Abstract Single-phased tunable white-emitting inorganic phosphors are important for fabricating high-performance white light-emitting diodes. Herein, we reported on the realization tunable white emissions from Bi3+ and Eu3+ ions co-doped Ba2Y5B5O17 phosphors by controlling the energy transfer process from Bi3+ to Eu3+ ions. In this paper, Bi3+ singly doped Ba2Y5B5O17 and Bi3+/Eu3+ co-doped Ba2Y5B5O17 phosphors were synthesized through the conventional high-temperature solid-state reaction method. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental mapping, photoluminescence (PL), and CIE color coordinates. Upon excitation by ultraviolet (UV) light at 345 nm, Bi3+ singly doped Ba2Y4.995Bi0.005B5O17 phosphors showed a broadband cyan emission with a maximum at 503 nm and a shoulder at 410 nm, due to 3P1→1S0 transition of Bi3+ ions. Concentration-dependent PL intensity study revealed that the Ba2Y5-xBixB5O17 phosphors had highest emission intensity at x = 0.005. In contrast, the Eu3+ singly doped Ba2Y4.2Eu0.8B5O17 phosphors exhibited dominant sharp red emission lines around 616 nm upon 396 nm UV excitation. Interestingly, efficient energy transfer from Bi3+ to Eu3+ ions was observed in Bi3+/Eu3+ co-doped Ba2Y4.995-yEuyBi0.005B5O17 phosphors. Consequently, after excitation at 345 nm into the Bi3+ 1S0→3P1 transition, the Ba2Y4.995-yEuyBi0.005B5O17 phosphors showed intense sharp red emissions around 611 nm of Eu3+ ions together with a broad cyan emission band centered at 410 nm and 503 nm due to Bi3+ ions. By changing the Eu3+/Bi3+ concentration ratio, tunable white emissions were achieved in Ba2Y4.995-yEuyBi0.005B5O17 phosphors. The corresponding CIE chromaticity coordinates of Ba2Y4.995-yEuyBi0.005B5O17 phosphors were tuned from cyan color (0.226, 0.350) to near white (0.309, 0.354) and ultimately to red color (0.640, 0.341) by gradually increasing the doping concentration of Eu3+ ions. Our results demonstrated that these as-prepared Bi3+/Eu3+ co-doped Ba2Y5B5O17 phosphors had promising application potential in UV-excited white light-emitting diodes.

中文翻译：

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Bi3+/Eu3+ 共掺杂 Ba2Y5B5O17 荧光粉通过紫外激发白光发光二极管的能量转移发出明亮的可调白光

摘要 单相可调白光无机荧光粉对于制备高性能白光发光二极管具有重要意义。在此，我们报道了通过控制从 Bi3+ 到 Eu3+ 离子的能量转移过程，实现了 Bi3+ 和 Eu3+ 离子共掺杂 Ba2Y5B5O17 荧光粉的可调白光发射。本文采用常规高温固相反应法合成了Bi3+单掺杂Ba2Y5B5O17和Bi3+/Eu3+共掺杂Ba2Y5B5O17荧光粉。制备的样品通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、元素映射、光致发光 (PL) 和 CIE 色坐标进行表征。在 345 nm 紫外 (UV) 光激发下，Bi3+ 单掺杂 Ba2Y4.995Bi0。由于 Bi3+ 离子的 3P1→1S0 跃迁，005B5O17 荧光粉显示出宽带青色发射，最大值为 503 nm，肩峰位于 410 nm。浓度相关 PL 强度研究表明 Ba2Y5-xBixB5O17 荧光粉在 x = 0.005 处具有最高发射强度。相比之下，Eu3+ 单掺杂 Ba2Y4.2Eu0.8B5O17 荧光粉在 396 nm 紫外激发下在 616 nm 附近表现出主要的锐利红色发射线。有趣的是，在 Bi3+/Eu3+ 共掺杂 Ba2Y4.995-yEuyBi0.005B5O17 荧光粉中观察到了从 Bi3+ 到 Eu3+ 离子的有效能量转移。因此，在 345 nm 激发进入 Bi3+ 1S0→3P1 跃迁后，Ba2Y4.995-yEuyBi0.005B5O17 荧光粉在 Eu3+ 离子的 611 nm 附近显示出强烈的锐利红色发射，以及集中在 410 nm 和 503 nm 的宽青色发射带，这是由于Bi3+ 离子。通过改变 Eu3+/Bi3+ 浓度比，Ba2Y4.995-yEuyBi0.005B5O17 荧光粉实现了可调白光发射。Ba2Y4.995-yEuyBi0.005B5O17 荧光粉的相应 CIE 色度坐标从青色 (0.226, 0.350) 调整到接近白色 (0.309, 0.354) 并最终通过逐渐增加 Eu3+ 掺杂浓度调整到红色 (0.640, 0.341)离子。我们的结果表明，这些制备的 Bi3+/Eu3+ 共掺杂 Ba2Y5B5O17 荧光粉在紫外线激发的白光发光二极管中具有广阔的应用潜力。341) 通过逐渐增加 Eu3+ 离子的掺杂浓度。我们的结果表明，这些制备的 Bi3+/Eu3+ 共掺杂 Ba2Y5B5O17 荧光粉在紫外线激发的白光发光二极管中具有广阔的应用潜力。341) 通过逐渐增加 Eu3+ 离子的掺杂浓度。我们的结果表明，这些制备的 Bi3+/Eu3+ 共掺杂 Ba2Y5B5O17 荧光粉在紫外线激发的白光发光二极管中具有广阔的应用潜力。