Funct. Mater. 2020; 27 (1): 197-202.
Synthesis of red phosphors based on double molybdates of rare-earth elements and monovalent metals
1National University of Food Technologies, 68 Volodymyrska St., 01033 Kyiv, Ukraine
2T. Shevchenko National University of Kyiv, 64/13 Volodymyrska St., 01601 Kyiv, Ukraine
3National University of Life and Environmental Sciences of Ukraine, 17 Heroyiv Oborony St., 03041 Kyiv, Ukraine
Formation and properties of isomorphously substituted red phosphors, Na1-xAgxY1-xEux(MoO4)2, x = 0.05-0.40 (1) with structure of scheelite, and K1-xTlxY1-xEux(MoO4)2, x = 0.10-0.40 (11) with structure of orthorhombic potassium-yttrium molybdate have been obtained. The wavelength of the principal luminescence line of the phosphors (1) is 617 nm, the time of luminescence quenching is 0.4·10-3 s; for the phosphors (11), such characteristics are 615 nm and (4.5±1.5)·10-3 s. The physical and chemical criteria for the choice of conditions for the synthesis of functional materials have been discussed.
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