Lanthanum oxychloride can be activated to show strong fluorescence under excitation by cathode rays. Bismuth as an activator gives a blue emission extending into the ultraviolet with the peak at 3580 Å; antimony a greenish white with the peak at 4960 Å, and samarium a reddish orange emission composed of a series of lines or narrow bands, the strongest of which are at 5640 Å, 5770 Å, 6060 Å, and 6510 Å. The phosphor activated with antimony has a blue emission when excited by 2537 Å.
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Frank E. Swindells (1954) studied this question.