Luminescence of Ln³⁺ and WO ²⁺₂ ions in wolframylphosphate glasses

Abstract

We investigate the luminescent properties of potassium wolframylphosphate glasses doped with Eu³⁺, Tb³⁺, and Dy³⁺ ions whose luminescence is excited by donor-acceptor interaction between the active WO ²⁺₂ and Ln³⁺ ions, as well as the migration of energy in the subsystems of each type of the active ions. Comparison of the obtained data with the results of investigation of the spectroscopic properties of Ln³⁺ in uranylphosphate materials shows that a sufficiently high degree of the ionicity of bonds of Ln³⁺ with the atoms of its first coordination sphere is preserved in wolframylphosphate matrices. We show that three stages of the decomposition of electron excitations are typical of the WO ²⁺₂ ions in wolframylphosphate glasses doped with Ln³⁺ and two stages in nonactivated glasses. The electron excitation energy transfer in the WO ²⁺₂ −Ln³⁺ system occurs due to induction-resonance interaction.