| 多色稀土有机配合物闪烁体的合成及X射线成像应用 | |
| Synthesis and X-ray imaging application of lanthanide-organic complex-based scintillators | |
| 摘要: 以2，5-二氟苯甲酸(HDFBA)为第一配体，2，2'∶6'，2″-三联吡啶(terpy)、1,10-菲咯啉(phen)为第二配体，成功合成4种稀土有机配合物闪烁体：[Tb(DFBA)3(terpy)(H2O)] (1)、[Eu(DFBA)3(terpy)(H2O)] (2)、[Tb(DFBA)3(phen)] (3)、[Eu(DFBA)3(phen)] (4)。这些稀土有机配合物闪烁体展现出优异的X射线剂量响应性、光稳定性以及高达(25 100±2 000) photons·MeV-1的稳态X射线激发的相对光产额。通过调节配合物中Eu3+和Tb3+的物质的量之比，实现了从绿色到红色的多色发光。将它们以一定的比例掺入聚乙烯醇(PVA)基质中获得均匀闪烁体薄膜，实现了高分辨(11.2 lp·mm-1) X射线成像。 | |
| 关键词: 稀土有机配合物 闪烁体 X射线成像 多色X射线激发发光 | |
| 基金项目: 国家自然科学基金(No.62275129)和南京邮电大学校级科研基金(No.NY223120)资助。 | |
| Abstract: Lanthanide-organic complex scintillators, known for their structural flexibility and optical tunability, have shown great promise as X-ray scintillators. Herein, four lanthanide-organic complex scintillators, named [Tb (DFBA)3(terpy)(H2O)] (1), [Eu(DFBA)3(terpy)(H2O)] (2), [Tb(DFBA)3(phen)] (3), and [Eu(DFBA)3(phen)] (4), were successfully synthesized by solvent volatilization using 2,5-difluoro benzoic acid (HDFBA) as the first ligand, 2,2'∶6',2″-terpy (terpy) and 1,10-phenanthroline (phen) as the second ligands. The incorporation of phen in these complexes enhanced their molecular structural rigidity and coordination field stability, reduced non-radiative transitions, and resulted in excellent luminescent properties. The fluorine-substituted organic ligands minimized non-radiative O—H vibrations, thereby improving luminescence efficiency. As a result, the lanthanide-organic complex-based scintillators exhibited high radiation responsiveness and excellent X-ray absorption capability, and achieved a high steady-state X-ray excited relative light yield of (25 100±2 000) photons·MeV-1. Additionally, scintillators with multi-color luminescence ranging from green to red were fabricated by manipulating the molar ratio of Eu3+ to Tb3+ ions. Finally, when incorporated into a polyvinyl alcohol (PVA) matrix, a uniform, flexible scintillator film with high-resolution X-ray imaging (11.2 lp·mm-1) was obtained. These findings demonstrate that the introduction of a second ligand and appropriate hydrophobic groups (such as fluorine substitution) hold significant potential for designing high-performance lanthanide-organic complex scintillators for high-resolution X-ray imaging. | |
| Keywords: lanthanide（Ⅲ）-organic complexes scintillators X-ray imaging multi-color X-ray excited luminescence | |
| 投稿时间：2024-04-22 修订日期：2024-07-01 | |
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| 唐亮,倪京飞,肖康,刘湘梅.多色稀土有机配合物闪烁体的合成及X射线成像应用[J].无机化学学报,2024,40(10):1892-1902. | |
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