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

Smolentsev, Grigory; Milne, Christopher J.; Guda, Alexander; Haldrup, Kristoffer; Szlachetko, Jakub; Azzaroli, Nicolo; Cirelli, Claudio; Knopp, Gregor; Bohinc, Rok; Menzi, Samuel; Pamfilidis, Georgios; Gashi, Dardan; Beck, Martin; Mozzanica, Aldo; James, Daniel; Bacellar, Camila; Mancini, Giulia F.; Tereshchenko, Andrei; Shapovalov, Victor; Kwiatek, Wojciech M.; ... (2020). Taking a snapshot of the triplet excited state of an OLED organometallic luminophore using X-rays. Nature Communications, 11(1) 10.1038/s41467-020-15998-z

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > NCCR MUST
08 Faculty of Science > Institute of Applied Physics > Lasers

UniBE Contributor:

Cannizzo, Andrea and Gazzetto, Michela

Subjects:

600 Technology > 620 Engineering
500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

2041-1723

Language:

English

Submitter:

Andrea Cannizzo

Date Deposited:

10 Mar 2021 15:33

Last Modified:

12 Mar 2021 06:51

Publisher DOI:

10.1038/s41467-020-15998-z

BORIS DOI:

10.48350/152804

URI:

https://boris.unibe.ch/id/eprint/152804

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