The urgency for affordable and reliable detectors for ionizing radiation in medical diagnostics, nuclear control and particle physics is generating growing demand for scintillator devices combining efficient scintillation, fast emission lifetime, high interaction probability with ionizing radiation and mitigated reabsorption losses in large-volume/high-density detectors. To date, the simultaneous achievement of all such features is still an open challenge. Here we realize this regime with poly(methyl methacrylate) nanocomposites embedding CsPbBr3 perovskite nanocrystals as sensitizers for a conjugated organic dye featuring a large Stokes shift and a fast emission lifetime in the red spectral region. Complete energy transfer from the nanocrystals to the dye under both X-rays and α-particle excitation results in highly stable radioluminescence with an efficiency comparable to that of commercial-grade inorganic and plastic scintillators; an ~3.4 ns emission lifetime, competitive with fast lanthanide scintillators; and reabsorption-free waveguiding for long optical distances.

中文翻译：

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高效，快速且无重吸收的钙钛矿纳米晶体敏化塑料闪烁体。

在医学诊断，核控制和粒子物理学中，价格合理且可靠的电离辐射检测器的紧迫性，促使对闪烁器设备的需求不断增长，这些器件结合了高效的闪烁，快速的发射寿命，与电离辐射的高相互作用概率以及减轻了大体积/高剂量时的重吸收损失密度检测器。迄今为止，同时实现所有这些功能仍然是一个开放的挑战。在这里，我们通过嵌入CsPbBr3钙钛矿纳米晶体的聚甲基丙烯酸甲酯纳米复合材料作为共轭有机染料的敏化剂来实现这种机制，该共轭有机染料在红色光谱区域具有较大的斯托克斯位移和快速的发射寿命。在X射线和α粒子激发下，从纳米晶体到染料的完全能量转移导致了高度稳定的放射发光，其效率可与商业级无机和塑料闪烁体相媲美。约3.4 ns的发射寿命，可与快速镧系元素闪烁体竞争；和无重吸收波导，可实现长距离光学。