Abstract
A new class of cathodochromic materials, germanium‐doped sodalite:Br, are described. They exhibit both a bright luminescence at room temperature and a long lifetime, high contrast coloration mode. The effect of hydrogen annealing on the initial reflectance, luminescent intensity, and FB location are studied. The FB energy is shown to initially increase with increasing germanium concentration up to 9% and then to decrease with higher germanium concentration. A technique is outlined for determining the luminescence generated within a powdered sample that possesses an absorption band. This technique is used to determine the effect of electron beam coloration on the luminescent centers. It is shown that the formation of thermally erasable F centers quenches luminescent centers while the formation of optically erasable F centers does not.
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