A new phosphor system, composed of barium silicates—lead activated, is described. Phosphors in this system are excited by 2,537 Å radiation with emission of blue and blue‐green light. The effect of composition on the color of emission is discussed, with spectral energy distribution curves and x‐ray data being presented. It is shown that the output of these new phosphors is comparable with that of tungstates; they can be used to make white and daylight fluorescent lamps of excellent efficiency as well as blue lamps in more saturated colors than can be obtained with tungstates.
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K. Butler (1947) studied this question.