Group II–VI compounds, doped with trivalent erbium, were prepared with alkali‐metal compensators. Striking differences are found in the emission spectra, with respect to intensity and spectral character, and the suppression in host‐lattice‐emission in lithium‐compensated materials. The temperature dependence of the 4 S 3 → 4 I 15 / 2 and 2 H 11 / 2 → 4 I 15 / 2 transitions was studied. Emission appearing with 4 I 15 / 2 → 4 G 11 / 2 excitation was found and was assigned tentatively to the 2 H 9 / 2 → 4 I 13 / 2 transition. A model is proposed for the observed transitions.
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Larach et al. (1969) studied this question.