Fluorescence spectra of Sm3+-doped rare earth oxybromide powder phosphors

The fluorescence properties of a new family of Sm3+-doped powder phosphors of GdOBr, (Gd0.9Y0.1)OBr, (Gd0.6Y0.4)OBr, (Gd0.3Y0.7)OBr, and YOBr are reported. The measured fluorescence spectra have been analysed by computing the colour coordinates ((X) over bar,(Y) over bar) and stimulated emission cross-sections (sigma(p)(E), cm(2)). These Sm3+-phosphors display bright reddish-orange colour due to transitions (4)G(5/2) --> H-6(9/2) (red) and (4)G(5/2) --> H-6(7/2) (orange) under a UV source. The relative fluorescence intensity ratios (red/orange) for the different measured emission levels were also evaluated in order to examine the Gd-Y, host composition effects on fluorescence behaviour. (C) 1999 Elsevier Science B.V. All rights reserved.