Synthesis, Crystal Structure, and Luminescence Properties of CaY_2Ge_3O_(10):Ln~(3+), Ln = Eu, Tb

摘要

The crystal structure and luminescence properties of CaY_2Ge_3O_(10):Ln~(3+) (Ln = Eu, Tb) germanates synthesized via a conventional solid-state reaction and an ethylenediaminetetraacetic acid complexing process are studied. The CaY_(2-x)Ln_xGe_3O_(10) (Ln = Eu, Tb; x = 0-1.0, 2.0; Δx = 0.1) solid solutions have a monoclinic structure (space group P2_1/c, Z = 4), in which dopant ions occupy three nonequivalent non-centrosymmetric sites with different Ca~(2+)/Ln~(3+) ratios. The effect of the synthesis methods, dopant concentrations, and excitation wavelengths on the luminescence properties of the compounds obtained is determined.