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Title: Spectro-Temporal Ratiometric Strategy for Thermally Invariant Optical Manometry

Authors: K. Su, M. Szymczak, L. Mei, X. Pan, G. Zhang, M. Runowski, P. Woźny, Q. Guo, L. Liao, Z. Peng, L. Marciniak*

Journal: Advanced Materials

DOI: 10.1002/adma.202522909

Optical manometry provides noncontact pressure sensing but remains vulnerable to temperature-induced drift, where thermal expansion and nonradiative relaxation distort luminescence spectra and kinetics. We develop a spectro-temporal ratiometric approach that combines spectral and time-gated luminescence channels to decouple pressure and temperature responses and realize thermally invariant optical manometry. Using Y₃In₂Ga₃O₁₂:Cr³⁺ as a rigid-lattice host (D_q/B ≈ 2.2), lattice stiffness minimizes thermal sensitivity S_R,T, while ratiometric detection stabilizes pressure sensitivity S_R,p. The resulting thermal-invariance manometric factor (TIMF) = S_R,p/S_R,T reaches ≈7700 K·GPa⁻¹ in the spectral domain and ≈2500 K·GPa⁻¹ in the time-gated domain, with S_R,p up to 51%·GPa⁻¹. These values exceed ruby benchmarks by two orders of magnitude and surpass conventional lifetime analysis by ∼40 times, enabling accurate, self-referenced optical pressure mapping under extreme thermo-mechanical conditions. This work provides luminescent manometry from empirical calibration to a quantitative framework for thermally reliable sensing in coupled fields.

Details of this study can be found in a paper published in Advanced Materials.

This work was supported by the Foundation for Polish Science under the First Team FENG.02.02-IP.05-0018/23 project with funds from the 2nd Priority of the Program European Funds for Modern Economy 20212027 (FENG).