Winardi Isabelle, Han Ziqing, Yu Hao, Surabhi Prabhav, Pei Qibing
Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States.
Chem Mater. 2024 May 7;36(10):5257-5263. doi: 10.1021/acs.chemmater.4c00805. eCollection 2024 May 28.
Gamma sensitive plastic scintillators are of critical importance in the fields of nuclear nonproliferation, medical imaging, and high energy physics. However, there is often a trade-off between high light yield and high loading of high- components, both of which play an essential role in gamma ray detection. This work takes advantage of triplet exciton harvesting to increase gamma light yield by utilizing 1,3-di(9-carbazol-9-yl)benzene and 9,9-dimethyl-9-fluorene as triplet hosts to facilitate Dexter energy transfer to bis2-(4,6-difluorophenyl)pyridinato-C2,Niridium(III) (FIrPic), a blue light emitting phosphorescent dye. A plastic scintillator containing 20 wt % MF, 10 wt % mCP, and 2 wt % FIrPic has a high gamma light yield of 14 800 Ph/MeV. Incorporating 20-35 wt % hafnium oxide nanoparticles into this organic matrix results in nanocomposites that demonstrate a gamma photopeak energy resolution of 6.4-9.7% at 662 keV while still retaining a high gamma light yield between 8800 and 10 800 Ph/MeV.
γ 射线敏感的塑料闪烁体在核不扩散、医学成像和高能物理领域至关重要。然而，在高光输出和高含量高原子序数组分之间往往存在权衡，这两者在 γ 射线探测中都起着至关重要的作用。这项工作利用三线态激子捕获来提高 γ 光输出，通过使用 1,3-二（9-咔唑-9-基）苯和 9,9-二甲基-9-芴作为三线态主体，以促进 Dexter 能量转移到双[2-（4,6-二氟苯基）吡啶-C2,N]（吡啶甲酸）铱（III）（FIrPic），一种蓝色发光磷光染料。一种含有 20 wt% MF、10 wt% mCP 和 2 wt% FIrPic 的塑料闪烁体具有 14800 Ph/MeV 的高 γ 光输出。将 20 - 35 wt% 的氧化铪纳米颗粒掺入这种有机基质中，得到的纳米复合材料在 662 keV 处显示出 6.4 - 9.7% 的 γ 光峰能量分辨率，同时仍保持 8800 至 10800 Ph/MeV 之间的高 γ 光输出。
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