Light emission from excited matter that is not simply its thermal radiation at the local temperature. Fluorescence is one form of luminescence.
A luminescent material, for example one that converts some of a blue light-emitting diode's light into longer wavelengths. The name does not require long-lived phosphorescence.
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Luminescence is the emission of light by a substance that has not been heated. It is a form of photonic emission that occurs when certain materials absorb energy and then release that energy in the form of light. This process can occur via various mechanisms, leading to different types of luminescence: 1. **Fluorescence**: A process where a material absorbs light or other electromagnetic radiation and quickly re-emits it.