Temperature invariant ratiometric luminescence manometer based on Cr3+ ions emission

• A new ratiometric pressure readout approach is proposed. • A highly sensitive ratiometric manometer is described. • Cr 3+ concentration modifies the crystal field strength. • LMTO:Cr 3+ allows for temperature invariant pressure readout. The dependence of the spectroscopic properties of the phosphor on the applied pressure enables the development of luminescent manomenters that allow remote readout and imaging of the pressure. Although the most widely used manometers for years have been those using pressure-induced spectral shift of the emission band, their main limitations are relatively low sensitivity for spectrally narrow emission lines or low readout precision for broadband phosphors. Taking advantage of the benefits of both these approaches, this paper proposes a ratiometric pressure-readout strategy that exploits spectral shift of the 4 T 2 → 4 A 2 emission band of Cr 3+ ions in Li 2 Mg 3 TiO 6 . The luminescent manometer developed in this way is characterized by a linear dependence of LIR on pressure in the range of 0-7.75 GPa pressure range and a relative sensitivity of S R =4.7%/GPa. Importantly, this manometer is characterized by insensitivity to temperature changes in the 123-563K. This novel approach will allow the development of a new group of highly sensitive luminescent manometers.