Sensitized Luminescence of CaF[sub 2]:(Ce + Mn)

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Abstract
Calcium fluoride activated by cerium and manganese is shown to be a sensitized phosphor of high quantum efficiency. Studies of its reflection and excitation spectrum reveal that both cerium singlets and aggregates of cerium ions serve as sensitizers for manganese. The range of interaction (K) over which energy may be transferred from sensitizer to activator was found to be from 30 to 80 lattice sites. Variation in K with increasing sensitizer and constant manganese concentration is interpreted as being due to the competition of two types of sensitizing centers rather than to an energy transfer between sensitizer ions.

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