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.

Oxidation State and Local Structure of Chromium Ions in LaOCl.

LaOCl doped with 0-10 mol% Cr was synthesized by thermal decomposition of chlorides. X-ray diffraction (XRD) analysis revealed that incorporation of chromium results in a decrease of the lattice parameter and a simultaneous increase of the lattice parameter . The local structure of chromium ions was studied with X-ray photoelectron (XPS), X-ray absorption (XANES), multifrequency electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) spectroscopy techniques.