Enhanced red emission from BaMoO₄: Eu³⁺ by Bi³⁺ co‐doping

Abstract

A series of Bi ,Eu -doped BaMoO phosphors was synthesized using a hydrothermal method. The crystal structure, morphology and optical properties of the phosphors were studied using X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence (PL) measurements. Three different particle morphologies were detected in the SEM observation. The energy dispersive spectroscopy (EDS) results indicated that the solubility of Bi in spherical or rugby-like BaMoO particles was very low and the excess Bi element was cumulated in the irregular particles. Characteristic emissions of Eu ions ( D → F ; J = 0, 1, 2, 3, 4) were observed under excitation in ultraviolet (UV) light, with the most intense transition being the D → F transition. Energy transfer from MoO and Bi to Eu can be readily achieved. Red emission intensity of Eu was enhanced by a factor of two by co-doping with a small amount of Bi . Optical properties as a function of Bi content were studied and the optimum Bi content in BaMoO nanocrystals was determined to be 0.4 mol%.

Oxide-Based Red Emitting Phosphors with High Color Purity and Their Versatile Applications: Synthesis, Structure, and Luminescence Properties

“…The excited electrons thereafter deactivated nonradiatively by either transferring energy to the ground level or the excited level of the activator ion, Eu 3+ . From the different higher excited levels ( 5 H 6 , 5 L 6–7 , and 5 D 1–4 ) of Eu 3+ , energy comes to the lower excited level ( 5 D 0 ) by the nonradiative transition process . Finally, energy from the first excited level comes to the ground levels of Eu 3+ in the form of light in the visible region …”

“…From the different higher excited levels ( 5 H 6 , 5 L 6−7 , and 5 D 1−4 ) of Eu 3+ , energy comes to the lower excited level ( 5 D 0 ) by the nonradiative transition process. 46 Finally, energy from the first excited level comes to the ground levels of Eu 3+ in the form of light in the visible region. 47…”

Luminescence properties of self‐activated Ca5Mg3Zn(VO4)6 and Ca5Mg3Zn(VO4)6:xEu3+ phosphors

“…These results may be due to the strengthening effect of Eu 3+ on [VO 4 ] 3− fluorescence and energy transfer from [VO 4 ] 3− to Eu 3+ ions when europium ion concentration increased. [ 20,21 ]…”