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The luminescence of LiLa1−xMxP4O12 (M = Ce3+, Eu3+, Tb3+, Bi3+) is measured. Only for the Ce3+ ion pronounced concentration quenching is observed. The spectra of pairs of activators differ slightly from those of isolated activators. The Bi3+ emission is strongly Stokes shifted and is ascribed to AX emission. The Sb3+ ion shows a very efficient luminescence in this host lattice with an unusually small Stokes shift.
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Blasse et al. (1982) studied this question.
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