Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan250061, P. R. China.
Inorg Chem. 2022 Dec 19;61(50):20647-20656. doi: 10.1021/acs.inorgchem.2c03584. Epub 2022 Dec 8.
Persistent phosphors emitting in the narrowband ultraviolet-B (NB-UVB) spectral region have aroused significant interest, owing to their special self-illuminating feature in realizing many advanced technological applications under excitation-free conditions, such as dermatological therapy and invisible optical tagging. Here, we focus our discussion on a new Gd-doped persistent phosphor, SrPO:Gd, which exhibits long-lasting NB-UVB persistent luminescence peaking at 312 nm for more than 24 h after charging by an X-ray beam. The NB-UVB light emission from the charged SrPO:Gd phosphor can be clearly detected by a UVB camera in bright indoor environment. More importantly, the enhancement of NB-UVB afterglow intensity and decay time can be observed under continuous photostimulation of polychromic indoor ambient light. Furthermore, applying charged SrPO:Gd phosphors as invisible optical taggants, clear and interference-free recognition of the encrypted message and location of different objects have been realized due to the lack of UVB light in bright indoor environment. The as-prepared SrPO:Gd persistent phosphor is expected to offer new directional solutions for the development and application of ultraviolet luminescence technology.
发窄带紫外-B（NB-UVB）光的余辉荧光粉引起了人们的极大兴趣，因为它们具有在无需激励条件下实现许多先进技术应用的特殊自发光特性，例如皮肤病治疗和不可见光学标记。在这里，我们重点讨论一种新的 Gd 掺杂余辉荧光粉 SrPO:Gd，它在充电后能发出长达 24 小时以上的 312nm 的 NB-UVB 余辉，其亮度可以在明亮的室内环境中通过 UVB 相机清晰地检测到。更重要的是，在多色室内环境光的连续光刺激下，可以观察到 NB-UVB 余晖强度和衰减时间的增强。此外，由于在明亮的室内环境中缺乏 UVB 光，因此可以应用充电的 SrPO:Gd 荧光粉作为不可见光学标记，实现对不同物体的加密消息和位置的清晰、无干扰识别。所制备的 SrPO:Gd 余辉荧光粉有望为紫外线发光技术的发展和应用提供新的方向。
