What is the best kind of light to charge any glow-in-the-dark material?
Would a high powered LED be the best? If so, would it be best in ultraviolet? Please don’t pretend to know something you don’t.
Most plastic glow-in-the-dark objects do not glow internally, it is a finely divided pigment: copper-doped zinc sulfide (for pale green). The copper sites in zinc sulfide absorb blue and ultraviolet light (mostly high frequency), which creates an excitation in the electronic structure of the solid. In the phosphor of a fluorescent tube or a TV set, that excitation decays back into visible light (always slightly red-shifted in all cases) very quickly. (If you turn off a TV in a totally darkened room, you can see the screen glow in the dark for almost a minute). Copper-doped zinc sulfide can be engineered to decay very quickly (fractions of a second) and brightly. It can also be engineered to have much deeper electronic energy holes so that the conversion of excitation back to light requires hours to climb out – glow in the dark. All in all, it depends on the intensity of the glow produced, the amount of energy stored into the material’s lattice and the time of exposure to a high-intensity wavelength. the best source of ultraviolet light to charge your glow in the dark material would be the sun 
(its pretty easy to find, and it’s free!). Just let your objects in the sun for a while and they should be glowing in the dark in no time!. Glow sticks are different though, they require a loss of energy. So, place your glow sticks in a freezer to charge them.
Ultraviolet LED with phosphor paint
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