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A new mode of luminescence in lanthanide oxalates metal–organic frameworks

Alzard Department of Chemistry, UAE University, P.O. Box 15551, Al-Ain, United Arab Emirates|
Ahmed (55173424000) | P.K. (57224921548); Alzamly | K. (6603625121); Sreejith | Viet Q. (55602465800); Sethupathi | Thi H. (57955113300); Bui Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India| Quynh Anh T. (57220935026); Ho Advanced Institute of Science and Technology, The University of Danang, 41 Le Duan, Danang, Viet Nam| Ha L. (56818296400); Nguyen Joint UAEU–UC Berkeley Laboratories for Materials Innovations, United Arab Emirates University, 15551, Al-Ain, United Arab Emirates| Na’il (57670964700); Nguyen Berkeley Global Science Institute, Berkeley, 94720, CA, United States| Lamia A. (57322670400); Saleh Kavli Energy Nanoscience Institute at UC Berkeley, Berkeley, 94720, CA, United States| Reem H. (57205403455); Siddig Department of Chemistry, University of California Berkeley, Berkeley, 94720, CA, United States|

Scientific Reports Số 1, năm 2022 (Tập 12, trang -)

ISSN: 20452322

ISSN: 20452322

DOI:

Tài liệu thuộc danh mục:

Article

English

Tóm tắt tiếng anh
Two lanthanide metal–organic frameworks [Ln-MOFs, Ln = Eu(III), Tb(III)] composed of oxalic acid and Ln building units were hydrothermally synthesized and fully characterized by powder X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscope, and energy-dispersive X-ray spectroscopy. Furthermore, their magnetic susceptibility measurements were obtained using SQUID based vibrating sample magnetometer (MPMS 3, Quantum Design). Both Ln-MOFs exhibited highly efficient luminescent property. Solid-state photoluminescence (PL) measurements revealed phosphorescence emission bands of Eu-MOF and Tb-MOF centered at 618 nm (red emission) and 550 nm (green emission) upon excitation at 396 nm and 285 nm, respectively. Eu-MOF and Tb-MOF displayed a phosphorescence quantum yield of 53% and 40%, respectively. Time-resolved PL analyses showed very long lifetime values, at 600 and 1065 ± 1 µs for Eu-MOF and Tb-MOF, respectively. Calculations performed by density functional theory indicated a charge transfer form metal centres to the ligand which was in good agreement with the experimental studies. Therefore, this new mode of highly photoluminescent MOF materials is studied for the first time which paves the way for better understanding of these systems for potential applications. © 2022, The Author(s).

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