Abstract
Here, we investigate erbium (Er3+) doped yttrium silicate powders prepared by combustion synthesis and the effect of magnesium (Mg2+) on its structural and luminescence characteristics for application in optical thermometry in the near-infrared. Surface morphology and structure of the powders were investigated by X-ray powder diffraction, scanning electronic microscopy, infrared Fourier transform and Raman spectroscopy. CW laser excitation at the visible (λ = 532 nm) produced near-infrared emission corresponding to 2H11/2 → 4I13/2 and 4S3/2 → 4I13/2 electronic transitions of Er3+. Using the luminescence intensity ratio approach, which takes into account the thermal coupling among states 2H11/2 and 4S3/2, the optical temperature sensing performance was investigated in the range 298–673 K. Maximum sensitivity of ∼0.001/K was obtained at 510 K for near-infrared emission from the sample containing 8 wt. % of Mg2+ and 4 wt. % of Er3+.
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