Enhanced luminescent properties in Eu3+-activated SrMoxW1-xO4 red-emitting phosphors for solid-state lighting and field-emission displays

We fabricated the trivalent Eu3+-activated SrMoxW1-xO4 phosphors by a high-temperature solid-state reaction technique. The prepared phosphors were characterized by X-ray diffraction patterns, field-emission scanning electron microscope images, luminescence decay curves, photoluminescence (PL) spectra, and cathodoluminescence (CL) spectra. Under the ultraviolet (UV) illumination, the emissions of Eu3+ ions with an intense peak at 615 nm were observed, indicating the Eu3+ ions occupied at the low symmetry sites without inversion in host lattices. With the addition of the Mo6+ ions, the emission intensity of the studied samples was increased and the optimum result was obtained when x = 0.9. The temperature-dependent PL emission spectra were measured to explore the thermal stability of the resultant compounds. The final products emitted visible red emissions with high color purity of 95.1%. The CL spectra revealed that the synthesized compounds also exhibited superior CL performance. These characteristics make the Eu3+-activated SrMoxW1-xO4 red-emitting phosphors a promising candidate for UV-based white light-emitting diode and field-emission display applications.