@article{e9ddb3516e59453c910d4b1d7d5b3521,
title = "Triplet-triplet energy-transfer-based transparent X-ray imaging scintillators",
abstract = "In this work, we fabricated a highly efficient and reabsorption-free transparent X-ray imaging scintillator with high performance using an efficient triplet-triplet energy transfer strategy between thermally activated delayed fluorophore (TADF-Br) and iridium organometallic complex (Ir-OMC). Steady-state and ultrafast time-resolved experiments—supported by high-level density functional theory calculations—clearly demonstrate that efficient triplet-triplet energy transfer from TADF-Br with a high X-ray absorption cross-section to emissive Ir-OMC can be achieved. Such high efficiency of interfacial triplet energy transfer and the heavy atoms in both the donor and acceptor led to a remarkable enhancement in triplet-state radioluminescence upon X-ray irradiation. The fabricated X-ray imaging scintillator achieved an X-ray imaging resolution of 19.8 lp mm−1, exceeding the resolution of most reported organic and organometallic scintillation screens.",
keywords = "high-resolution X-ray imaging scintillators, MAP5: Improvement, organometallic, thermally activated delayed fluorescence, triplet-triplet energy transfer, ultrafast time-resolved spectroscopy",
author = "Wang, {Jian Xin} and Indranil Dutta and Jun Yin and Tengyue He and Luis Guti{\'e}rrez-Arzaluz and Bakr, {Osman M.} and Mohamed Eddaoudi and Huang, {Kuo Wei} and Mohammed, {Omar F.}",
note = "Funding Information: This work was supported by the King Abdullah University of Science and Technology (KAUST). Funding Information: This work was supported by the King Abdullah University of Science and Technology (KAUST). J.X.W. and O.F.M. conceived the idea. J.X.W. synthesized the TADF-Br chromophore, prepared the composite films, performed the steady and time-resolved measurements, and analyzed the data. I.D. synthesized Ir-OMC. J.X.W. performed and analyzed the scintillation measurements. J.Y. performed the DFT calculations. T.H. contributed to the scintillation measurements. L.G.A. performed the TCSPC and ns-TA measurements. O.M.B. M.E. and K.W.H. contributed to the discussion of the experimental data and provided valuable suggestions. O.F.M. supervised the entire project, suggested the analysis, and interpreted the experimental data. J.X.W. and O.F.M. co-wrote the manuscript. We have a pending patent related to this work, and the authors declare the following competing financial interest: O.M.B. is a founder of Quantum Solutions, a company that develops optoelectronic devices. Publisher Copyright: {\textcopyright} 2022 Elsevier Inc.",
year = "2023",
month = jan,
day = "4",
doi = "10.1016/j.matt.2022.09.031",
language = "English",
volume = "6",
pages = "217--225",
journal = "Matter",
issn = "2590-2393",
publisher = "Royal Society of Chemistry",
number = "1",
}