It has a much longer persistence than Zinc Sulfide does. Strontium Aluminate is newer - it's what you see in the "super" glow-in-the-dark toys. Two phosphors that have these properties are Zinc Sulfide and Strontium Aluminate. To make a glow-in-the-dark toy, what you want is a phosphor that is energized by normal light and that has a very long persistence.
The length of time that they glow after being energized (known as the persistence of the phosphor).The color of the visible light that they produce.
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