstrated UVB lasers with a lasing threshold an order of magnitude lower than deep-ultraviolet emission at 310.5 nm.
  • Confirmed highly controllable and repeatable lasing wavelengths and mode numbers.

Conclusions:

  • The novel approach enables mass production of high-quality Ln3+-based UVB microlasers.
  • The developed UVB microlasers offer enhanced performance and reliability.
  • This breakthrough paves the way for widespread application of UVB microlasers in diagnostics and phototherapy.