Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei Province, 430074, China.
College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei Province, 430074, China.
Adv Mater. 2019 Nov;31(44):e1904711. doi: 10.1002/adma.201904711. Epub 2019 Sep 18.
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 Rb CuBr , as a scintillator with exceptionally high light yield. Rb CuBr 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 ≈91056 photons per MeV among perovskite and relative scintillators. Overall, Rb CuBr provides nontoxicity, high radioluminescence intensity, and good stability, thus laying good foundations for potential application in low-dose radiography.
闪烁体在许多领域（如无损检测、医学成像和太空探索）的辐射探测中得到了广泛应用。卤化铅钙钛矿闪烁体由于其可调谐的发射波长、低检测限和易于制造，最近受到了广泛的研究关注。然而，这些钙钛矿对 X 射线辐照的光产率低，且铅具有毒性，严重限制了它们的实际应用。本文提出了一种新型的无铅卤化物，即 RbCuBr，它是一种具有高光产率的闪烁体。RbCuBr 具有一维晶体结构，在蓝紫色发射时具有很强的载流子限制和近乎 100%的光致发光量子产率（98.6%）。高的光致发光量子产率结合自陷激子发射的可忽略的自吸收和强的 X 射线吸收能力，使 RbCuBr 在钙钛矿和相对闪烁体中产生了高达 ≈91056 个每兆电子伏特的光产率纪录。总的来说，RbCuBr 提供了无毒、高光辐射强度和良好的稳定性，从而为在低剂量射线照相中的潜在应用奠定了良好的基础。
