Bi3+ ions doped double perovskite Ca2MgWO6 phosphor for yellow light emission

To develop new single-phase phosphor materials, a series of Ca2MgWO6:yBi3+ samples were successfully manufactured by high temperature solid state method. The microstructures and optical performances of the phosphors were investigated via X-ray diffraction, electron microscopy, as well as photoluminescence. The crystal lattice and morphology of the samples were adjusted by adding MgF2 flux. And the emission intensity of Bi3+ ions was enhanced by 21.4%. In addition, the characteristics emission of the [WO6] group was explored. Under excitation at 297 nm, [WO6] group possesses a broad emission band (350–550 nm) from W6+→O2− charge transfer band. Under 336 nm excitation, Ca2MgWO6:yBi3+ phosphors exhibit an ultra-wide emission band (400–800 nm) of Bi3+ ions. At the same time, Ca2MgWO6:yBi3+ phosphors have high quantum efficiency and absorption efficiency, and their maximum values reach 42.1% and 89.1%, respectively. All results suggest that Ca2MgWO6:yBi3+ phosphors might have potential applications in solid state lighting.