亚50皮秒异常明亮的钙钛矿闪烁体通过解锁巨振子强度
Sub-50 Picosecond exceptionally Bright Perovskite Scintillation by Unlocking Giant Oscillator Strength
AI总结：
研究通过抑制激子-声子散射，在低温下解锁钙钛矿纳米晶体的巨振子强度，实现亚50皮秒超快闪烁，突破传统限制，达到13.11皮秒寿命和21851 ph/MeV发光效率。
摘要：
超快闪烁体对于高能物理和医学诊断中的精确计时至关重要。传统闪烁体受限于发光率与发光效率之间的权衡，仍被困在亚纳秒范围内，无法突破50皮秒限制。本文通过利用弱限域的CsPbCl3钙钛矿纳米晶体中的相干辐射加速效应，生成超快光子脉冲，该效应源于巨振子强度，通过在温和低温下抑制激子-声子散射解锁。由此，我们的闪烁体实现了前所未有的主导寿命13.11 ps和高发光效率21,851 ph/MeV。所获得的即时光子发射率比现有超快闪烁体高100倍以上。我们在真实检测场景中验证了这一突破，实现了30.8 ps的重合时间分辨率，并准确分辨13.5 ps电子束和16.6 ps单次伽马射线脉冲。我们的发现建立了一个稳健的相干框架，为下一代超快闪烁体奠定基础，推动极端辐射诊断进入皮秒前沿。
英文摘要：
Ultrafast scintillators are indispensable for precise timing in high-energy physics and medical diagnostics. Fundamentally constrained by the trade-off between emission rate and light yield, conventional scintillators remain kinetically trapped in the sub-nanosecond regime, failing to break 50-picosecond limit. Here, we demonstrate a strategy to bypass this limitation by harnessing the coherent radiative acceleration in weakly confined CsPbCl3 perovskite nanocrystals to generate an ultrafast photon burst. This effect originates from the giant oscillator strength, which we unlock by suppressing exciton-phonon scattering at mild cryogenic temperatures. Consequently, our scintillator achieves an unprecedented dominant lifetime of 13.11 ps alongside a high light yield of 21,851 ph/MeV. The resulting prompt photon emission rate more than 100 times higher than that of state-of-the-art ultrafast scintillators. We validate this breakthrough in realistic detection scenarios, achieving a coincidence time resolution of 30.8 ps and accurately resolving 13.5 ps electron bunches and 16.6 ps single-shot gamma-ray pulses. Our findings establish a robust coherent framework for next-generation ultrafast scintillators, pushing extreme radiation diagnostics into the picosecond frontier.
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