Key Takeaways & Executive Findings
- •• AIE materials exhibit high quantum efficiency and rapid response, significantly improving radiation detection sensitivity and reducing background noise. • The review covers recent progress in AIE scintillators for X-ray, γ-ray, and fast neutron detection, showcasing their versatility across radiation types. • AIE scintillators enable high-resolution imaging, offering a promising alternative to traditional inorganic and organic scintillators. • Key challenges include long-term stability, device integration, and adaptability to diverse radiation forms, which must be addressed for broader applications.
Abstract
Aggregation-induced emission (AIE) is a unique phenomenon where certain organic materials exhibit enhanced luminescence in their aggregated states, overcoming the typical quenching observed in conventional organic materials. Since its discovery in 2001, AIE has driven significant advances in fields like OLEDs and biological imaging, earning recognition in fundamental research. However, its application in high-energy radiation detection remains underexplored. Organic scintillators, though widely used, face challenges such as low light yield and poor radiation attenuation. AIE materials offer promising solutions by improving light yield, response speed, and radiation attenuation. This review summarizes the design strategies behind AIE scintillators and their very recent applications in X-ray, γ-ray, and fast neutron detection. We highlight their advantages in enhancing detection sensitivity, reducing background noise, and achieving high-resolution imaging. By addressing the current challenges, we believe AIE materials will play a pivotal role in advancing future radiation detection and imaging technologies.
1. Introduction
Radiation detection and imaging technologies are widely utilized in fields such as medical diagnostics, high-energy physics, non-destructive testing, and security surveillance. Central to these technologies are radiation detectors, which convert radiation into measurable signals. Scintillator-based radiation detection is the most widely used approach today, owing to the fast response speed, ease of fabrication, integration capability, and low cost of scintillators. Scintillation is the process by which ionizing radiation interacts with scintillator materials to produce photons. The ongoing goal in this field is to develop scintillators with higher efficiency and faster timing properties. Higher efficiency allows for the generation of more photons from a given radiation dose, improving image quality without increasing patient exposure. Fast scintillation not only enables quicker imaging with less lag, but also plays a crucial role in applications such as computed tomography (CT), positron emission tomography (PET), and high-energy physics experiments.
The development of radiation detection scintillators dates back to the late nineteenth century, with early advancements such as calcium tungstate (CaWO4) and zinc sulfide (ZnS)-based powders that efficiently convert X-rays into visible light. Since then, various inorganic single crystals and powders have been developed, many of which exhibit outstanding performance and are now widely used. While inorganic scintillators are known for their high light yield and effectiveness in detecting high-energy radiation, they still face several challenges. For example, common scintillators like NaI and CsI are prone to instability due to their hygroscopic nature. Achieving both high sensitivity and temporal resolution is also difficult. Scintillators like BaF2 offer high temporal resolution but suffer from low exciton utilization, reducing X-ray sensitivity. Meanwhile, rare-earth-based scintillators like SrI2 have high exciton utilization but slow d→f transitions, limiting their temporal resolution. Additionally, doped ion-based scintillators, such as CsI, often experience lattice defects, leading to prolonged afterglow and reduced temporal resolution. Overcoming these challenges is essential to enhancing scintillator performance for radiation detection.
In recent years, organic scintillators have gained significant attention due to their advantages, including low-cost raw materials, ease of modification and processing, and the potential for large-area fabrication, making them highly promising for applications in radiation detection and imaging. However, traditional planar-structured organic scintillators often suffer from reduced emission intensity caused by π-π stacking interactions in the solid and aggregated states, which negatively impact their radiation detection performance. The discovery of aggregation-induced emission (AIE) offers a new avenue to overcome these limitations, as AIE materials exhibit enhanced emission in aggregated states, making them ideal candidates for high-performance scintillators.
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Xinyi Li, Jiafu Yu, Yinghao Fan, Yuting Gao, Guangda Niu (2025). Aggregation-Induced Emissive Scintillators: A New Frontier for Radiation Detection and Imaging. Nano-Micro Letters. https://doi.org/10.1007/s40820-025-01671-x
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Frequently Asked Questions
What are aggregation-induced emission (AIE) scintillators?
AIE scintillators are organic materials that exhibit enhanced luminescence in their aggregated states, overcoming the quenching effect seen in conventional organic scintillators. They are used for radiation detection and imaging, offering high light yield, fast response, and improved radiation attenuation.
How do AIE scintillators improve radiation detection?
AIE scintillators improve radiation detection by providing higher quantum efficiency, faster response times, and better radiation attenuation compared to traditional organic scintillators. This leads to enhanced sensitivity, reduced background noise, and higher-resolution imaging.
What types of radiation can AIE scintillators detect?
AIE scintillators have been demonstrated for detecting X-rays, gamma rays, and fast neutrons, making them versatile for various applications in medical imaging, security screening, and high-energy physics.
What are the main challenges for AIE scintillators?
Key challenges include ensuring long-term stability, integrating into practical devices, and adapting to diverse radiation forms. Addressing these issues is crucial for broader adoption in real-world applications.
What is the significance of AIE scintillators in medical imaging?
AIE scintillators can enhance image quality while potentially reducing patient exposure by generating more photons per radiation dose. Their fast response also enables quicker imaging with less lag, beneficial for CT and PET scans.
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