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

Heer, Stephan; Kömpe, Karsten; U. Güdel, H.; Haase, Markus

doi:10.1002/adma.200400772

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

Shared by NobleBlocks on Dec 16, 2004 • 12:00 AM UTC

Authors:

Stephan Heer

Karsten Kömpe

H. U. Güdel

Abstract

Highly efficient photon upconversion in solution is demonstrated for the first time. Transparent colloidal solutions of Yb/Er and Yb/Tm doped NaYF4 nanocrystals show bright upconversion emission in the red, green, and blue spectral region by excitation around 1 μm with a laser of moderate power (see...

Subject

Photon upconversion

Nanocrystal

Materials science

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