Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry

Photoluminescent temperature sensors based on gadolinium orthovanadate (GdVO4) doped with 10% ytterbium and 2% erbium are developed dispersed in different media (lubricant fluid, sol–gel glass, PDMS) to evaluate the best conditions for measurement. Two excitation modes considered: (i) visible by a downshifting (DS) process or (ii) NIR energy transfer upconversion (UC) between Yb Er. The luminescence intensity ratio (LIR) of thermally coupled Er3+ emission peaks varies linearly range 25–300 °C, this variation is reversible. impact laser power density thermometry via UC that has been verified GdVO4: Yb3+/Er3+ powders its dilutions (low high concentration) shows LIR highly dependent source intensity, environmental temperature, medium. When at concentration, leads significant laser-induced thermal heating. However, low effect no longer influenced intensity. In paper, we propose method directly measure heating correct error caused According these results, nanoparticles can be applied sensing even if occurs system.