Synthesis and X-ray imaging application of lanthanide-organic complex-based scintillators
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 suc-cessfully 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 scintil-lators 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.CCDC:2294866,1;2294867,2;2294869,3;2294868,4.
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