Citation: Liang TANG, Jingfei NI, Kang XIAO, Xiangmei LIU. Synthesis and X-ray imaging application of lanthanide-organic complex-based scintillators[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(10): 1892-1902. doi: 10.11862/CJIC.20240139 shu

Synthesis and X-ray imaging application of lanthanide-organic complex-based scintillators

State Key Laboratory of Organic Electronics and Information Displays, School of Materials Science & Engineering, Nanjing University of Posts & Telecommunications, Nanjing 210023, China

Corresponding author: Xiangmei LIU, iamxmliu@njupt.edu.cn
Received Date: 22 April 2024
Revised Date: 1 July 2024

Figures(8)

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.
- lanthanide(Ⅲ)-organic complexes,
- scintillators,
- X-ray imaging,
- multi-color X-ray excited luminescence
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