Highly‐Sensitive, Tri‐Modal Luminescent Manometer Utilizing Band‐Shift, Ratiometric and Lifetime‐Based Sensing Parameters

Abstract In addressing the broad spectrum of applications for optical pressure sensors, their predominant drawback lies in their limited sensitivity to pressure fluctuations. To overcome these constraints, this study introduces a luminescent manometer harnessing the emission properties of Cr³⁺ ions in Li₃Sc₂(PO₄)₃, operational in three distinct reading modes: spectral shift, ratiometric, and lifetime‐based. Notably, the conducted research establishes this luminescent manometer as the most sensitive reported to date in both spectra shift (λ/dp = 23.9 nm/GPa) and lifetime‐based (S_R = 93.56%/GPa) modes. A departure from conventional lifetime‐based luminescent pressure gauges, Li₃Sc₂(PO₄)₃:Cr³⁺ exhibits a prolongation of lifetime of the ⁴T₂ state correlated with increasing pressure. The advantages extend beyond sensitivity, encompassing a three‐fold surge in emission intensity with pressure escalation from ambient to 3 GPa, coupled with minimal susceptibility to temperature‐induced fluctuations. Unquestionably, Li₃Sc₂(PO₄)₃:Cr³⁺ showcases remarkable manometric performance, validating its significant application potential in diverse scenarios within the realm of optical pressure sensors.