Measurements of the Absolute Radiative Efficiency of Cathodoluminescent Phosphors

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Abstract
The absolute efficiency of cathodoluminescent phosphors has been measured as a function of voltage and current density. The results are in good agreement with the highest values previously reported. Changes of slope in the luminance vs. voltage curves indicate that changes in the voltage dependence may occur at x‐ray excitation potentials; these observations are related to results reported by others for x‐ray excitation of scintillation crystals. The indications are that it may not be possible to assume that the intrinsic efficiency is independent of the kinetic energy of the incident electron beam unless the energy exceeds the x‐ray levels of the host.

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