The cathode‐ray efficiency of a variety of phosphors has been studied, including , , , and oxide hosts activated with Eu 3+ , Tb 3+ , and other rare earths. In addition to the basic measurement of efficiency at 10 kV, the voltage dependence was measured over the range 0.2–20 kV and analyzed following Gergely.
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Ludwig et al. (1970) studied this question.