Synthesis and Luminescence of Europium-Containing Compositions Based on Yttrium Oxide and Oxyfluorides

By heating the products isolated from an ethyl acetate medium, luminescent europium-containing compositions based on yttrium oxyfluorides and oxide have been synthesized. The concentration of Eu3+ ions in the compositions was from 0.10 to 10 at % of the yttrium content. It has been shown that the (EuхY1–х)nOn–1Fn + 2, (EuхY1–х)OF, (EuхY1–х)2O3, and (EuхY1–х)5O4F7 phases are formed during the synthesis. The luminescence of the compositions is related to the 5D0 → 7Fj electron transitions of Eu3+ ions. It depends on the synthesis conditions, the type of matrix, the position of the Eu3+ ions in the crystal lattice, the excitation wavelength, and other factors.