Abstract
The influence of temperature on the near-infrared emission band corresponding to the radiative relaxation from 4I13/2 to 4I15/2 electronic states of Er3+ was investigated in Y2O3 powder prepared by combustion synthesis. We observed that the electronic population distribution among various Stark levels of 4I13/2 and 4I15/2 changes with temperature in a way that is favorable for temperature sensing based on the luminescence intensity ratio technique. We also observed that the absolute temperature sensitivity varies by around 300% depending on the Stark transitions of choice with the highest relative temperature sensitivity value being around 2 × 10−3 K−1 at room temperature. Optically induced heat was found to be negligible under our experimental conditions.
Published Version
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