Photoluminescence and structural properties of NaBaBi2[PO4]3 an Eulytite-type orthophosphate doped with Sm3+ as new orange-red emitting phosphors

A series of NaBaBi2[PO4]3 doped with Sm3+ (NaBaBi2−x[PO4]3:xSm3+; x = 0.025, 0.05, 0.075, 0.1, 0.3, and 0.5) phosphors were prepared using a solid-state reaction method in the present study. To evaluate the crystallinity and purity of the phosphor, XRD analysis was employed. To establish the morphology and elemental analyses of the phosphors, FESEM with EDX was adopted. Investigations into the phosphors’ photoluminescence properties were extensively studied. The phosphor exuded many strong Sm3+ ion emission peaks, oriented at 563, 601, and 644 nm, respectively. The transition 4G5/2 → 6H7/2 of Sm3+ emits the most vivid orange-red light at 601 nm. According to Dexter’s hypothesis, quenching happens as a result of dipole–dipole interaction at x = 0.1, the ideal concentration of the Sm3+ doped phosphor. The critical distance for phosphor is 17.27 Å. It was established that the phosphor’s band gap is Eg = 4.25 eV for the undoped compound. The phosphors’ CIE chromaticity coordinate appears to have fallen in the orange-reddish spectral range. It’s possible to employ the Sm3+-doped phosphors found in NaBaBi2[PO4]3 as orange-red phosphors in white light-emitting diodes.