Fluorescence

Fluorescence (from Latin fluor - to flow, flow) is the ability of some substances (fluorophores) to absorb quanta of light or other electromagnetic radiation and then emit quanta of light of greater wavelength.

The phenomenon of fluorescence is associated with the presence of electronic states of different energies in fluorophore molecules. When a photon is absorbed, the molecule transitions to an excited state. Some of the absorbed energy is then dissipated non-radiatively as heat, and the molecule moves to a lower energy level. When a molecule transitions from this level to the ground state, a quantum of light is emitted.

Since part of the energy is lost non-radiatively, the energy of the emitted photon is less than the energy of the absorbed one. This leads to a shift in the spectrum of the emitted radiation to longer wavelengths compared to the spectrum of the exciting light. The phenomenon of fluorescence is widely used in science and technology.

Article Fluorescent radiation

Fluorescent (or fluorescent) radiation is a reaction or chemical process in which photons are emitted when excited by light, a molecule, or another substance with ionizing radiation. The energy required for fluorescence comes from the low kinetic energy of the very movement of the material's molecules or trapped electrons

The basic concept of fluorescence is that special substances emit a lot of light using small amounts of electrical voltage, direct current electricity, or rapid heat. This light is called fluorescence, and its energy comes from the light with which they were excited by themselves or other light sources. That is, the fluorescent itself is not a source of light, like absorbing light. The fluorescence reaction can be used in information displays, light printing, fiber optics, floodlights or lamps and so on.

Physically, it is very important to understand that the structure of the fluorescent body does not change when the substance is exposed to light. Over time and after irradiation with light, all matter looks exactly the same. However, the amount of substance that must be used to obtain the desired fluorescent intensity can vary greatly from one material to another.

It is also, in a sense, an electroluminescent reaction. This idea - using electric current (usually alternating current) to create certain types of artificial light - emitted, for example, by shiny foil - is already an old one, but was quite unknown some years ago. But now many materials produced or newly created under pressure, such as plastic, etc., can be used to excite light by exposing them to