What is phosphorescence?

Phosphorescence is when something glows even after you stop shining light on it.

Imagine you have a toy that lights up in the dark, like one of those glow-in-the-dark stickers you put on your bedroom wall. That's kind of what happens with phosphorescence. When you turn off the lights, the sticker still glows for a while because it stores some of the light energy and slowly lets it out.

When light hits something that’s phosphorescent, it absorbs the light like a sponge soaks up water. But instead of just reflecting the light right back, it holds on to it for a bit, kind of like when you hold your breath underwater. Then, when the light goes away, it starts releasing that stored energy as glow.

Think about a whiteboard marker. When you write with it in daylight, and then go into a dark room, sometimes the writing still shows up faintly, almost like it’s glowing. That's phosphorescence at work!

It’s not magic, just light playing hide-and-seek!