Luminescence

Luminescence I. Luminescence (луминисценция) is a butt of emission of light. It is a leap of cold body beam of light therapy syndrome and therefore commonly occurs at low temperatures. Thus, it differs from incandescence where the emission of light results from a graduate(prenominal) temperature. The main theatrical roles of glow occur by the acculturation of glad or corpuscular energy in the form of photons and the radiation of the respective ones, thus causing light. Other ways, in which incandescence occurs is through chemical substance reactions, electrical energy, subatomic motions, or deal on a crystal. II. Types of luminescence 1. Photoluminescence (фотолуминисценция) is one of the main types of luminescence. In this process a specific substance absorbs a photon and indeed re-radi ates a respective photon. This occurs through photoexcitation, which is the excitation (възбуждане) of an electron to a high energy state in the substance by the engrossment of the particular photon. Afterwards the electron goes through electron simplicity and returns to the lower energy state by give out a photon.

In the simplest form of photoluminescence a photon is absorbed and flat later on that, up to 10 nanoseconds, another photon with an uniform wavelength is radiated. There atomic number 18 also much complex processes, in which in-between the absorption and emission the chemical substrate undergoes internal energy transitions and the prison term for the rad! iation of a photon, becomes longer and the photon itself has a different wavelength. 2. Fluorescence (флуоресценция) is a type of photoluminescence, in which the photon, released by the substance, has a longer wavelength than the wavelength of the photon initially...If you fatality to depict a full essay, order it on our website: OrderEssay.net

If you want to get a full information about our service, visit our page: write my essay