Hydrothermal synthesis, characterization, and color-tunable luminescence properties of Bi2MoO6:Eu3+ phosphors

Abstract

In this paper, Bi₂MoO₆:Eu³⁺ phosphors were successfully synthesized via a facile, efficient hydrothermal synthesis process followed by a further calcination treatment without using any surfactants. The samples were analyzed by XRD, UV-vis absorption spectroscopy, photoluminescence (PL) and decay curve measurements. XRD patterns reveal that all the diffraction peaks could be indexed to well-crystallized orthorhombic structures. UV-visible diffuse reflection spectra of the prepared Bi₂MoO₆ and Bi₂MoO₆:Eu³⁺ indicate that they had absorption in the UV-light region. The luminescence spectra showed that Bi₂MoO₆:Eu³⁺ phosphors can be effectively excited by UV light (328 nm), and exhibited strong red emission around 613 nm attributed to the Eu^{3+ 5}D₀ → ⁷F₂ transition. Effects of Eu³⁺ concentration on lattice constants and PL were presented.