Approaches to contactless optical thermometer in the NIR spectral range based on Nd3+ doped crystalline nanoparticles

The fluorescence kinetics and spectral intensity ratio (FIR) methods for contactless optical temperature measurement in the NIR spectral range with Nd3+ doped YAG micro- and YPO4 nanocrystals are considered and the problems are revealed. The requirements for good temperature RE doped crystalline nanoparticles sensor are formulated.