Taking a snapshot of the triplet excited state of an OLED organometallic luminophore using X-rays

Grigory Smolentsev*, Christopher J. Milne, Alexander Guda, Kristoffer Haldrup, Jakub Szlachetko, Nicolo Azzaroli, Claudio Cirelli, Gregor Knopp, Rok Bohinc, Samuel Menzi, Georgios Pamfilidis, Dardan Gashi, Martin Beck, Aldo Mozzanica, Daniel James, Camila Bacellar, Giulia F. Mancini, Andrei Tereshchenko, Victor Shapovalov, Wojciech M. KwiatekJoanna Czapla-Masztafiak, Andrea Cannizzo, Michela Gazzetto, Mathias Sander, Matteo Levantino, Victoria Kabanova, Elena Rychagova, Sergey Ketkov, Marian Olaru, Jens Beckmann, Matthias Vogt*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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.
Original languageEnglish
Article number2131
JournalNature Communications
Volume11
Issue number1
Number of pages9
ISSN2041-1723
DOIs
Publication statusPublished - 2020

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