VUV spectroscopy of pure LiCaAlF6 crystals

✍ Scribed by M. Kirm; M. True; S. Vielhauer; G. Zimmerer; N.V. Shiran; I. Shpinkov; D. Spassky; K. Shimamura; N. Ichinose

• Book ID: 104065574
• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 235 KB
• Volume: 537
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2004.08.029

✦ Synopsis

Reflection, excitation and luminescence spectra of as-grown and X-ray irradiated high-purity LiCaAlF 6 crystals were studied in the temperature range of 10-300 K using synchrotron radiation in VUV. The intrinsic luminescence of samples at 10 K consists of a non-elementary broad band with maximum at 4.4 eV under excitation at 11.45 eV. It is ascribed to the radiative decay of self-trapped excitons. The energy gap is estimated to be 12.65 eV in LiCaAlF 6 . Under interband excitation a red shift of luminescence was observed. The electron-hole recombination leads to the emission peaking at 3.7 eV. The excitation processes and origin of overlapping emissions of LiCaAlF 6 are discussed.