How do the glowing buttons in AC and other remotes work? How do they shine more when they are ‘charged’ from another strong light source like a flashlight?

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How do the glowing buttons in AC and other remotes work? How do they shine more when they are ‘charged’ from another strong light source like a flashlight?

In: Technology

I assume you are talking about phosphorescent light. So basically there is this really toxic chemical called phosphorus that can store energy. Specifically the energy of visible light and release it over long time.

It works similar to heat. Heat is electromagnetic radiation and when you shine this radiation on an object it absorbs it and gets hotter. When you stop the hot object will remain hot and for a time shine this electromagnetic radiation to it’s surroundings.

Phosphorus can do the same thing but the frequency of the radiation it can store is inside the visible spectrum.