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Near-Infrared Electroluminescence beyond 940 nm in Pt(N^C^N)X Complexes: Influencing Aggregation with the Ancillary Ligand X [dataset] Open Access

We present a study of aggregate excited states formed by complexes of the type Pt(N^C^N)X, where N^C^N represents a tridentate cyclometallating ligand, and X = SCN or I. These materials display near-infrared (NIR) photoluminescence in film and electroluminescence in NIR OLEDs with λELmax = 720-944 nm. We demonstrate that the use of X = SCN or I modulates aggregate formation compared to the parent complexes where X = Cl. While the identity of the monodentate ligand affects the energy of Pt–Pt excimers in solution in only a subtle way, it strongly influences aggregation in film. Detailed calculations on aggregates of different sizes support the experimental conclusions from steady-state and time-resolved luminescence studies at variable temperatures. The use of X = I appears to limit aggregation to the formation of dimers, while X = SCN promotes the formation of larger aggregates, such as tetramers and pentamers, leading in turn to NIR photo- and electroluminescence > 850 nm. A possible explanation for the contrasting influence of the monodentate ligands is the lesser steric hindrance associated with the SCN group compared to the bulkier I ligand. By exploiting the propensity of the SCN complexes to form extended aggregates, we have prepared an NIR-emitting OLED that shows very long wavelength electroluminescence, with λELmax = 944 nm and a maximum EQE = 0.3 ± 0.1 %. Such data appear to be unprecedented for a device relying on a Pt(II) complex aggregate as the emitter.

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Dataset

Contributors

Creator: Pander, Piotr ^1,2
Contact person: Pander, Piotr ^1,2
Salthouse, Rebecca J. ³
Yufit, Dmitry S. ³
Dias, Fernando B. ²
Williams, J.A. Gareth ³

¹ Faculty of Chemistry, Silesian University of Technology
² Department of Physics, Durham University
³ Department of Chemistry, Durham University

Funder

EPSRC, grant ref. EP/S012788/1

Research methods

Other description

Keyword

Excimer
Platinum complex
Near infrared
Photophysics
OLED
Aggregation

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Identifier

ark:/32150/r202870v95d
doi:10.15128/r202870v95d

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

P.H. Pander

Date Uploaded

8 November 2022, 23:11:15

Date Modified

9 November 2022, 14:11:37

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File format: zip (ZIP Format)

Mime type: application/zip

File size: 943620

Last modified: 2022:11:08 23:58:22+00:00

Filename: Dataset.zip

Original checksum: dc398cb72d0a18536414b1c769d41714