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Zinc sulfide containing copper at random zinc sites was prepared by radioactive decay of Zn65. Measurements indicate that the isolated copper impurities do not contribute to luminescent emission. Using a covalent model of zinc sulfide, and recognizing the acceptor‐donor nature of activators and coactivators, association of these impurities is found and the luminescent center is identified as second or third nearest neighbor associated activator‐coactivator pairs. The nearest neighbor pairs are transparent to 3650Aå radiation and have many of the characteristics necessary to account for edge emission.
Prener et al. (Sun,) studied this question.