UVfluorescence

UV fluorescence, also known as ultraviolet fluorescence or UV-induced fluorescence, is a phenomenon where a substance absorbs ultraviolet (UV) light and then emits light at a longer wavelength, typically in the visible spectrum. This emission of light occurs almost instantaneously after the absorption of UV radiation. The specific color of the emitted light depends on the chemical composition of the substance.

This process is distinct from phosphorescence, where the emission of light is delayed after the UV source is removed. UV fluorescence is a physical process involving the excitation of electrons within the molecules of a substance. When UV photons strike these molecules, they provide enough energy to move electrons to a higher energy level. As these excited electrons return to their ground state, they release the excess energy in the form of photons of light.

UV fluorescence has numerous practical applications. In forensics, it's used to detect latent fingerprints, bodily fluids, and counterfeit currency. In geology, it helps identify minerals. In biology and medicine, fluorescent dyes are employed as tracers or labels in microscopy and diagnostic tests, allowing researchers and clinicians to visualize specific structures or molecules. The entertainment industry also utilizes UV fluorescence in fluorescent paints and inks for special effects. The intensity and color of UV fluorescence can be influenced by factors such as the concentration of the fluorescent substance, the intensity of the UV light source, and the presence of quenching agents.