Red emitting phosphors play a significant role in accelerating the improvement of illumination quality for white light emitting diodes (WLEDs). In this work, by using solid-state reaction method, an efficient novel Ba₂LuNbO₆:Eu³⁺ phosphor with double-perovskite structure was successfully prepared. Here, a series of Ba₂LuNbO₆:Eu³⁺ red phosphors can be efficiently pumped by the near-ultraviolet (UV) light and then present high-brightness at orange emission (598 nm, ⁵D₀→⁷F₁) and red emission (610 nm, ⁵D₀→⁷F₂). The ratio values of 610 to 598 nm in Ba₂LuNbO₆:Eu³⁺ phosphors exceed 1 when the content of Eu³⁺ is larger than 0.4 mol, because the occupation of Eu³⁺ ions is changed from Lu³⁺ ions with symmetric sites to Ba²⁺ ions with asymmetric sites. Besides, the optimized concentration of Eu³⁺ at the ⁵D₀→⁷F₂ transitions is obtained when x = 1, indicating that there is non-concentration quenching in Ba₂LuNbO₆:Eu³⁺ phosphors. Moreover, the CIE chromaticity coordinates of Ba₂LuNbO₆:Eu³⁺ was calculated to be (0.587, 0.361), the color purity was calculated to be 72.26% and internal quenching efficiency (IQE) was measured to be 67%. Finally, the thermal stability of Ba₂LuNbO₆:Eu³⁺ phosphors was also studied. Our work demonstrates that the novel double-perovskite red-emitting Ba₂LuNbO₆:Eu³⁺ phosphors are prospective red emitting elements for WLEDs applications.

红色荧光粉在加速提高白光发光二极管 (WLED) 的照明质量方面发挥着重要作用。本工作采用固相反应的方法，成功制备了一种高效的新型双钙钛矿结构Ba 2 _LuNbO 6 _: Eu ^{3+荧光粉。}在这里，一系列 Ba ₂ LuNbO ₆ :Eu ³⁺红色荧光粉可以被近紫外（UV）光有效泵浦，然后在橙色发射（598 nm，⁵ D ₀ → ⁷ F ₁）下呈现高亮度，并且红色发射（610 nm，⁵ D ₀ →⁷楼₂ )。^{当Eu 3+}的含量大于0.4 mol时，Ba ₂ LuNbO ₆ :Eu ³⁺荧光粉中610到598 nm的比值超过1 ，因为Eu ³⁺离子的占据由Lu ³⁺离子对称改变。 Ba ²⁺离子具有不对称位点。此外，当x = 1时，获得了⁵ D ₀ → ⁷ F ₂跃迁处Eu ^{3+的最佳浓度，表明Ba} ₂ LuNbO ₆ :Eu 存在非浓度猝灭。³⁺荧光粉。_{此外，计算出Ba 2} LuNbO ₆ :Eu ³⁺的CIE色度坐标为（0.587，0.361），计算出色纯度为72.26%，测得内淬灭效率（IQE）为67%。最后，还研究了Ba ₂ LuNbO ₆ :Eu ^{3+荧光粉的热稳定性。}我们的工作表明，新型双钙钛矿发红光 Ba ₂ LuNbO ₆ :Eu ³⁺荧光粉是用于 WLED 应用的有前景的发红光元件。