- noun radiation emitted by a substance at one wavelength following illumination at another wavelength
- Emission of light from material capable of storing received energy and retransmitting it after a time delay
- Visible light generated and emitted from a substance such as a phosphor by absorbing radiation of shorter wavelengths.
- The emission of electromagnetic radiation, such as light, by a body which has been excited by another form of energy, such as electron bombardment. Fluorescence is a form of luminescence whose persistence is less than about 10-8 second, while phosphorescence persists longer. That is, within 10-8 second or sooner from the excitation ceasing, so does fluorescence. Used, for instance, in spectroscopy, CRTs, and in lighting.
- noun the sending out of light from a substance which is receiving radiation