Ionoluminesence of leueophanite

Henrik Friis, Adrian A. Finch, Peter D. Townsend, David E. Hole, Hassane El Mkami

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The luminescence of three natural samples of leucophanite (ideally, NaCaBeSi2O6F) has been investigated with ion-beam excitation and by electron spin resonance (ESR). A blue luminescence, ascribed to a defect associated with SiO4 or BeO4 tetrahedra, and an orange luminescence, ascribed to an Mn2+ center, dominates the emission. Further luminescence centers in the investigated wavelength range (200-1100 nm) include those related to Gd3+, Dy3+, Tb3+, Sm3+, Eu3+, Tm3+, and Nd3+. In spite of a sheet-like structure, leucophanite is relatively resilient to the ion implantation and beta-irradiation, compared with other minerals, but loss of luminescence intensity as a function of implantation show that some permanent defects are formed. No centers change their emission energy as a function of temperature in the investigated interval (40-300 K), but due to crystal-field interaction, a broadening of the Mn2+ emission band is observed with increasing temperature, and with low activator concentration. The variation in activator concentration is clearly seen from a pronounced concentration quenching. ESR data (9.7 and 188 GHz) show that Mn is only present in one crystallographic site and that the REE-richest sample has an additional signal with g similar to 2.003. No new defects could be seen with ESR in a beta-irradiated sample.

Original languageEnglish
Pages (from-to)254-260
Number of pages7
JournalAmerican Mineralogist
Volume92
DOIs
Publication statusPublished - Feb 2007

Keywords

  • ionoluminescence
  • leucophanite
  • ESIZ
  • REE
  • Mn2+
  • lanthanide
  • TIME-RESOLVED LUMINESCENCE
  • RARE-EARTH ELEMENTS
  • CASO4-DY PHOSPHOR
  • ALKALI FELDSPARS
  • CATHODOLUMINESCENCE
  • MINERALS
  • THERMOLUMINESCENCE
  • SPECTROSCOPY
  • DEPENDENCE
  • EMISSIONS

Fingerprint

Dive into the research topics of 'Ionoluminesence of leueophanite'. Together they form a unique fingerprint.

Cite this