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. Subsequently, 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 −1 , 1.43 % °C −1 , 1.42 % °C −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.