The quantum efficiency of Dy 3+ ‐activated phosphors is reasonably high in lattices where a low activator concentration (≤ 1%) is already sufficient for effective energy transfer from the lattice to the activator ions. When more activator is needed for effective energy transfer, the quantum efficiency is limited due to concentration quenching of the Dy 3+ emission. The results are compared with those of corresponding Eu 3+ ‐ and Tb 3+ ‐activated phosphors.
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Sommerdijk et al. (1975) studied this question.