The visual efficiency of a phosphor may be defined as the visual response produced by the phosphor per quantum of emitted light divided by the visual response per quantum at the maximum of the visibility curve for the eye. A simple mathematical expression is derived for this quantity that is valid for phosphors with an emission curve that can be represented by a Gauss error function. Families of curves are given that enable one to read off the visual efficiency of a phosphor, given the peak wave-length and half-width of its emission curve. When the peak of the emission curve is separated from the peak of the visibility curve by more than a critical value of about 400A, there is a value of the half-width of the emission curve different from zero for which the visual efficiency is a maximum.
© 1946 Optical Society of AmericaFull Article | PDF Article
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