Lead-Free Halide Rb2CuBr3 as Sensitive X-Ray Scintillator
Lead-Free Halide Rb2CuBr3 as Sensitive X-Ray Scintillator
复制标题
无铅卤化物 Rb2CuBr3 作为灵敏 X 射线闪烁体
DOI：
10.1002/adma.201904711
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发表时间：
2019-09-18
影响因子：
29.4
通讯作者：
Tang, Jiang
中科院分区：
文献类型：
--
作者：
Yang, Bo;Yin, Lixiao;Tang, Jiang
闪烁体广泛应用于无损检测、医学成像和太空探索等许多领域的辐射检测。卤化铅钙钛矿闪烁体由于其发射波长可调、检测限低且易于制造，最近受到了广泛的研究关注。然而，这些钙钛矿的X射线照射光产率低和铅毒性严重限制了它们的实际应用。提出了一种新型无铅卤化物，即 Rb2CuBr3，作为具有极高光产额的闪烁体。 Rb2CuBr3 表现出一维晶体结构，具有很强的载流子限制和紫光发射中接近一致的光致发光量子产率 (98.6%)。高光致发光量子产率与自俘获激子发射的可忽略不计的自吸收以及强大的 X 射线吸收能力相结合，使得钙钛矿和相关闪烁体中的光产率达到创纪录的高光产率，约为每 MeV 91056 个光子。总体而言，Rb2CuBr3具有无毒性、高辐射发光强度和良好的稳定性，从而为低剂量放射成像的潜在应用奠定了良好的基础。
Scintillators are widely utilized for radiation detections in many fields, such as nondestructive inspection, medical imaging, and space exploration. Lead halide perovskite scintillators have recently received extensive research attention owing to their tunable emission wavelength, low detection limit, and ease of fabrication. However, the low light yields toward X-ray irradiation and the lead toxicity of these perovskites severely restricts their practical application. A novel lead-free halide is presented, namely Rb2CuBr3, as a scintillator with exceptionally high light yield. Rb2CuBr3 exhibits a 1D crystal structure and enjoys strong carrier confinement and near-unity photoluminescence quantum yield (98.6%) in violet emission. The high photoluminescence quantum yield combined with negligible self-absorption from self-trapped exciton emission and strong X-ray absorption capability enables a record high light yield of approximate to 91056 photons per MeV among perovskite and relative scintillators. Overall, Rb2CuBr3 provides nontoxicity, high radioluminescence intensity, and good stability, thus laying good foundations for potential application in low-dose radiography.