It is shown that the contrast of a narrow‐line emitting cathodoluminescent
normalZnS:normalEr,normalCu
phosphor may be considerably improved through the use of a spectral filter whose bandpass is coincident with the phosphor emission spectrum. Such enhancement is due to the selective exclusion of ambient light not in the spectral region of the phosphor emission. The erbium‐activated zinc sulfide phosphor reported here has a primary emission from the
2H11/2→4I15/2
transition. The contrast enhancement of the rare earth phosphor achieved through the utilization of this method is reported. It is compared with the contrast enhancement of P‐2, a broadband emitting phosphor. It is shown that the efficiency requirement for the rare earth phosphor is considerably less than that of the broadband emitting phosphor, for the same degree of viewability.
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