1. Taking a snapshot of the triplet excited state of an OLED organometallic luminophore using X-rays
- Author
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Matteo Levantino, Andrea Cannizzo, R. Bohinc, Michela Gazzetto, Daniel James, Jakub Szlachetko, Camila Bacellar, Alexander A. Guda, Sergey Yu. Ketkov, Kristoffer Haldrup, Martin Beck, Mathias Sander, Marian Olaru, Georgios Pamfilidis, Jens Beckmann, Claudio Cirelli, Victoria Kabanova, Elena Rychagova, Nicolo Azzaroli, Victor V. Shapovalov, Samuel Menzi, Joanna Czapla-Masztafiak, Andrei A. Tereshchenko, Giulia F. Mancini, Aldo Mozzanica, Christopher J. Milne, Wojciech M. Kwiatek, Grigory Smolentsev, Matthias Vogt, Gregor Knopp, and Dardan Gashi
- Subjects
basis-sets ,absorption spectroscopy ,Materials science ,electronic-structure ,Photochemistry ,530 Physics ,Science ,activated delayed fluorescence ,General Physics and Astronomy ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Article ,General Biochemistry, Genetics and Molecular Biology ,law.invention ,chemistry.chemical_compound ,law ,540 Chemistry ,OLED ,lcsh:Science ,Structural rigidity ,Multidisciplinary ,Scattering ,light-emitting-diodes ,solvation dynamics ,Excited states ,transition ,General Chemistry ,021001 nanoscience & nanotechnology ,Laser ,620 Engineering ,Fluorescence ,emission spectroscopy ,0104 chemical sciences ,chemistry ,Chemical physics ,Excited state ,Luminophore ,systems ,lcsh:Q ,0210 nano-technology ,Excitation ,metal-complexes - Abstract
OLED technology beyond small or expensive devices requires light-emitters, luminophores, based on earth-abundant elements. Understanding and experimental verification of charge transfer in luminophores are needed for this development. An organometallic multicore Cu complex comprising Cu–C and Cu–P bonds represents an underexplored type of luminophore. To investigate the charge transfer and structural rearrangements in this material, we apply complementary pump-probe X-ray techniques: absorption, emission, and scattering including pump-probe measurements at the X-ray free-electron laser SwissFEL. We find that the excitation leads to charge movement from C- and P- coordinated Cu sites and from the phosphorus atoms to phenyl rings; the Cu core slightly rearranges with 0.05 Å increase of the shortest Cu–Cu distance. The use of a Cu cluster bonded to the ligands through C and P atoms is an efficient way to keep structural rigidity of luminophores. Obtained data can be used to verify computational methods for the development of luminophores., Nature Communications, 11 (1), ISSN:2041-1723
- Published
- 2020
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