Affordable Access

Publisher Website

Laser spectroscopy study of Cr3+and Mn4+ions in nanocrystalline MgO: Mechanisms of inhomogeneous broadening and symmetry of centers

Authors
Journal
Journal of Luminescence
0022-2313
Publisher
Elsevier
Volume
152
Identifiers
DOI: 10.1016/j.jlumin.2013.12.003
Keywords
  • Dielectric Nanocrystals
  • 3D3Ions
  • Inhomogeneous Broadening
  • Fluorescence Line Narrowing

Abstract

Abstract Sol–gel technology-produced MgO:Cr3+ and MgO:Mn4+,Li+ nanocrystals (particle size ~5nm) were studied with laser spectroscopy techniques. The low-temperature fluorescence line narrowing (FLN) experiments were performed for the inhomogeneously broadened R-line of cubic Cr3+ centers. The observed spectra and their dependence on excitation wavelength are significantly different from that reported in literature for the bulk single crystals, and thus demonstrate specific inhomogeneous broadening mechanisms in nanocrystals. The nature of inhomogeneous broadening of spectral lines of impurity ions in nanocrystals is discussed. The site-selective spectroscopy of MgO:0.02%Mn,0.4%Li nanocrystals (Li added for charge compensation) showed that no lines in the emission spectra can be ascribed to Mn4+ centers with cubic symmetry.

There are no comments yet on this publication. Be the first to share your thoughts.