Preparation and luminescent properties of Ba3Na0.32Nb6O12(Si2O7)2:Eu3+ red phosphors with high color purity

Abstract

Rare-earth doped phosphors have received growing interest in the luminescence field, and hold great potential for lighting and display backlight applications. Nonetheless, the practical implementation of white light-emitting diodes requires the development of a cost-effective and high-performance red phosphor, which is still a significant challenge. In this paper, Eu³⁺ doped Ba₃Na_0.32Nb₆O₁₂(Si₂O₇)₂ red phosphors were prepared using a high-temperature solid-state method. The structure and phase purity of the samples were analyzed in detail by powder X-ray diffraction (XRD), structure refinement and energy dispersive spectroscopy analysis. Under 395 nm excitation, the phosphor exhibited an intense red emission due to the ⁵D₀ → ⁷F_J (J = 1, 2, 3, 4) transitions. Through decay curve measurements, it is found that the decay time corresponding to the double-exponential equation decreased with the increase of activator concentration. Theoretical calculations showed that the quadrupole–quadrupole interaction played a dominant role in concentration quenching. The CIE chromaticity coordinates of the phosphor were (0.6436, 0.3556) and the color purity reached 92.07%, indicating that the sample has high color purity. In addition, the temperature-dependent intensity was investigated in detail. The results demonstrated that Ba₃Na_0.32Nb₆O₁₂(Si₂O₇)₂:Eu³⁺ is a potential red-emitting phosphor for near-ultraviolet based white light-emitting diodes.