Abstract
Since the mid-1990s, phosphors have played a key role in emerging solidstate white-lighting technologies that are based on combining a near-UV or blue solid-state light source with downconversion to longer wavelengths. Almost all of them used phosphorescreted a crystalline oxide, nitride, or oxynitride host that is appropriately doped with Gd, Ce or Eu. Activation of phosphors by rare earth elements, leads to the formation of defects in the lattice and due to the change in the luminescent properties. This paper presents the new original model of energy transfer in the YAG crystals, which is a good description of the possible luminescence transitions in crystals. The morphology, spectra and kinetics characteristics of the luminescence of industrial phosphor excited by electron and laser radiation were investigated. The obtained theoretical and practical data are good agreement with each other, and thus are of great interest for understanding the nature of luminescence.
Highlights
Scintillators and phosphors represent an extensive group of wide-band materials intended for visualizing high radiation fluxes and conversing ultraviolet (UV) radiation into visible radiation
At the moment more than half of all the generated light energy is obtained by using luminescence and visualization of high radiation fluxes, which have been used in many areas of science and technology – from medicine to high-energy physics
The luminescence center is an element of the structure of nanodefect, the main luminescence processes occur in the nanodefect
Summary
Scintillators and phosphors represent an extensive group of wide-band materials intended for visualizing high radiation fluxes and conversing ultraviolet (UV) radiation into visible radiation. The processes of conversion of excitation energy into visible radiation in phosphors and scintillators have been studied clearly insufficiently because of the complexity of the composition, different structures of the compounds and a wide variety of exist promising materials. The absorbed energy of the exciting radiation is transmitted from the matrix and the center of localized absorbed energy to the luminescence centers directly This assumption is well confirmed by studies of radiation-stimulated processes in crystal phosphors with a perfect structure and a small concentration of activators, which made it possible to develop luminescence theory [1,2,3,4,5] and ensure the development of applications using luminescence
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