Synthesis and Luminescence Properties of Eu³⁺ Doped High Temperature Form of Bi₂MoO₆

Abstract

This work reports on the luminescence properties of the Eu³⁺-doped high-temperature form of Bi₂MoO₆ by a solid-state reaction technique at high temperature. Various characterization methods including x-ray diffraction, scanning electron microscopic, Fourier transform infrared, and fluorescence spectroscopy measurements were utilized in order to investigate the phase purity and surface morphology as well as photoluminescence properties for as-prepared phosphors. The spectroscopic characteristics including excitation and emission spectrum, concentration quenching phenomenon, decay curves, and chromaticity coordinates are discussed in detail. The nature of the luminescence behavior of Eu³⁺ was understood in term of the Judd–Ofelt theory, and the luminescent quantum efficiency of ⁵D₀ → ⁷F₂ transition of Eu³⁺ was estimated. The as-prepared phosphors can be effectively excited with a 465-nm blue light, and exhibit a reddish-orange emission belonging to the prevailing ⁵D₀ → ⁷F₂ transition of Eu³⁺ with a decay time of milliseconds. This indicates that the Bi₂MoO₆:Eu³⁺ phosphors could have potential application in white light-emitting diodes (w-LEDs) based on blue LED chips.