What is Fluorescent dyes and its application?

What is Fluorescent dyes and its application?

Fluorescent dyes are substances that absorb light waves of a certain wavelength and emit light waves of another wavelength greater than the absorption of light. Most of them are compounds containing benzene ring or heterocyclic ring and with conjugated double bond. Fluorescent dyes can be used alone or combined into composite fluorescent dyes.

After absorbing ultraviolet or visible light, it can convert short-wavelength light into longer-wavelength visible light waves and reflect them out, showing shining bright colors. For example, acid eosin, fluorescent yellow, mercurochrome, and some disperse dyes. Most of them are compounds containing benzene ring or heterocyclic ring and with conjugated double bond.

Fluorescent dyes can be used alone or combined into composite fluorescent dyes. Among them, the composite fluorescent dye is a fluorescent dye synthesized using fluorescence resonance energy transfer technology, which is composed of a donor and an acceptor fluorophore molecules that are very close and energy can be transferred between each other. The composite dye is excited at the excitation wavelength of the acceptor molecule and emits a photon at the emission wavelength of the donor molecule. The development of fluorescent dyes is very rapid, and the fluorescent dyes that have been developed for scientific research and clinical applications have basically covered the entire spectral range from ultraviolet to visible light and infrared.

Fluorescent dyes are often used in the preparation of fluorescent dye products, as well as whitening agents in washing powders, various fluorescent road marking paints for indicating signals, fluorescent marking clothing, etc.

Other uses of fluorescent dyes include: Leaking sewage systems including water and industrial pollutants, connecting systems, measuring liquids discharged from power plants, leaks in toilets, monitoring of illegally connected sewage pipes, studying flow and mapping, and analyzing corrupted systems , In addition, it is also used for fiber fabric printing and dyeing, some special signs (such as dark symbols) and military tracking.