Molecule of the Month
|Highly Efficient Multicolour Upconversion Emission in Transparent Colloids of Lanthanide-Doped NaYF4 Nanocrystals|
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. These new systems show a substantial improvement on the order of 108 compared to previously reported systems.
This work was carried out in the group of Prof. Hans Ulrich Güdel.