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Cathode ray irradiation of the pure Cd garnet (x = 0) yields an intense blue emission; activation with manganese results in an intense long‐lived yellow emission due to an energy transfer from defect centres to the activator. UV excitation of Cd3Al2Ge3O12: Mn results in an yellow emission as well. In the system Cd3−xCaxAl2Ge3O12 a complete series of solid solutions is formed. For higher Ca content (x > 1) the intensity of the defect and also the Mn emission is reduced considerably. The luminescence properties are studied as a function of the Cd/Ca ratio.

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