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Fluorescence - Wikipedia
Fluorescence occurs when a photon of the incoming radiation is absorbed by a molecule exciting it to a higher energy level followed by emission of light as the molecule returns to a lower energy state.

Fluorescence Definition and Examples - Science Notes and Projects
Fluorescence is a phenomenon where certain materials rapidly (around 10-8 seconds) emit light when they are exposed to specific types of electromagnetic radiation, typically ultraviolet (UV) light. Fluorescent materials are those that can exhibit this characteristic.

Fluorescence | Emission, Excitation & Photochemistry | Britannica
fluorescence, emission of electromagnetic radiation, usually visible light, caused by excitation of atoms in a material, which then reemit almost immediately (within about 10 −8 seconds). The initial excitation is usually caused by absorption of energy from incident radiation or particles, such as X-rays or electrons.

Basic Concepts in Fluorescence - Olympus
Fluorescence is the property of some atoms and molecules to absorb light at a particular wavelength and to subsequently emit light of longer wavelength after a brief interval, termed the fluorescence lifetime.

Fluorescence - Chemistry LibreTexts
Fluorescence, a type of luminescence, occurs in gas, liquid or solid chemical systems. Fluorescence is brought about by absorption of photons in the singlet ground state promoted to a singlet excited state. The spin of the electron is still paired with the ground state electron, unlike phosphorescence.

Fluorescence Definition & Meaning - Merriam-Webster
The meaning of FLUORESCENCE is luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost at once when the incident radiation stops; also : the radiation emitted.

Fluorescence Excitation and Emission Fundamentals
Fluorescence is a member of the ubiquitous luminescence family of processes in which susceptible molecules emit light from electronically excited states created by either a physical (for example, absorption of light), mechanical (friction), or chemical mechanism.

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