Synthesis and luminescence properties of red-emitting NaBaBi₂(PO₄)₃:Eu³⁺ phosphors

In this study, a series of Eu³⁺-doped NaBaBi₂(PO₄)₃ red phosphors were synthesized by high-temperature solid-phase reaction method, and the phase structure and photoluminescence properties of the samples were investigated in detail. All the diffraction peaks of the phosphors with various Eu³⁺ concentrations are well matched with the NaBaBi₂(PO₄)₃ standard phase, indicating that Eu³⁺ ions have no effect on the host structure. Under the excitation of 391 nm wavelength, the emission spectra consisted of four characteristic emission peaks at 595, 617, 656 and 703 nm, respectively. The strongest emission peaking at 617 nm originates from the ⁵D₀ → ⁷F₂ electron transitions of Eu³⁺ ions. The optimum concentration of Eu³⁺ ions in NaBaBi₂(PO₄)₃:Eu³⁺ is 9% concentration. The phosphor exhibits strong absorption capacity in the near-ultraviolet region. The Commission International de I’Eclairage chromaticity coordinates of the NaBaBi₂(PO₄)₃:Eu³⁺ samples are located in the red region, indicating that the phosphors are suitable red component to applied in near-ultraviolet-based white light-emitting diodes.