Description: Luminiscence spectra of calcite activators Eu3+ and Mn2+, which is most common of them and also the most intense, glows in red range while Ce3+ and Pb2+ emits in the UV range. Note that none of them have the peak in 450-500 nm blue range, only radiation-induced center shows some low intensity in violet-blue range. image © M. Gaft et al., Luminescence Spectroscopy of Minerals and Materials, page 60

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