Can Rocks Really Glow? Fluorescence vs Phosphorescence Explained

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Fluorescence and phosphorescence are both forms of photoluminescence, where materials absorb light and then re-emit it, but they differ in how long the glow lasts. Fluorescent materials glow almost immediately when exposed to light and stop glowing as soon as the light source is removed. In contrast, phosphorescent materials absorb light and then release it slowly, allowing them to glow in the dark for a few seconds longer after the light is gone. This difference is due to the way electrons return to their normal state: in fluorescence, the return is quick and direct, while in phosphorescence, electrons get temporarily trapped in a higher-energy state and take longer to release their energy as light.

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