Low-temperature synthesis of LiEuMo₂O₈ red phosphor for a white-light-emitting diode

Abstract

The Eu³⁺-activated double molybdate red phosphor, LiEuMo₂O₈ was prepared by a sol-gel process using inorganic salts as starting materials. A precursor prefired at 500°C for 240 min was subsequently annealed at 600°C for 240 min in Ar. The crystal structure, surface morphology and luminescent properties were analyzed by an X-ray diffractometer, a field emission scanning electron microscope and a fluorescent spectrophotometer. The obtained LiEuMo₂O₈ shows a strong excitation band near 395 and 466 nm and intensely red-emission lines at 616 nm corresponding to the ⁵D₀»⁷F₂ transitions on Eu³⁺ at 395 nm of light excitation.