Cathodoluminescence properties of monoclinic phased reddish-orange emitting BaY2(MoO4)4:Eu3+ phosphor

Abstract

A series of Eu3+ activated BaY2(MoO4)4 reddish-orange emitting phosphors was successfully synthesized by changing the doping concentrations of Eu3+ ions using a solid-state reaction route. All the reflections obtained in the powder X-ray diffraction analysis signposted that the as-prepared phosphors belonged to the monoclinic phase with the C2/c space group. Narrow scan X-ray photoelectron spectroscopy analysis suggested that the molybdenum ions were connected tetrahedrally to oxygen with its maximum 6+ valance state and yttrium atoms with 3+ state in the BaY2(MoO4)4:Eu3+ material. The influence of doping concentration of Eu3+ ions on the cathodoluminescence (CL) properties of BaY2(MoO4)4 was explored with respect to various accelerating voltages and filament currents. The penetration depth of the electrons into the phosphors has been estimated as a function of accelerating voltage. The phosphor showed no saturation current or saturation voltage in the ranges that were explored. The CL spectra revealed that reddish-orange emission was witnessed when the phosphor material was stimulated under e− beam excitation due to the 5D0→7F2 transition of the Eu3+ ions. The as-prepared phosphor material exhibited intense and strong CL emission lines with better International Commission on Illumination (CIE) chromaticity coordinates and higher colour purity and can be considered to be utilize in field emission display device applications.