Photoluminescence studies of Ce3+ doped phosphors: down/up-conversion luminescence

The paper reports on the synthesis and characterisation of Ce³⁺ activated Mg₃WO₆ phosphor, with variable (0.5 to 2.5 mol%) concentration of doping Ce³⁺. The sample is synthesised via the combustion method. The crystal structure is determined by the X‑ray diffraction analysis, which shows the monoclinic structure with a P 1 2/c1 space group. The phosphor surface morphology is analysed by scanning electron microscopy, which shows the non-uniform particle distribution. The EDX analysis confirms the proper formation of phosphor. Photoluminescence study shows that prepared phosphor exhibits both the down- and up-conversion phenomenon. The notable peak at 275 nm is mainly due to the effective transitions from 4f ground state of Ce³⁺ to the field-splitting levels of 5d state. The emission peak at 475 nm is mainly due to the transitions of 5d excited state to ²F_7/2 and ²F_5/2 ground states.