The optical properties of Mn4+ ions in Ba2CaWO6 with double perovskite structure for optical thermometer application

• Published in: Materials research bulletin 2022-12, Vol.156, p.112004, Article 112004
• Main Authors: Wang, Zhiliang, Chen, Xu, Luo, Man, Qin, Lin
• Format: Article
• Language: English
• Subjects: Host lattice; Optical thermometer; Phosphors; Structure
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2022.112004

•Luminescence properties of Mn4+ ions were investigated based on the crystal structure;•The phosphor shows efficiency excitation band in the near UV wavelength region;•The luminescent properties and energy transfer process were deeply investigated;•The phosphors Ba2CaWO6:Mn4+ shows comparable luminescence thermal stability and QE;•The temperature sensing performance based on the FIR technique was characterized. A series of red-emitting phosphors Ba2CaWO6:xMn4+ were synthesized by solid-state method. The phosphors were characterized by X-ray diffraction (XRD), photo-luminescent excitation spectra (PLE), photo-luminescent emission spectra (PL), decay curves, and quantum efficiency (QE). The concentration-dependent PL spectra were measured to evaluate the optimum Mn4+ ion doping concentration. The energy transfer behavior between Mn4+ ions or Mn4+ ions and tungstate group [WO6] were measured in details. PL emission spectra recorded at different temperatures were introduced to quantify the thermal stability. The temperature dependent emission intensity ratio values were used in temperature sensing applications in the temperature region of 7 to 510 K. The obtained results indicate that the synthesized phosphors have the possibility to be used as an optical thermometer. In this work, the variation of the Stokes and anti-Stokes emission intensities with temperatures were introduced to evaluate the optical thermometry stability based on the luminescent properties of Mn4+ in the temperature region from 7 to 510 K. The Ba2CaWO6:0.3%Mn4+ phosphor showed good thermal stability with an emission intensity increase of 122% at 303 K and 150% at 453 K from that at 7 K. Further temperature sensing performance was obtained to be at 310 K, 0.016/K and 150 K, 0.0144/K for Sa and Sr, in the FIR technique respectively [Display omitted] .