Crystal structure and luminescence properties of Sr2Al6O11:Eu2+

Abstract

Eu2+ activated Sr2Al6O11 and Sr4Al14O25 were prepared with B2O3 additives at the temperatures of 1100°C to 1300°C in flowing 5% H2/Ar gas. These products were characterized by XRD analysis, UV and VUV spectroscopy and so forth. The precise crystal structure of Sr2Al6O11 was first determined by Rietveld method. Between the sheets of the edge shared AlO6 octahedron, the corner shared AlO4 tetrahedral linkages of Sr2Al6O11 demonstrated a quite different fashion than that of Sr4Al14O25. According to the UV-Vis. and VUV spectra, an intense broad emission was observed near 460 nm in Sr2Al6O11:Eu2+, and two emission peaks were recognized at 409 nm and 496 nm in Sr4Al14O25:Eu2+. It was found that such emission profile and the thermal degradation of luminescence were fairly sensitive to every structural characteristic.