Synthesis and luminescence properties of red-emitting NaBaBi_2(PO_4)_3:Eu~(3+) phosphors

摘要

In this study, a series of Eu~(3+)-doped NaBaBi_2(PO_4)_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 Eu~(3+) concentrations are well matched with the NaBaBi_2(PO_4)_3 standard phase, indicating that Eu~(3+) 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 ~5D_0 → ~7F_2 electron transitions of Eu~(3+) ions. The optimum concentration of Eu~(3+) ions in NaBaBi_2(PO_4)_3∶Eu~(3+) is 9% concentration. The phosphor exhibits strong absorption capacity in the near-ultraviolet region. The Commission International de I'Eclairage chromaticity coordinates of the NaBaBi_2(PO_4)_3∶Eu~(3+) 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.