Abstract
The rare earth oxysulfide phosphors of and were studied in phosphor storage cathode ray tubes for efficient cathodoluminescence. Because low energy electrons bombard the phosphor in these tubes, the surface efficiency of the phosphor is very important. At an air‐bake temperature of 500°C, showed a decrease in efficiency. X‐ray photoelectron spectroscopy determined that the formation of sulfate on the surface of the phosphor caused this loss in efficiency.

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