Clock Glow

How does glow-in-the-dark stuff work? What is it made of?

For example, the glow-in-the-dark numbers/slashes on watches and clocks.

Phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to energized particles such as electrons). Basically it charges from sunlight and glows in the dark (your watch/clock example.

Phosphors are usually made from a suitable host material, to which an activator is added. The best known type is a copper-activated zinc sulfide and the silver-activated zinc sulfide (zinc sulfide silver).

Other glowing objects like toys etc use different combinations:

Calcium sulfide with strontium sulfide with bismuth as activator, (Ca,Sr)S:Bi, yields blue light with glow times up to 12 hours, [1] red and orange are modifications of the zinc sulfide formula. Red color can be obtained from strontium sulfide.

Mix of zinc sulfide and cadmium sulfide emit color depending on their ratio; increasing of the CdS content shifts the output color towards longer wavelengths; its persistence ranges between 1-10 hours.

Strontium aluminate activated by europium, SrAl2O4:Eu:Dy, is a newer material with higher brightness and significantly longer glow persistence; it produces green and aqua hues, where green gives the highest brightness and aqua the longest glow time.

etc etc etc

Hope that helps

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