Ultrahigh Sensitivities of Dual-Mode Self-Calibration Pressure-Sensing Phosphors Lu₃Al₅O₁₂:Tb³⁺/Eu³⁺,Mn⁴

As the research on static high-pressure technology progresses, the demand for efficient and accurate pressure-sensing phosphors has been growing. In this Article, a dual-mode self-calibrated pressure-sensing system was achieved by introducing Tb³⁺/Eu³⁺ and Mn⁴⁺ ions with independent emission peaks into the Lu₃Al₅O₁₂ (LAG) garnet structure. The first mode was based on the red-shift of the Mn⁴⁺ emission peak under high pressure, with the sensitivity (dλ/dP) of the peak position calculated to be 0.85 and 0.86 nm GPa^-1, respectively. The second mode was founded on the different pressure dependence of the emission intensities of Tb³⁺/Eu³⁺ and Mn⁴⁺ ions, yielding relative sensitivities of 40.25% and 15.79% GPa^-1, respectively. These sensitivities were computed by fluorescence intensity ratio (FIR) technology. The relative sensitivities of LAG:Tb³⁺,Mn⁴⁺ are significantly higher than those of any previously reported phosphors. Additionally, the LAG:Tb³⁺,Mn⁴⁺ phosphor facilitated the visual observation of pressure, and the Commission Internationale de l'Eclairage (CIE) chromaticity coordinates can shift from the orange zone (0.4207, 0.3923) to the green zone (0.3388, 0.4095) with an increase in pressure. This work offers a new perspective for the design of multimode pressure-sensing phosphors.