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This paper repons the fluorescence spectra of powder phosphors of LaOBr:Eu 3+ (in six concentrations). These phosphors are brightly fluorescent with a reddish-orange colour under a UV source and they are assigned to a transition ( 5 D 0 → 7 F 2 ) at 615 nm. Colour richness has been assessed by computing the colour coordinates [X, Y] by means of the CIE chromaticity...