Doping of rare-earth ions in a host is one of the important strategies to modify the microstructure and electrical and optical properties. This work demonstrated the significant improvement of luminescence and photocatalytic performances of Bi7O5F11 via Eu3+ doping. Bi7O5F11 has a typical Sillen–Aurivillius structure, which shows an intrinsic luminescence band peaked at 527 nm with a decay time of 0.041 µs. The intrinsic emission quenches in Bi7O5F11:Eu3+, which shows characteristic transitions from 5D0,1,2,3 levels to 7FJ (J = 0–4) ground states. An experimental red-LED lamp was successfully fabricated by encapsulating Bi7O5F11:Eu3+ with a transparent resin. Bi7O5F11 has poor photocatalytic ability, which just can happen under UV light irradiation. The fast decay time (0.041 µs) of Bi7O5F11 causes an efficient recombination of the light-induced charges, resulting in a lower photocatalytic effect. Bi7O5F11:Eu3+ shows the improved photocatalytic abilities compared with pure Bi7O5F11. 4f levels of Eu3+ provide a longer decay time (1 ms) for the excited states of Bi7O5F11, which prevents the recombination of the light-induced charges. Importantly, Eu3+ doping moves the required wavelength in photocatalytic reactions from UV light (pure Bi7O5F11) to visible wavelength in Bi7O5F11:Eu3+. Bi7O5F11:Eu3+ could be further investigated to develop a multifunctional bismuth material such as dielectric, photoelectric, and photochemical abilities.

中文翻译：

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Eu3+ 掺杂 Bi7O5F11 微孔板同时发光和改进的光催化

在主体中掺杂稀土离子是改变微观结构和电学和光学性质的重要策略之一。这项工作证明了通过 Eu3+ 掺杂显着改善了 Bi7O5F11 的发光和光催化性能。Bi7O5F11 具有典型的 Sillen-Aurivillius 结构，其固有发光带在 527 nm 处达到峰值，衰减时间为 0.041 µs。Bi7O5F11:Eu3+ 中的固有发射猝灭，显示了从 5D0,1,2,3 能级到 7FJ (J = 0–4) 基态的特征转变。通过用透明树脂封装 Bi7O5F11:Eu3+ 成功制造了实验性红色 LED 灯。Bi7O5F11 光催化能力差，只有在紫外光照射下才会发生。快速衰减时间（0. 041 µs) 的 Bi7O5F11 导致光诱导电荷的有效重组，从而导致较低的光催化效果。与纯 Bi7O5F11 相比，Bi7O5F11:Eu3+ 显示出改进的光催化能力。4f 能级的 Eu3+ 为 Bi7O5F11 的激发态提供了更长的衰减时间 (1 ms)，从而防止了光致电荷的复合。重要的是，Eu3+ 掺杂将光催化反应中所需的波长从紫外光（纯 Bi7O5F11）移动到 Bi7O5F11:Eu3+ 中的可见光波长。Bi7O5F11:Eu3+ 可以进一步研究以开发多功能铋材料，如介电、光电和光化学能力。4f 能级的 Eu3+ 为 Bi7O5F11 的激发态提供了更长的衰减时间 (1 ms)，从而防止了光致电荷的复合。重要的是，Eu3+ 掺杂将光催化反应中所需的波长从紫外光（纯 Bi7O5F11）移动到 Bi7O5F11:Eu3+ 中的可见光波长。Bi7O5F11:Eu3+ 可以进一步研究以开发多功能铋材料，如介电、光电和光化学能力。4f 能级的 Eu3+ 为 Bi7O5F11 的激发态提供了更长的衰减时间 (1 ms)，从而防止了光致电荷的复合。重要的是，Eu3+ 掺杂将光催化反应中所需的波长从紫外光（纯 Bi7O5F11）移动到 Bi7O5F11:Eu3+ 中的可见光波长。Bi7O5F11:Eu3+ 可以进一步研究以开发多功能铋材料，如介电、光电和光化学能力。