Phosphor

A substance that exhibits the phenomenon of luminescence, emitting light after being exposed to radiant energy. This energy can come from various sources, including ultraviolet light, electron beams, or X-rays. The emitted light, or phosphorescence, continues for a duration after the energy source is removed, unlike fluorescence which stops almost immediately. Phosphors are commonly used in displays, lighting, and imaging technologies, playing a crucial role in how we see the world.

Phosphor meaning with examples

• The old television used a cathode-ray tube where a phosphor-coated screen emitted light when struck by electrons, creating the image we saw. Over time, the phosphor degraded leading to dimming and color shifts.
• Scientists are constantly developing new phosphors for energy-efficient LED lights. The quality of the phosphor determines the color rendering and overall performance of the LED, affecting the efficiency of our lightbulbs.
• Medical imaging techniques like X-rays rely on phosphors in the image intensifier to convert X-ray photons into visible light, allowing doctors to see internal structures. This enables us to see what's going on inside.
• Glow-in-the-dark toys often use phosphorescent materials. These phosphors absorb ambient light and then slowly release it, giving them their characteristic glow. This makes them fun for kids to use.