高产量、150皮秒聚合物闪烁体：通过协同Purcell效应与高Z增强
High-Yield, 150 ps Polymer Scintillators via Synergistic Purcell and High-Z Enhancement
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中文总结 AI 辅助
本研究开发了一种可溶液加工的混合聚合物闪烁体，通过嵌入HfO2纳米颗粒和Ag-SiO2纳米天线实现高光产额（6.1光子/keV）与约150皮秒超快时间响应，克服了传统塑料闪烁体的性能瓶颈。
中文摘要 AI 辅助
开发能够同时实现高光产额（LY）、超快时间响应和可规模化加工的塑料闪烁体，在辐射探测领域仍是一项艰巨挑战。在此，我们报道了一种可溶液加工的混合闪烁体，其在共轭聚合物平台内集成了高Z敏化与Purcell增强的辐射复合。通过将HfO2纳米颗粒和共振Ag-SiO2等离子体纳米天线嵌入聚(9,9-二辛基芴)基质中，我们利用了共轭聚合物固有的亚纳秒动力学，同时克服了其典型的低阻止能力。HfO2纳米晶体增强了能量沉积并抑制了链间聚集，在固态下保持了高光致发光量子产率。同时，纳米天线诱导强等离子体-激子耦合，将辐射衰变加速至约150皮秒。这种协同架构实现了光产额为6.1光子/千电子伏，与具有纳秒寿命的标准商业塑料相当，但比当前亚纳秒最先进材料高出一个数量级以上。这一性能代表了迄今为止报道的效率与时间分辨率最有利的组合之一。我们这种通用策略为下一代有机闪烁体提供了框架，将创纪录的时间响应与高效率相结合，用于先进的辐射传感架构。
英文摘要
Developing plastic scintillators that simultaneously achieve high light yield (LY), ultrafast timing, and scalable processability remains a formidable challenge in radiation detection. Here, we report a solution-processable hybrid scintillator that integrates high-Z sensitization with Purcell-enhanced radiative recombination within a conjugated-polymer platform. By embedding HfO2 nanoparticles and resonant Ag-SiO2 plasmonic nanoantennas into a poly(9,9-dioctylfluorene) matrix, we exploit the intrinsic sub-nanosecond kinetics of conjugated polymers while overcoming their characteristic low stopping power. The HfO2 nanocrystals amplify energy deposition and suppress interchain aggregation, preserving high photoluminescence quantum yields in the solid state. Simultaneously, the nanoantennas induce strong plasmon-exciton coupling, accelerating radiative decay to ~150 ps. This synergistic architecture yields LY=6.1 photons/keV, comparable to standard commercial plastics with nanosecond lifetimes, yet over an order of magnitude higher than current sub-nanosecond state-of-the-art materials. This performance represents one of the most favourable combinations of efficiency and timing resolution reported to date. Our versatile strategy provides a framework for next-generation organic scintillators, merging record-breaking temporal response with high efficiency for advanced radiation-sensing architectures.
发表机构
- Università degli Studi di Milano-Bicocca（米兰比可卡大学）
- INFN - Sezione di Milano - Bicocca（意大利国家核物理研究所米兰-比可卡分部）
- Istituto Italiano di Tecnologia（意大利理工大学）
- IMEM-CNR（CNR电磁学与材料研究所）
- Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca（米兰比可卡大学材料科学系）
- Dipartimento di Fisica, Università degli Studi di Milano-Bicocca（米兰比可卡大学物理系）
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