Design and synthesis of Sr3TaGa3Si2O14:Tb3+,Eu3+ phosphors for enhanced optical thermometry and multicolor anti-counterfeiting applications.

Optical thermometry has attracted significant interest due to its advantages of non-invasive nature, contact-free operation, and high spatial resolution. In this study, we developed and synthesized a novel series of Sr 3 TaGa 3 Si 2 O 14 :Tb3+,Eu3+ phosphors. Notably, the emission peak of Eu3+ ions was significantly enhanced by increasing the Tb3+ ion concentration under 368 nm excitation, facilitated by energy transfer between the ions. The distinct thermal quenching behaviors of Tb3+ and Eu3+ enabled an assessment of the temperature sensing capabilities of these phosphors, utilizing the fluorescence intensity ratio (FIR) of I 541nm / I 616nm , and achieving a maximum sensitivity of 0.76% K−1 at 498 K. Furthermore, by varying the Eu3+ ion concentration, these phosphors can achieve tunable multicolor emissions, making them ideal for anti-counterfeiting applications. These findings suggest that STGSO:Tb3+,Eu3+ phosphors are promising candidates for optical temperature measurement and customizable multicolor anti-counterfeiting technologies. [ABSTRACT FROM AUTHOR]