Synthesis and spectroscopic characterization of Ba2Sb2O7:Eu3+ orange-red emitting phosphor for WLEDs

•Orthorhombic weberite Ba2Sb2O7:Eu3+ phosphors were synthesized by solid-state reaction method.•Intense orange-red emission with warm CCT and high color purity was observed under NUV excitation.•Decay lifetime values of Eu3+ ions are in the millisecond range.•Concentration quenching was observed above 0.08 mol% via quadrupole–quadrupole interaction. A series of Eu3+ doped Ba2Sb2O7 phosphors were prepared by the solid-state reaction method. XRD analysis confirmed its orthorhombic structure with the space group Imma. The photoluminescence spectra implies that the phosphors exhibit characteristic emission peaks corresponding to 5D0→7FJ transitions of Eu3+ ions under NUV excitation. The CIE chromaticity coordinates reveal reddish-orange emission in the warm CCT region with high color purity. The mechanism for concentration quenching was found to be quadrupole–quadrupole interaction and the decay lifetime of the phosphors is in the millisecond range. The results suggest that the prepared phosphors are a potential candidate for phosphor-converted white light-emitting diodes and optoelectronic devices.