Here, we report a series of Bi³⁺-doped Ba₂Y_1–xSc_xNbO₆ (0 ≤ x ≤ 1.0 mol) phosphors by using the traditional high temperature solid-state reaction. To achieve the structural and photoluminescent (PL) information, several experimental characterizations and theoretical calculations were carried out, including X-ray diffraction (XRD), Rietveld refinement, UV-visible diffuse reflectance and PL spectra, temperature dependent PL spectra, and density functional theoretical (DFT) calculations. The XRD results show that the Bi³⁺-doped Ba₂Y_1–xSc_xNbO₆ samples belong to the double-perovskite phase with a cubic space group of Fm3̅m, and the diffraction positions shift toward high diffraction angle when the larger Y³⁺ ions are gradually replaced by the smaller Sc³⁺ ions. In addition, the refined XRD findings show that the Bi³⁺ ions tend to substitute the Y³⁺ and Sc³⁺ sites in the Bi³⁺-doped Ba₂Y_1–xSc_xNbO₆ (0 < x < 1.0 mol) solid solutions. The PL spectra show that the emission positions of the solid solution samples tune from 446 to 497 nm with the increase of Sc³⁺ content, which can be attributed to the modification of crystal field strength around Bi³⁺ ions. Moreover, there is energy transfer from the Ba₂YNbO₆ host to Bi³⁺ ions, which is dominated by a resonant type via a dipole-quadrupole (d-q) interaction. The Ba₂Y_0.6Sc_0.4NbO₆:0.02 molBi³⁺ shows the strongest PL intensity under 365 nm excitation, with the best quantum efficiency (QE) of 68%, and it keeps 60% of the room temperature emission intensity when the temperature increases to 150 °C, meaning that the Ba₂Y_0.6Sc_0.4NbO₆:Bi³⁺ features excellent thermal quenching of luminescence. By combining this optimal sample with a commercial red-emitting Sr₂Si₅N₈:Eu²⁺ phosphor, and a commercial 365 nm UV LED chip, a white LED device, with the color temperature (CT) of 3678 K, color rendering index (CRI) of 67.9, and CIE coordinates at (0.371, 0.376), is achieved.

 在这里，我们使用传统的高温固相反应报道了一系列 Bi ³⁺掺杂的 Ba ₂ Y _{1– x} Sc _x NbO ₆ (0 ≤ x ≤ 1.0 mol) 荧光粉。为了获得结构和光致发光 (PL) 信息，进行了多项实验表征和理论计算，包括 X 射线衍射 (XRD)、Rietveld 精修、紫外-可见漫反射和 PL 光谱、温度相关 PL 光谱和密度泛函理论（DFT）计算。XRD结果表明，Bi ³⁺掺杂的Ba ₂ Y _{1– x} Sc _x NbO ₆样品属于双钙钛矿相，立方空间群为Fm 3̅ m ，当较大的Y ³⁺离子逐渐被较小的Sc ³⁺离子取代时，衍射位置向高衍射角方向移动。此外，精细的 XRD 结果表明，Bi ^3+离子倾向于取代^{Bi 3+}掺杂的^Ba 2 _Y 1– _{x Sc} x _NbO 6 ( ₀ < x < 1.0 mol) 固溶体。^{PL光谱表明，随着Sc 3+}含量的增加，固溶体样品的发射位置从446 nm调谐到497 nm ，这可以归因于Bi ³⁺离子周围晶体场强的改变。此外，存在从 Ba ₂ YNbO ₆主体到 Bi ³⁺离子的能量转移，这主要是通过偶极-四极 (dq) 相互作用的共振类型。Ba ₂ Y _0.6 Sc _0.4 NbO ₆ :0.02 molBi ³⁺在 365 nm 激发下显示出最强的 PL 强度，最佳量子效率 (QE) 为 68%，并且当温度升高到 150 °C 时仍保持室温发射强度的 60%，这意味着 Ba ₂ Y _0.6 Sc _0.4 NbO ₆ :Bi ³⁺具有优异的发光热猝灭。通过将此最佳样品与商用红色发光 Sr ₂ Si ₅ N ₈ :Eu ²⁺磷光体和商用 365 nm UV LED 芯片、色温 (CT) 为 3678 K 的白色 LED 器件相结合，显色性指数 (CRI) 为 67.9，CIE 坐标为 (0.371, 0.376)。