Enhanced Fluorescence of La³⁺, Gd³⁺ doped EuW₁₀ for Temperature sensing performance

Abstract

Using the luminescent properties of temperature-sensitive paints (TSPs) to monitor temperature is a new type of temperature measurement technology. Herein, Na 9 [EuW 10 O 36 ](EuW 10 ) molecules were doped with non-fluorescent rare earth metal ions (La 3 + and Gd 3 + ) to prepare Na 9 [Eu x La 1-x W 10 O 36 ](Eu x La 1-x W 10 ) and Na 9 [Eu x Gd 1-x W 10 O 36 ](Eu x Gd 1-x W 10 ) probe molecules. The doping of non-fluorescent rare earth metal ions (La 3 + and Gd 3 + ) will not change the structure of the parent EuW 10 . As the relative content of La 3 + ions increasing, the luminescent intensity of the Eu x La 1-x W 10 series decreases non-monotonically; as the relative content of Gd 3 + ions increasing, the luminescent intensity of Eu x Gd 1-x W 10 series decreases monotonically. Sub-sequently, Eu x La 1-x W 10 and Eu x Gd 1-x W 10 as probe molecules were added into methyl methacrylate (MMA) to obtain temperature-sensitive paints via polymerization process. In the range of 50°C to 100°C, the maximum relative sensitivity of temperature-sensitive paints EuW 10 /PMMA, Eu 0.9 La 0.1 W 10 /PMMA and Eu 0.7 Gd 0.3 W 10 /PMMA can reach 1.27 %°C À 1 , 1.43 %°C À 1 , 1.42 %°C À 1 , respectively. This study indicates that the temperature sensing characteristics can be enhanced by doping EuW 10 with non-fluorescent rare earth ions (La 3 + , Gd 3 + ), which can be promising materials used in more areas with high-precision temperature measurements.