Illuminations for constructions of scintillating lanthanide-organic complexes in sensitive X-ray detection and high-resolution radiative imaging

X-ray detection and imaging via scintillators has been utilized in missions worldwide within areas of scientific research, medical industry, military defense and homeland security. Commercial scintillators are costly with high energy consumption through the sintering. It is of great significance to seek alternative scintillating materials for sensitive X-ray detection in the next-generation. Herein, eight structure-defined Ln(III)-based metal-organic frameworks (Ln-MOFs) were prepared, 2D [Ln(2)(1,4-ndc)(3)(DMF)(4)]n center dot nH(2)O (Ln = Sm 1, Eu 2, Dy 3, Tb 4) and 3D [Ln(4)(2,6-ndc)(6)(mu(2)-H2O)(2)(H2O)(4)]n center dot 2nH(2)O (Ln = Sm 5, Eu 6, Dy 7, Tb 8), where 1,4-H(2)ndc = 1,4-naphthalene dicarboxylate acid, 2,6-H(2)ndc = 2,6-napthalene dicarboxylate acid, DMF = N,N-dimethylformamide. Merely compounds 2 and 6 show remarkable X-ray scintillation performance via the characteristic red emissions of Eu(III) ions, in which the absorbed energy from the triplet states of the organic moieties can be transferred more efficiently to the resonance emission levels of Eu(III) ions than other lanthanide(III) ions. The X-ray dosage rate detection limits of 2 and 6 are superior to the standard for the medical X-ray diagnosis dosage rate. As proofs-of-concepts, matrix-mixed membranes fabricated with 2 and 6 have achieved remarkable X-ray imaging with high resolution for practical object shooting. (c) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

Eight structure-defined Ln(III)-based metal-organic frameworks (Ln-MOFs) were prepared and evaluated as scintillating materials. Compounds 2 and 6 exhibited remarkable X-ray scintillation performance and could be used for high-resolution X-ray imaging. These materials hold potential as sensitive X-ray detection materials for the next generation.