Persistent phosphors emitting in the ultraviolet (UV) spectral region have attracted great attention in recent years, owing to their promising potential in many advanced applications ranging from photocatalysis to phototherapy. Here, we report the development of a novel UVA emissive persistent phosphor by doping Bi³⁺ into a LiScGeO₄ host. The LiScGeO₄:Bi³⁺ persistent phosphor can be effectively charged using a standard 254 nm UV lamp and emits intense, long-lasting persistent luminescence peaking at 365 nm for longer than 120 h. Besides, the UVA persistent luminescence from the pre-irradiated LiScGeO₄:Bi³⁺ phosphor can be repeatedly rejuvenated by short-time photostimulation with low-energy white, red and near-infrared (NIR) light. The long-lasting UVA afterglow, together with the photostimulated persistent luminescence (PSPL) capability, makes the LiScGeO₄:Bi³⁺ phosphor an important element of persistent luminescence materials in the UVA spectral region. This UVA persistent phosphor is expected to find exciting applications in the fields of medical therapy and environmental research.

中文翻译：

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Bi3 +掺杂LiScGeO4荧光粉中的持久UV-A持久发光和光刺激持久发光

在紫外线（UV）光谱区域中发射的持久性磷光体由于在光催化到光疗等许多先进应用中具有广阔的发展前景，近年来受到了极大的关注。在这里，我们报告通过将Bi ³⁺掺杂到LiScGeO ₄主体中来开发新型UVA发光持久性荧光粉。LiScGeO ₄：Bi ³⁺持久性磷光体可以使用标准254 nm紫外灯有效充电，并在365 nm处发出强烈，持久的峰值发光，持续时间超过120 h。此外，从预辐照的LiScGeO ₄：Bi ³⁺发出的UVA持续发光。低能量的白，红和近红外（NIR）光可以通过短时光刺激来使荧光粉重复焕发活力。持久的UVA余辉，加上光刺激的持久发光（PSPL）能力，使LiScGeO ₄：Bi ³⁺荧光粉成为UVA光谱区域中持久发光材料的重要元素。这种UVA持久性磷光体有望在医学治疗和环境研究领域中找到令人兴奋的应用。