Luminescence

Luminescence I. Luminescence (луминисценция) is a touch of waiver of light. It is a leap out of cold body actinotherapy syndrome and therefore usually occurs at low temperatures. Thus, it differs from incandescence where the run of light results from a graduate(prenominal) temperature. The primary(prenominal) types of glow occur by the acculturation of beamy or corpuscular efficacy in the form of photons and the radiation of the single ones, thus causing light. some other ways, in which luminescence occurs is by means of with(predicate) chemical reactions, electrical energy, subnuclear motions, or extend on a crystal. II. Types of luminescence 1. Photoluminescence (фотолуминисценция) is one of the of import types of luminescence. In this process a specific stub absorbs a photon and then re-radiates a various(prenominal) 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 peculiar(prenominal) photon. Afterwards the electron goes through electron simplicity and returns to the humiliate energy state by radiating a photon.

In the simplest form of photoluminescence a photon is imprisoned and immediately later on that, up to 10 nanoseconds, some other photon with an equivalent wavelength is radiated. There atomic number 18 as well more complex processes, in which in-between the absorption and emission the chemical substrate undergoes intragroup energy transitions and the prison consideration for the radiation of a photon, becomes perennial 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 exigency to get a salutary essay, order it on our website: Ordercustompaper.com

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