Concepedia

Near-Infrared (NIR) to Red and Green Up-Conversion Emission from Silica Sol−Gel Thin Films Made with La<sub>0.45</sub>Yb<sub>0.50</sub>Er<sub>0.05</sub>F<sub>3</sub> Nanoparticles, Hetero-Looping-Enhanced Energy Transfer (Hetero-LEET):  A New Up-Conversion Process

Sri Sivakumar, Frank C. J. M. van Veggel, P. Stanley May

Journal of the American Chemical Society · 2006 · 197 citations · 22 references

DOI

Concepts

Abstract

Bright green and red luminescence has been generated with a 980 nm diode laser from silica sol-gel thin films made with La0.45Yb0.50Er0.05F3 nanoparticles through a newly described hetero-looping-enhanced energy-transfer (hetero-LEET) up-conversion process, which exhibits a power dependence similar to that of a photon avalanche (PA). The hetero-LEET mechanism is potentially more efficient than PA, ground-state absorption/excited-state absorption (GSA/ESA), and energy-transfer (ETU) mechanisms because it combines resonant ground-state absorption with a looping or feedback process.

References

22

Highly Efficient Multicolour Upconversion Emission in Transparent Colloids of Lanthanide‐Doped NaYF<sub>4</sub> Nanocrystals

Stephan Heer, Karsten Kömpe, H. U. Güdel et al. · Advanced Materials · 2004 · 1.3K citations

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Near-infrared Emission of Redispersible Er<sup>3+</sup>, Nd<sup>3+</sup>, and Ho<sup>3+</sup> Doped LaF<sub>3</sub> Nanoparticles

Jan W. Stouwdam, Frank C. J. M. van Veggel · Nano Letters · 2002 · 792 citations

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Novel materials doped with trivalent lanthanides and transition metal ions showing near-infrared to visible photon upconversion

J.F. Suyver, Annina Aebischer, Daniel Biner et al. · Optical Materials · 2005 · 620 citations

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In Vivo and Scanning Electron Microscopy Imaging of Upconverting Nanophosphors in<i>Caenorhabditis</i><i>elegans</i>

Shuang Fang Lim, Robert Riehn, William S. Ryu et al. · Nano Letters · 2005 · 529 citations

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Bright White Light through Up-Conversion of a Single NIR Source from Sol−Gel-Derived Thin Film Made with Ln<sup>3+</sup>-Doped LaF<sub>3</sub> Nanoparticles

Sri Sivakumar, Frank C. J. M. van Veggel, Mati Raudsepp · Journal of the American Chemical Society · 2005 · 517 citations

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