Cho Sangeun, Kim Sungwoo, Kim Jongmin, Jo Yongcheol, Ryu Ilhwan, Hong Seongsu, Lee Jae-Joon, Cha SeungNam, Nam Eun Bi, Lee Sang Uck, Noh Sam Kyu, Kim Hyungsang, Kwak Jungwon, Im Hyunsik
Division of Physics and Semiconductor Science, Dongguk University, Seoul, 04620 Republic of Korea.
Department of Radiation Oncology, Asan Medical Center, Seoul, 05505 Republic of Korea.
Light Sci Appl. 2020 Sep 7;9:156. doi: 10.1038/s41377-020-00391-8. eCollection 2020.
Compared with solid scintillators, liquid scintillators have limited capability in dosimetry and radiography due to their relatively low light yields. Here, we report a new generation of highly efficient and low-cost liquid scintillators constructed by surface hybridisation of colloidal metal halide perovskite CsPbA (A: Cl, Br, I) nanocrystals (NCs) with organic molecules (2,5-diphenyloxazole). The hybrid liquid scintillators, compared to state-of-the-art CsI and GdOS, demonstrate markedly highly competitive radioluminescence quantum yields under X-ray irradiation typically employed in diagnosis and treatment. Experimental and theoretical analyses suggest that the enhanced quantum yield is associated with X-ray photon-induced charge transfer from the organic molecules to the NCs. High-resolution X-ray imaging is demonstrated using a hybrid CsPbBr NC-based liquid scintillator. The novel X-ray scintillation mechanism in our hybrid scintillators could be extended to enhance the quantum yield of various types of scintillators, enabling low-dose radiation detection in various fields, including fundamental science and imaging.
与固体闪烁体相比，液体闪烁体由于其相对较低的光产额，在剂量测定和射线照相方面的能力有限。在此，我们报告了一种新一代高效且低成本的液体闪烁体，它是通过胶体金属卤化物钙钛矿CsPbA（A：Cl、Br、I）纳米晶体（NCs）与有机分子（2,5 - 二苯基恶唑）进行表面杂交构建而成。与最先进的CsI和GdOS相比，这种混合液体闪烁体在诊断和治疗中通常使用的X射线照射下，表现出明显极具竞争力的辐射发光量子产率。实验和理论分析表明，量子产率的提高与X射线光子诱导的电荷从有机分子转移到NCs有关。使用基于混合CsPbBr NC的液体闪烁体展示了高分辨率X射线成像。我们混合闪烁体中的新型X射线闪烁机制可扩展以提高各种类型闪烁体的量子产率，从而在包括基础科学和成像在内的各个领域实现低剂量辐射检测。
