Investigation on luminescence based optical temperature sensing behavior of Sr3MoO6:Eu3+/Tb3+

Eu3+ – Tb3+ co-doped Sr3MoO6 (SMO) phosphors have been synthesized by solid-state reaction. Powder X-ray diffraction (PXRD) and Scanning electron microscopy (SEM) were used for the characterization of the synthesized materials, and no significant structural changes have been observed. Photoluminescence (PL) was obtained under the 290 nm excitation where a strong energy transfer from host to active ions and weak energy transfer between the active ions with prominent emission from respective active ions. The fluorescence intensity ratio (FIR) was evaluated as a function of temperature in the range of 14 and 300 K using Eu3+/Tb3+ ratio to obtain absolute (SA) and relative (SR) sensitivities. SMO:Eu/Tb presented maximum SA of 0.0029 K−1 at 300 K and SR of 0.24% K−1 at 300 K, demonstrating that investigated system could be used in temperature sensing applications at low temperature.