A number of powder phosphors have been measured by a direct optical method. Results are compared with other published values. Although slight discrepancies are found for magnesium and calcium tungstate at the 2537Aå position, the maximum quantum efficiency for magnesium tungstate is in good agreement with the published values. Good agreement is also found for impurity ‐activated phosphors. New data are presented for a number of orthophosphates. The quantum efficiency curves decrease more rapidly than the absorption curves toward both longer and shorter wave lengths from the peak position. The peaks of the quantum efficiency curves lie at longer wave lengths than those of the absorption curves. Reasons for these differences are discussed.
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Uehara et al. (1960) studied this question.