A Comprehensive Study of Nuanced Properties of Dy3+-Doped Alkaline Earth Silicates for Noncontact Thermometry Applications

Abstract

Luminescence materials activated with rare-earth ions for use in optical thermometers and lighting have garnered increasing attention in recent times. In this work, the problem has been tried to resolve by preparing Ba₂ZnSi₂O₇: Dy³⁺phosphor. X-ray diffraction shows their structure as monoclinic which was further confirmed by Rietveld refinement techniques. Optical studies have been done to confirm their luminescence properties. Stimulated at 351 nm, the as-prepared phosphors show blue (469 nm) and yellow (577 nm) emissions. The ⁴F_9/2 ➔ ⁶H_J (J = 13/2, 15/2) transitions of Dy³⁺ ions are responsible for these emissions, and they were also utilized to optimize the dopant concentration. The latter has two types of fluorescence intensity ratios and a type of excitation intensity ratio with maximum relative sensitivities of 2.05% K⁻¹ and 1.96% K⁻¹, respectively. Using an optimized phosphor, which exhibits good optical temperature measuring capabilities, a temperature measurement model was constructed using the fluorescence lifetime (FLT), with a maximum value of S_R = 5.42% K⁻¹. The generated Dy³⁺-doped Ba₂ZnSi₂O₇ phosphors can thus be a good option for UV-excitable warm lighting systems and noncontact optical thermometry measurements, in the light of every experimental finding.