PHOTOLUMINESCENCE SPECTRA OF LAOBR-EU3+ POWDER PHOSPHORS

This paper reports the fluorescence spectra of powder phosphors of LaO Br:Eu3+ (in six concentrations). These phosphors are brightly fluoresc ent with a reddish-orange colour under a UV source and they are assign ed to a transition (D-5(0) --> F-7(2)) at 615 nm. Colour richness has been assessed by computing the colour coordinates [(X) over bar, (Y) o ver bar] by means of the CIE chromaticity diagram. The relative fluore scence intensity ratios (R) for the different fluorescent bands measur ed have also been determined. (C) 1998 Elsevier Science S.A.