Quenching of the upconversion luminescence of NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup>and NaYF<sub>4</sub>:Yb<sup>3+</sup>,Tm<sup>3+</sup>nanophosphors by water: the role of the sensitizer Yb<sup>3+</sup>in non-radiative relaxationRiikka Arppe, Tero Soukka, Michael Schäferling et al.|Nanoscale|2015Cited by 334