In cathode ray tube experiment in order to check the direction of flow of electrons a hole was made in a note and behind it phosphorescent material zinc sulfide it was coated.
Why does zinc sulfide glow when hit by electrons? What causes this glow?
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Related: Why does zinc sulfide glow?; Why did scientists use a zinc-sulfide coated screen to detect the alpha, beta, and gamma radiation?; If cathode rays travel from the cathode to the anode how do they make zinc sulphide glow? – andselisk Aug 02 '19 at 06:44
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This is an example of phosphorescence. The Wikipedia page of zinc sulfide and phosphorescence can explain it better than I do, but in short, when zinc sulfide get hit by electrons, electrons transfer some of its energy to zinc sulfide and excites its electron. Zinc sulfide stores the energy for a while, then emit light when the electron goes back to its ground level.
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