The red-emitting phosphors of Mn4+-activated A2MgWO6 (A = Ba, Sr, Ca) for light emitting diodes

Abstract A series of Mn4+ ions activated A2MgWO6 (A = Ba, Sr, Ca) phosphors, showing bright red emission peaks appeared around 700 nm under the excitation of 355 nm, were synthesized by the solid-state reaction. The crystal structures and photo-luminescent (PL) properties of these synthesized phosphors were deeply investigated with the aids of X-ray diffraction measurement (XRD), and the temperature dependent PL/decay curves in detail. The optimum doping concentration of Mn4+ ions in A2MgWO6 (A = Ba, Sr, Ca) lattices were studied through the relationship between the Mn4+ ions doping concentrations and the luminescent intensities. The thermal stability of the synthesized red-emitting phosphors was checked based on the temperature-dependent PL intensities ranging from 7 to 510 K. Comparative studies of the luminescent properties for Mn4+ ions in isostructural A2MgWO6 (A = Ba, Sr, Ca) lattice with double perovskite structure were studied. The results indicate that the synthesized red-emitting phosphors are the ideal choice for white light emitting diodes (W-LEDs).