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-Z 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(9H-carbazol-9-yl)benzene and 9,9-dimethyl-9H-fluorene as triplet hosts to facilitate Dexter energy transfer to bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(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.

中文翻译：

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装载有氧化铪和磷光主客体的纳米复合闪烁体用于伽马能谱


伽马敏感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，高光输出和高 Z 组件的高负载之间通常需要权衡，这两者在伽马射线检测中都起着至关重要的作用。这项工作利用三线态激子收集来增加伽马光产量，利用 1,3-二(9H-咔唑-9-基)苯和 9,9-二甲基-9H-芴作为三线态主体，促进 Dexter 能量转移到双[2-(4,6-二氟苯基)吡啶基-C2,N](吡啶基)铱(III) (FIrPic)，一种蓝光发射磷光染料。含有 20 wt% MF、10 wt% mCP 和 2 wt% FIrPic 的塑料闪烁体具有 14 800 Ph/MeV 的高伽马光产率。将 20–35 wt% 的氧化铪纳米粒子加入到这种有机基质中，得到的纳米复合材料在 662 keV 下的伽马光峰能量分辨率为 6.4–9.7%，同时仍保持 8800 至 10 800 Ph/MeV 之间的高伽马光产率。