Indiglo watches take energy from the watch battery and give it to the atoms in the zinc sulfide-copper compound. This energy is then given off as light. After the atoms give off this light they can be exactly the same as they were before they got the energy from the battery. Indiglo backlights typically emit a distinct greenish-blue color and evenly light the entire display or dial.
Timex watches generally fall in the affordable category. So in short, Timex is able to continue making quality durable watches at a great price point. Did it gradually stop working?
If so, the best guess is that you have the same problem that everyone else has. That gradually destroys the device. John, Indiglo watches take energy from the watch battery and give it to the atoms in the zinc sulfide-copper compound. This energy is then given off as light. After the atoms give off this light they can be exactly the same as they were before they got the energy from the battery.
People say that this Indiglo effect does wear out after long use, however. I bet what happens is a small amount of electromigration of atoms: under the influence of the electric field, atoms gradually get dragged out of position.
As Matt said, it's not that the chemicals are getting used up like in a battery or a fuel tank. It's more that they just wear out, like the mechanical parts of an engine. In principle, they gradually wear out just by random thermal diffusion of the atoms, but it sounds like the electrically driven motion is more important under normal use.
Follow-up on this answer. Related Questions. Still Curious? Is there some solution, or material that glows when an electrical current is passed through it?
The nightlight's bluish green light illuminates the entire dial of the watch evenly at the push of a button. The dial is coated with a compound of zinc sulfide mixed with copper, a substance which becomes luminescent when an electrical charge is applied.
This layer is sandwiched between two conductive layers which act as electrodes. As described in the Timex patent , you take a thin glass or plastic layer, coat it with a clear conductor, coat that with a very thin layer of phosphor, coat the phosphor with a thin plastic and then add another electrode. Essentially, what you have is two conductors a capacitor with phosphor in between.
When you apply to volts AC alternating current to the conductors, the phosphor energizes and begins emitting photons. Creating the high voltage can be a problem in a wristwatch. The watch has only a small 1. To produce the to volts, the transformer is used. By charging the primary coil of the transformer with a transistor that is switching on and off, the secondary coil rises to volts or so.
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