Brightness of Cathodo-Luminescence at Low Current Densities and Low Voltages

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Abstract
With artificial willemite as the luminescent substance, it is found that, for sufficiently low current densities, J, and for accelerating potentials, V, between 200 and 800 volts, the brightness of luminescence, B, is given quite accurately by B=KJV2. This empirical equation gives too high values if J exceeds a limiting value which depends upon the accelerating potential, and which becomes lower as the potential is raised. From 800 to 1500 volts the agreement is only approximate, B increasing somewhat more rapidly than the equation indicates. There is no indication of the existence of a “threshold” voltage for this material.