Synthesis and Study of Double NaYP2O7 Phosphates Doped with Rare-Earth Elements
摘要
The synthesis of double phosphates of different composition NaY1–xEuxP2O7 and NaY1–xTbxP2O7 (х = 0, 0.025, 0.05, 0.075, 0.1) is technologically implemented by using a solution or extract of initial component in a rosin melt. The compounds are characterized by X-ray diffraction analysis and luminescence spectroscopy. The monoclinic NaYP2O7 polymorph structure is retained after doping with Eu3+ and Tb3+ ions. The NaY1–xEuxP2O7 luminescence excitation spectra (λem = 615 nm) contain the intense broad band from the charge transfer О2– → Eu3+ at λmax = 260 nm. In the NaY1–xTbxP2O7 luminescence excitation spectrum (λem = 545 nm), the most intense band at ~235 nm is produced by the transition 4f8 → 4f 7 5d1 in the Tb3+ ion. Double europium phosphates NaY1–xEuxP2O7 luminesce in the region of 550–750 nm under excitation at λex = 260 nm, and the luminescence of phosphates NaY1–xTbxP2O7 occurs in the region of 530–565 nm at λex = 235 nm. The highest integral luminescence intensity is demonstrated by NaY0.95Eu0.05P2O7 and NaY0.95Tb0.05P2O7.