High-sensitivity NaYF4:Yb3+/Ho3+/Tm3+ phosphors for optical temperature sensing based on thermally coupled and non-thermally coupled energy levels

The results show that the sensitivity of the NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ phosphors to temperature measurement is enhanced as well as the resolution, and the simultaneous action of multiple coupling energy levels can further improve the temperature precision.