当前位置:首页>南京>南京邮电大学黄维士、李巍、陶冶《‌Chemistry of Materials》|多共振热激活延迟荧光共聚物闪烁体用于高效X射线成像

南京邮电大学黄维士、李巍、陶冶《‌Chemistry of Materials》|多共振热激活延迟荧光共聚物闪烁体用于高效X射线成像

  • 2026-04-16 03:37:10
南京邮电大学黄维士、李巍、陶冶《‌Chemistry of Materials》|多共振热激活延迟荧光共聚物闪烁体用于高效X射线成像
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当前亟需高效、柔韧且可溶液加工的有机聚合物闪烁体以满足多样化应用需求。然而传统有机闪烁体在激子利用率和X射线吸收能力方面存在固有局限。本研究通过简便的自由基共聚反应,将多共振热激活延迟荧光发射体共价整合至溴功能化共聚物基质中,提出了一种高性能聚合物闪烁体的设计策略。由于溴元素的引入,所得共聚物闪烁体通过高效的反向系间穿越实现了激子利用率提升,并显著增强了X射线吸收性能。优化材料在500 nm处呈现峰值辐射发光,半高全宽仅为46 nm。标准线对测试图案测定显示,该闪烁体具有10 lp/mm的高空间分辨率及301 nGy/s的极低检测限。实际X射线成像应用证实其能清晰可视化复杂内部结构,验证了其在临床与工业领域的应用潜力。本研究为先进有机闪烁体的开发建立了通用分子设计策略。

图1. 多共振热激活延迟荧光(Mr- TADF)共聚物闪烁体示意图。(a) 通过将Mr- TADF 发色团客体整合到X射线敏化主体中,构建Mr- TADF 共聚物闪烁体的设计策略。(b) 硅光电倍增管(SiPMT)探测器的量子效率及典型Mr- TADF 闪烁体的发射特性。(c) BrPSQAx分子结构(左)及X射线诱导闪烁过程中的辐射发光(RL)与能量转移(ET)机制(右)。在X射线激发下,重溴(Br)原子主要吸收高能光子,产生大量高能初级电子。经热化处理后,电子-空穴对在主体BrPS中有效复合,形成单重态与三重态激子态,统计比为1:3。激发能量从BrPS传递至 VQA 客体,最终产生以Mr- TADF 为主的辐射发光。

图2. 常温条件下Mr- TADF 共聚物闪烁体的闪烁特性。(a) BrPSQA、BrPS及 VQA 的模拟X射线吸收光谱。(b) BrPSQAx(x=1−4)的相对发光光谱。(c,d) 不同辐射剂量率下BrPSQA3的相对发光光谱(c)与光强(d)。检测限(LOD)采用 3σ /斜率法计算。(e) 未经校正的硅光电倍增管光谱响应曲线与BrPSQA3的相对发光光谱。(f) 相同激发条件下萘(NA)、蒽(AN)、2,3,5,6-四 (3,6-di-tbutylcarbazol-9-yl)-1,4-dicyanobenzene(4CzTPN-Bu)、1,2,3,5-四(咔唑-9-基)-4,6-二氰基苯、2,4,5,6-四(9H-咔唑-9-基)异酞腈(4CzIPN)及BrPSQA3粉末的X射线诱导光产额对比计算结果。(g) 在210.2 mGy/s剂量率下,连续X射线辐照4000秒及267次开关辐照循环后,500 nm波长处相对发光强度稳定性。

图3. Mr- TADF 共聚物的光物理性质与理论计算结果。(a) 归一化 SSPL 光谱(上图)与RL光谱(下图)。(b) 330 nm紫外光激发下的光致发光量子产率。(c) 延迟荧光寿命分布曲线。(d) BrPSQA3在78至298 K温度范围内的温度依赖性 SSPL 光谱。(e) PBrPS的 SSPL 光谱与BrPSQA3的吸光度光谱。(f) PBrPS在77 K温度下的 SSPL 光谱及延迟荧光(延迟时间10 ms)光谱。(g) BrPSQA的最高占据分子轨道(HOMO)与最低未占分子轨道(LUMO)分布,以及对应能级与自旋轨道常数(SOCs)。PF:瞬时荧光;DF:延迟荧光;IC:相互转化;NR:非辐射衰变。(h) X射线激发下可能的RL发光机制。需注意非辐射过程被省略以清晰展示RL发光特性。

图4. X射线成像应用示意图。(a) BrPSQA3掺杂聚砜闪烁体薄膜的制备流程。(b) 自行设计的X射线成像系统示意图。(c) 日光与紫外光照下制备的闪烁体薄膜显微照片。(d) BrPSQA3掺杂聚砜薄膜的反射光谱(RL)分析结果。(e) 闪烁屏X射线图像对应的调制传递函数(MTF)曲线。(f) 标准X射线测试图案板、封装金属螺丝、鱼体内注射器针头及电子芯片的明场与X射线图像对比。比例尺为0.5厘米。

期刊:Chemistry of Materials
题目:Multiresonance Thermally Activated Delayed Fluorescence Copolymer Scintillators for Efficient X‑ray Imaging
作者:Huanhuan Li, Shuai Huang, Jianwei Li, Yitong Liu, Shuman Zhang, Hengyu Cao, Zhisheng Gao, Xin Yan, Siming Chen, Peng Zhang, Ye Tao,* Gaozhan Xie, Yun Ma, Ting Wang, Wei Li,* Runfeng Chen, and Wei Huang*
接受日期:First published: 06 April 2026
原文链接:https://doi.org/10.1021/acs.chemmater.5c02989
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  1. CONNECT:[ UseTime:0.000588s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000878s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000346s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000580s ]
  8. SELECT * FROM `article` WHERE `id` = 529947 LIMIT 1 [ RunTime:0.000494s ]
  9. UPDATE `article` SET `lasttime` = 1776775534 WHERE `id` = 529947 [ RunTime:0.001083s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000296s ]
  11. SELECT * FROM `article` WHERE `id` < 529947 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000431s ]
  12. SELECT * FROM `article` WHERE `id` > 529947 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000512s ]
  13. SELECT * FROM `article` WHERE `id` < 529947 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000516s ]
  14. SELECT * FROM `article` WHERE `id` < 529947 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001092s ]
  15. SELECT * FROM `article` WHERE `id` < 529947 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000717s ]
0.079176s