Eu2+ and Mn2+ co-doped Lu2Mg2Al2Si2O12 phosphors for high sensitivity and multi-mode optical pressure sensing

Abstract

Rare earth and transition metal ion doped phosphors are gradually attracting extensive attention in the field of pressure sensors. However, the lower sensitivity and single-mode pressure sensing have a significant negative impact on practical applications. In order to solve the above problems, in this work, for the first time, high sensitivity and multi-mode optical pressure sensing were achieved by co-doping Eu²⁺ and Mn²⁺ ions in the Lu₂Mg₂Al₂Si₂O₁₂ (LMAS) host. The LMAS:Eu²⁺,Mn²⁺ phosphor has two independent high sensitivities, dλ/dP_(Eu²⁺) = 1.77 nm GPa⁻¹ and dλ/dP_(Mn²⁺) = 3.53 nm GPa⁻¹, related to Eu²⁺ and Mn²⁺ ions, respectively. In addition, the co-doping strategy proposed in this research significantly improves the pressure response range of the phosphors, and the decay degree of the overall integral intensity and the fluorescence intensity ratio (FIR) were first proposed to be used for pressure sensing. Taking what is mentioned above into account, the multi-mode optical pressure sensing can be realized with the use of the LMAS:Eu²⁺,Mn²⁺ phosphor.