Luminescence
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Luminescence
Luminescence (pronunciation: /ˌluːmɪˈnɛs(ə)ns/) is a process of light emission by a substance not resulting from heat. It is thus a form of cold-body radiation.
Etymology
The term luminescence was first used in a scientific context by German physicist Eilhard Wiedemann in 1888. It is derived from the Latin 'lumen', meaning 'light'.
Types of Luminescence
There are several types of luminescence, including:
- Chemiluminescence: Light emitted during a chemical reaction.
- Bioluminescence: Light emitted by living organisms.
- Electroluminescence: Light emitted from an object due to an electric current or a strong electric field.
- Photoluminescence: Light emitted when a substance is excited by the absorption of photons.
- Radioluminescence: Light emitted when a substance is bombarded with ionizing radiation.
- Thermoluminescence: Light emitted by a substance heated after being exposed to radiation.
- Triboluminescence: Light emitted when a material is physically broken, crushed, or otherwise disturbed.
Related Terms
- Fluorescence: A type of luminescence where light is emitted by a substance after it has absorbed light or other electromagnetic radiation.
- Phosphorescence: A type of luminescence that occurs when energy absorbed by a substance is released slowly in the form of light.
- Incandescence: Light emission by a material as a result of being heated.
External links
- Medical encyclopedia article on Luminescence
- Wikipedia's article - Luminescence
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