Synthesis And Characterization Of Er3+-Doped Srnb2o6 Phosphor For Fir Based Thermometer

A new optical thermometer material-Er3+-doped SrNb2O6-based on the fluorescence intensity ratio was synthesized and investigated by both theoretical calculation and experimental measurement, combining X-ray diffractometry (XRD), XRD Rietveld refinement, scanning electron microscopy, X-ray photon emission spectroscopy, photoluminescence (PL) and PL excitation of qualitative and quantitative analysis, to develop a novel green-emitting phosphor with excellent thermometry sensitivity. The Er3+ ions occupied 4e sites of SrNb2O6, and the stable activator occupation induces luminescence properties of emissions at 525, 531, and 550 nm. The SrNb2O6: Er3+ phosphor possesses an outstanding thermal sensitivity in the measurement region of 298-523 K, where S-a and S-r can achieve 6.15 x 10(-3) K-1 and 1093.2711/T-2, respectively, at 323 K. The optical thermal properties originated from the thermal excitation and formation of quashing thermal equilibrium between H-2(11/2) and S-4(3/2) levels, leading to photons on S-4(3/2) -> I-4(15/2) transfer process thermally populate onto H-2(11/2) -> I-4(15/2) transfer process. This work will lay a foundation for further exploration of activator suitability in columbite phosphors, making it practicable to foreseeably improve thermal sensitivity and PL for emergent applications in optical thermometer.