| Abstract [eng] |
This work is divided into three distinct parts, the first of which is devoted to the synthesis and characterization of luminescent glass, the second to the synthesis and study of the material properties of yttrium iron garnets doped with cerium, lanthanum, neodymium, praseodymium, and the third to the study of the luminescent properties of yttrium aluminum garnet based on the amount of impurity chromium ions in its structure. In the synthesized glasses doped with europium ions, more than 50 % of the emission intensity was due to the emission of 5D0→7F2 transitions, making it possible to achieve a highly monochromatic light by varying the glass composition. The level of substitution in the sol-gel Y3-xLnxFe5O12 system was found to be dependent on the nature of the lanthanide element. Single-phase garnets with neodymium and praseodymium substitutions were successfully synthesized, but single-phase garnets substituted with cerium and lanthanum did not form under the conditions of this study. Two different types of chromium emission can be achieved in yttrium aluminum garnet matrix by varying dopant concentration and excitation wavelength. One type of emission was found to be spin forbidden, exhibits an increase in intensity with increasing concentration of luminescent centers. The other unique type of emission, which is broadband and exhibits an exponential decrease in intensity with increasing concentration of chromium ions, is designated 4T2→4A2. |
