Zinc oxide phosphors may emit in four different bands, the ultraviolet near‐edge emission, the common green band (possibly involving sulfur), a yellow‐orange band due to selenium, and a red to near infrared band due to ammonia. About 10% of ZnO can be replaced by CdO with a corresponding shift, to lower energies, of the optical absorption edge, of the near‐edge emission, and of the green emission. The possibility of an impurity activation due to anion substitution is discussed.
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W. Lehmann (1968) studied this question.