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The preparation and properties of the Group II metal pyrophosphates activated by tin are described. It is shown that the fluorescent emission is strongly dependent on the matrix shifting toward higher wave lengths with increasing size of the cation of the pyrophosphate. Excitation and emission spectra of many of the phosphors are given. The most useful of these phosphors is , a very efficient blue phosphor emitting at 452 mµ.
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Ropp et al. (1960) studied this question.
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