Bifunctional Luminescent Thermometer-Manometer Based on Cr-Cr Pair Emission.

Pressure dependence of spectral positions of the E → A and T → A bands of Cr ions, resulting from changes in Cr-O covalency and variations in crystal field strength, respectively, is commonly utilized in luminescence manometry. However, as demonstrated in this paper, the luminescence of Cr-Cr pairs shows insensitivity to pressure changes, making this signal suitable as a luminescence reference. The significant difference in the thermal and pressure dependences of luminescence with Cr occupying different crystallographic positions in CaAlO:Cr enables the development of a dual-function luminescence thermometer that operates in both ratiometric and lifetime-based readout modes.

Shortwave Ultraviolet Persistent Luminescence of SrMgSiO: Pr.

Currently, extensive research activities are devoted to developing persistent phosphors which extend beyond the visible range. In some emerging applications, long-lasting emission of high-energy photons is required; however, suitable materials for the shortwave ultraviolet (UV-C) band are extremely limited. This study reports a novel SrMgSiO phosphor doped with Pr ions, which exhibits UV-C persistent luminescence with maximum intensity at 243 nm.