Nanodefects in YAG:Ce-Based Phosphor Microcrystals
| Autor: | Vitaliy Vaganov, Yangyang Ju, A. T. Tulegenova, V. M. Lisitsyn, Evgeniy Lipatov, L. A. Lisitsyna, E. F. Polisadova |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
фотолюминенценция
Photoluminescence Materials science spectra General Chemical Engineering катодолюминесценция Analytical chemistry chemistry.chemical_element Cathodoluminescence Phosphor 02 engineering and technology 01 natural sciences YAG:Ce Inorganic Chemistry Crystal Impurity 0103 physical sciences люминофоры lcsh:QD901-999 General Materials Science спектры nanodefect 010302 applied physics excilamp excitation cathodoluminescence Yttrium 021001 nanoscience & nanotechnology Condensed Matter Physics Full width at half maximum chemistry kinetics Ce [YAG] phosphors photoluminescence lcsh:Crystallography 0210 nano-technology Luminescence кинетика |
| Zdroj: | Crystals, Vol 9, Iss 9, p 476 (2019) Crystals Volume 9 Issue 9 |
| ISSN: | 2073-4352 |
| Popis: | The present paper focused on the study of spectral&ndash kinetic characteristics of luminescence in two batches of yttrium aluminum garnet (YAG):Ce-based phosphors synthesized in different years by two manufacturers: NPO &ldquo Platan&rdquo in Russia and &ldquo GrandLux&rdquo in the People&rsquo s Republic of China (PRC). Upon studying the structural characteristics of the phosphors&mdash elemental composition, morphology, and X-ray diffraction (XRD) patterns&mdash it was concluded that both types of YAG:Ce phosphors are highly imperfect. The presence of heterogeneities of different nature was accompanied by the introduction&mdash to compensate for charges and elastic stresses&mdash of intrinsic lattice defects during synthesis. There is a high probability of creating complex defects during phosphor synthesis. Luminescence properties (full width at half maximum (FWHM), spectral position of the emission peaks, excitation spectra of emission, emission decay time) are affected by the nearest environment of the luminescence center whereas the degree of correlation of defects (distance between the components of the donor&ndash acceptor pair) does not depend on the concentration of impurities, intrinsic defects, and their ratio. The results do not fit into the framework of existing ideas regarding the processes in phosphors as systems with widely distributed luminescence centers. The patterns obtained in the paper are discussed based on a hypothesis according to which a nanodefect phosphorus crystal phase is formed during the synthesis. |
| Databáze: | OpenAIRE |
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