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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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Size dependent ultraviolet upconversion in single YF3:Yb3+/Tm3+ particles.

Zhenyu Liu1, Kezhi Zheng, Dan Zhao

  • 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science & Engineering, Jilin University, Changchun 130012, P. R. China.

Journal of Nanoscience and Nanotechnology
|March 15, 2012
PubMed
Summary
This summary is machine-generated.

Researchers synthesized Ytterbium (Yb3+)-Thulium (Tm3+) codoped YF3 microparticles. Smaller particle sizes significantly enhanced near-infrared to ultraviolet optical upconversion (UC) intensity, revealing a size-dependent effect.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Optical upconversion (UC) materials enable the conversion of lower-energy photons to higher-energy photons.
  • Yttrium fluoride (YF3) doped with rare-earth ions like Ytterbium (Yb3+) and Thulium (Tm3+) are promising UC materials.
  • Understanding size-dependent phenomena is crucial for optimizing UC efficiency.

Purpose of the Study:

  • To synthesize Yb3+-Tm3+ codoped YF3 bulk material and microparticles.
  • To investigate the effect of particle size on near-infrared (NIR) to ultraviolet (UV) optical upconversion.
  • To elucidate the mechanisms behind the observed small size effect (SSE).

Main Methods:

  • High-temperature calcination method for material synthesis.
  • Grinding and selection techniques to obtain microparticles of varying sizes.
  • Optical spectroscopy under 980 nm excitation to measure UC emission.

Main Results:

  • Micro-size YF3:Yb3+-Tm3+ particles showed enhanced NIR-to-UV UC compared to bulk material.
  • UV emission intensity increased rapidly as particle size decreased from 800 microm to 20 microm.
  • A clear correlation between decreasing particle size and increasing UC efficiency was observed.

Conclusions:

  • Particle size significantly influences the NIR-to-UV UC performance of YF3:Yb3+-Tm3+ materials.
  • Smaller microparticles exhibit superior UC properties, attributed to the small size effect.
  • The findings provide insights for designing efficient UC nanomaterials for various applications.