Li Yucheng, Yang Xuechun, Ren Kuan, Liu Yulin, Xu Zhan, Feng He, Deng Keli, Deng Bo, Shang Wanli, Dong Jianjun, Wang Feng, Li Qianli, Yang Xuyong
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China.
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China.
ACS Appl Mater Interfaces. 2024 Oct 30;16(43):58827-58837. doi: 10.1021/acsami.4c11478. Epub 2024 Oct 15.
X-ray imaging has garnered widespread interest in biomedical diagnosis and nondestructive detection. The exploration of radio-photoluminescence has hastened the advancement of X-ray information storage. However, significant challenges persist in achieving the prolonged imaging of curved objects without attenuation. Here, europium-doped strontium fluoride (SrF:Eu) is meticulously created to exhibit a linear response to an extensive range of X-ray doses (maximum dose > 5000 Gy), showcasing excellent X-ray information reading/erasing reusability properties (10 cycles). This is accompanied by a red-to-blue emission transition under UV excitation, sustaining for 150 days without attenuation. To elucidate the phenomena of irradiated photoluminescent discoloration and the reversible X-ray storage of SrF:Eu, we propose an electron-vacancy trap (valence conversion) mechanism, information stably retained by the SrF:Eu-based device under ambient conditions due to high energy barriers. The time-lapse readout capability is further demonstrated for three-dimensional imaging of curved objects (10 lp mm) based on SrF:Eu embedded within a polydimethylsiloxane (SrF:Eu@PDMS). The SrF:Eu demonstrates time-lapse imaging, reversible radio-photoluminescence, and recoverable X-ray storage, offering a promising avenue for optical information encryption and anticounterfeiting applications.
X射线成像在生物医学诊断和无损检测方面引起了广泛关注。对放射光致发光的探索加速了X射线信息存储的发展。然而，在实现对弯曲物体的长时间无衰减成像方面仍存在重大挑战。在此，精心制备了掺铕氟化锶（SrF:Eu），以使其对广泛的X射线剂量（最大剂量>5000 Gy）呈现线性响应，展现出优异的X射线信息读取/擦除可重复使用特性（10个循环）。同时，在紫外激发下会发生从红色到蓝色的发射转变，且持续150天无衰减。为了阐明SrF:Eu的辐照光致发光变色现象和可逆X射线存储，我们提出了一种电子-空位陷阱（价态转换）机制，由于高能垒，基于SrF:Eu的器件在环境条件下能稳定保留信息。基于嵌入聚二甲基硅氧烷（SrF:Eu@PDMS）中的SrF:Eu，进一步展示了对弯曲物体（10 lp mm）进行三维成像的延时读出能力。SrF:Eu展现出延时成像、可逆放射光致发光和可恢复的X射线存储，为光学信息加密和防伪应用提供了一条有前景的途径。
