VUV spectroscopy of pure and Sm2+ doped SrFCl crystals

• Published in: Physica Status Solidi. B: Basic Research Vol. 239; no. 1; pp. 246 - 250
• Main Authors: Kisand, Vambola, Kink, Rein, Kink, Ilmar, Jaaniso, Raivo, Martinson, Indrek
• Format: Journal Article
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.09.2003; WILEY‐VCH Verlag; Wiley
• Subjects: 71.35.Aa; 78.55.Hx; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Exact sciences and technology; Excitons and related phenomena; Frenkel excitons and self-trapped excitons; Fysik; Natural Sciences; Naturvetenskap; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physical Sciences; Physics; Solid alkali halides; Self trapping; Inorganic compounds; Strontium chlorides; Ternary compounds; Doping; Experimental study; Chlorides fluorides; Relaxation; Excitons; Samarium additions; Emission spectra; Excitation spectrum; Extreme ultraviolet radiation
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.200301811

The creation and relaxation of electronic excitations in pure crystalline SrFCl and Sm2+ doped SrFCl were investigated using vacuum ultraviolet (VUV) spectroscopic methods. In the emission spectra of pure SrFCl and SrFCl : Sm2+ a strong emission band in the vicinity of 4.7 eV was detected, connected to self‐trapped exciton (STE) having a Cl2− core. The threshold for creation of STE was detected at 8.5 eV in the excitation spectrum of pure SrFCl and at 7.6 eV for Sm2+ doped SrFCl. It was demonstrated that the excitation spectrum of Sm2+ emission is determined with direct excitation of a Sm2+ center below 7.6 eV and with excitation of the SrFCl host above 7.6 eV.