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Efficient and Reabsorption-Free Radioluminescence in Cs3Cu2I5 Nanocrystals with Self-Trapped Excitons.
Advanced Science ( IF 14.3 ) Pub Date : 2020-04-16 , DOI: 10.1002/advs.202000195 Linyuan Lian 1 , Moyan Zheng 1 , Weizhuo Zhang 1 , Lixiao Yin 2 , Xinyuan Du 2 , Peng Zhang 3 , Xiuwen Zhang 3 , Jianbo Gao 4 , Daoli Zhang 1 , Liang Gao 2 , Guangda Niu 2 , Haisheng Song 2 , Rong Chen 5 , Xinzheng Lan 1 , Jiang Tang 2 , Jianbing Zhang 1, 2, 6
Advanced Science ( IF 14.3 ) Pub Date : 2020-04-16 , DOI: 10.1002/advs.202000195 Linyuan Lian 1 , Moyan Zheng 1 , Weizhuo Zhang 1 , Lixiao Yin 2 , Xinyuan Du 2 , Peng Zhang 3 , Xiuwen Zhang 3 , Jianbo Gao 4 , Daoli Zhang 1 , Liang Gao 2 , Guangda Niu 2 , Haisheng Song 2 , Rong Chen 5 , Xinzheng Lan 1 , Jiang Tang 2 , Jianbing Zhang 1, 2, 6
Affiliation
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Radioluminescent materials (scintillators) are widely applied in medical imaging, nondestructive testing, security inspection, nuclear and radiation industries, and scientific research. Recently, all‐inorganic lead halide perovskite nanocrystal (NC) scintillators have attracted great attention due to their facile solution processability and ultrasensitive X‐ray detection, which allows for large area and flexible X‐ray imaging. However, the light yield of these perovskite NCs is relatively low because of the strong self‐absorption that reduces the light out‐coupling efficiency. Here, NCs with self‐trapped excitons emission are demonstrated to be sensitive, reabsorption‐free scintillators. Highly luminescent and stable Cs3Cu2I5 NCs with a photoluminescence quantum yields of 73.7%, which is a new record for blue emission lead‐free perovskite or perovskite‐like NCs, is produced with the assistance of InI3. The PL peak of the Cs3Cu2I5 NCs locates at 445 nm that matches with the response peak of a silicon photomultiplier. Thus, Cs3Cu2I5 NCs are demonstrated as efficient scintillators with zero self‐absorption and extremely high light yield (≈79 279 photons per MeV). Both Cs3Cu2I5 NC colloidal solution and film exhibit strong radioluminescence under X‐ray irradiation. The potential application of Cs3Cu2I5 NCs as reabsorption‐free, low cost, large area, and flexible scintillators is demonstrated by a prototype X‐ray imaging with a high spatial resolution.
中文翻译：
具有自俘获激子的 Cs3Cu2I5 纳米晶体中的高效且无重吸收的放射发光。
辐射发光材料（闪烁体）广泛应用于医学成像、无损检测、安全检测、核与辐射工业、科学研究等领域。最近，全无机卤化铅钙钛矿纳米晶体（NC）闪烁体因其易于溶液加工和超灵敏的X射线检测而引起了极大的关注，可实现大面积和灵活的X射线成像。然而，这些钙钛矿NCs的光产率相对较低，因为强自吸收降低了光输出耦合效率。在这里，具有自俘获激子发射的NC被证明是敏感的、无重吸收的闪烁体。在InI 3的辅助下制备出高发光且稳定的Cs 3 Cu 2 I 5 NCs，其光致发光量子产率为73.7%，这是蓝光发射无铅钙钛矿或类钙钛矿NCs的新纪录。Cs 3 Cu 2 I 5 NC 的 PL 峰值位于 445 nm，与硅光电倍增管的响应峰值匹配。因此，Cs 3 Cu 2 I 5 NCs被证明是一种高效的闪烁体，具有零自吸收和极高的光产量（约79 279光子/MeV）。Cs 3 Cu 2 I 5 NC胶体溶液和薄膜在X射线照射下均表现出强辐射发光。具有高空间分辨率的原型 X 射线成像证明了 Cs 3 Cu 2 I 5 NC 作为无重吸收、低成本、大面积和柔性闪烁体的潜在应用。
更新日期：2020-04-16
中文翻译：
具有自俘获激子的 Cs3Cu2I5 纳米晶体中的高效且无重吸收的放射发光。
辐射发光材料（闪烁体）广泛应用于医学成像、无损检测、安全检测、核与辐射工业、科学研究等领域。最近，全无机卤化铅钙钛矿纳米晶体（NC）闪烁体因其易于溶液加工和超灵敏的X射线检测而引起了极大的关注，可实现大面积和灵活的X射线成像。然而，这些钙钛矿NCs的光产率相对较低，因为强自吸收降低了光输出耦合效率。在这里，具有自俘获激子发射的NC被证明是敏感的、无重吸收的闪烁体。在InI 3的辅助下制备出高发光且稳定的Cs 3 Cu 2 I 5 NCs，其光致发光量子产率为73.7%，这是蓝光发射无铅钙钛矿或类钙钛矿NCs的新纪录。Cs 3 Cu 2 I 5 NC 的 PL 峰值位于 445 nm，与硅光电倍增管的响应峰值匹配。因此，Cs 3 Cu 2 I 5 NCs被证明是一种高效的闪烁体，具有零自吸收和极高的光产量（约79 279光子/MeV）。Cs 3 Cu 2 I 5 NC胶体溶液和薄膜在X射线照射下均表现出强辐射发光。具有高空间分辨率的原型 X 射线成像证明了 Cs 3 Cu 2 I 5 NC 作为无重吸收、低成本、大面积和柔性闪烁体的潜在应用。
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