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.
Temperature sensitive paints (TSPs) are a class of rising materials for non‐contact temperature measurement technology. Efficient complexes with remarkable luminescent properties play the core role in TSPs. Rare earth organic complexes are often used as probe molecules for TSPs because of their long fluorescence lifetime, narrow fluorescence emission peaks, high fluorescence intensity, and large Stokes shift. Herein, two europium‐based complexes, Eu(PCCA)3phen and Eu (PMCA)3phen, were synthesized under hydrothermal conditions, using europium(III) oxide (Eu2O3), p‐chlorocinnamic acid (PCCA), p‐methoxy cinnamic acid (PMCA) and 1,10‐phenanthroline (phen) as raw materials. Two temperature sensitive paints (Eu(PCCA)3phen/PMMA and Eu(PMCA)3phen/PMMA) were obtained by the polymerization of methyl methacrylate (MMA) with different europium complexes. The structure, morphology, luminescent properties of the europium complexes and temperature quenching properties of the TSPs were characterized by infrared (IR) spectroscopy, scanning electron microscopy (SEM), and fluorescence spectroscopy. The fluorescence results show that both of the two TSPs have good temperature quenching performance in the range 20–100°C with high sensitivity 50–60°C and 80–90°C, respectively. Furthermore, the highest sensitivity of Eu(PCCA)3phen/PMMA is greater than that of Eu(PMCA)3phen/PMMA. This work can provide a universal way for preparing efficient TSPs in practical applications.
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