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Spectral characterization of LiYbF4 upconverting nanoparticles.

Artiom Skripka1, Ting Cheng1, Callum M S Jones2

  • 1Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, Université du Québec, 1650 Boul. Lionel-Boulet, Varennes, Québec J3X 1S2, Canada.

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Researchers explored Yb3+-based upconverting rare-earth nanoparticles (RENPs) for tunable UV to NIR emissions. These core/shell RENPs show promise for applications like optogenetics due to efficient high-order upconversion.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Recent advancements in Yb3+-based upconverting rare-earth nanoparticles (RENPs) necessitate further investigation into their spectral properties.
  • Yb3+-doped RENPs are crucial for applications requiring efficient light conversion and emission tuning.

Purpose of the Study:

  • To systematically explore the spectral features of LiYbF4:RE3+/LiYF4 core/shell RENPs doped with Tm3+, Er3+, or Ho3+.
  • To investigate the tunability of upconversion emissions and the influence of doping concentration and excitation power density.

Main Methods:

  • Synthesis and characterization of LiYbF4:RE3+/LiYF4 core/shell RENPs.
  • Systematic exploration of spectral features including photoluminescence across UV to NIR regions.
  • Analysis of upconversion photon order and average lifetime using steady-state power plots and photoluminescence decay studies.

Main Results:

  • Tm3+-doped RENPs exhibited tunable UV to NIR photoluminescence with dominant high-photon-order upconversion.
  • Er3+- and Ho3+-doped RENPs showed tunable green and red upconversion emissions.
  • Cross-relaxation processes at higher doping concentrations influenced upconversion photon order and lifetime, promoting four- and five-photon emission in Tm3+-RENPs.

Conclusions:

  • LiYbF4:RE3+/LiYF4 RENPs effectively generate high-order upconversion emissions due to efficient Yb3+ excitation energy confinement and funneling.
  • The high quantum yield and potential brightness of these RENPs make them suitable for applications like controlled drug delivery and optogenetics.
  • These RENPs offer a promising platform for advanced photonic applications requiring tunable and efficient upconversion luminescence.