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, Martin Kaiser et al.|Nanoscale|2015Cited by 334
Power-dependent upconversion quantum yield of NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> nano- and micrometer-sized particles – measurements and simulationsMartin Kaiser, Ute Resch‐Genger, Christian Würth et al.|Nanoscale|2017Cited by 161