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首页> 外文期刊>Advanced Materials >Lead-Free Halide Rb_2CuBr_3 as Sensitive X-Ray Scintillator
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Lead-Free Halide Rb_2CuBr_3 as Sensitive X-Ray Scintillator

机译：无铅卤化物Rb_2CuBr_3作为灵敏的X射线闪烁体

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摘要

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.
机译：闪烁体在无损检测，医学成像和太空探索等许多领域被广泛用于辐射检测。由于卤化钙钛矿型闪烁体的发射波长可调，检测限低，易于制造，最近受到了广泛的研究关注。然而，这些钙钛矿对X射线辐射的光产率低，并且铅的毒性严重地限制了它们的实际应用。提出了一种新颖的无铅卤化物，即Rb2CuBr3，作为闪烁体，具有极高的光产率。 Rb2CuBr3具有一维晶体结构，在紫光发射中具有很强的载流子限制和近统一的光致发光量子产率（98.6％）。高的光致发光量子产率与自陷激子发射的可忽略的自吸收以及强大的X射线吸收能力相结合，使得钙钛矿和相对闪烁体的创纪录高光产率约为每MeV 91056光子。总体而言，Rb2CuBr3具有无毒，高辐射发光强度和良好的稳定性，从而为低剂量X射线照相的潜在应用奠定了良好的基础。

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