GdVO4:Er3+/Yb3+ nanocrystalline powder as fluorescence temperature sensor. Application to monitor the temperature of an electrical component

•Er3+/Yb3+ co-doped GdVO4 nanocrystalline powder was prepared.•The nanocrystals were calibrated with the temperature based on fluorescence intensity ratio and lifetime.•Temperature calibration with fluorescence intensity ratio have higher relative sensitivity than the one based on lifetime.•The nanocrystals were used to monitor the temperature of an integrated circuit when operating and not.