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Kesarkar S, Mróz W, Penconi M, et al. Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations. Angew Chem Int Ed Engl. 2016;55(8):2714-8doi: 10.1002/anie.201509798.
Kesarkar, S., Mróz, W., Penconi, M., Pasini, M., Destri, S., Cazzaniga, M., Ceresoli, D., Mussini, P. R., Baldoli, C., Giovanella, U., & Bossi, A. (2016). Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations. Angewandte Chemie (International ed. in English), 55(8), 2714-8. https://doi.org/10.1002/anie.201509798
Kesarkar, Sagar, et al. "Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations." Angewandte Chemie (International ed. in English) vol. 55,8 (2016): 2714-8. doi: https://doi.org/10.1002/anie.201509798
Kesarkar S, Mróz W, Penconi M, Pasini M, Destri S, Cazzaniga M, Ceresoli D, Mussini PR, Baldoli C, Giovanella U, Bossi A. Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations. Angew Chem Int Ed Engl. 2016 Feb 18;55(8):2714-8. doi: 10.1002/anie.201509798. Epub 2016 Jan 25. PMID: 26804423.
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Angew Chem Int Ed Engl. 2016 Feb 18;55(8):2714-8. doi: 10.1002/anie.201509798. Epub 2016 Jan 25.

Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations.

Angewandte Chemie (International ed. in English)

Sagar Kesarkar, Wojciech Mróz, Marta Penconi, Mariacecilia Pasini, Silvia Destri, Marco Cazzaniga, Davide Ceresoli, Patrizia R Mussini, Clara Baldoli, Umberto Giovanella, Alberto Bossi

Affiliations

  1. Istituto di Scienze e Tecnologie Molecolari-, CNR and SmartMatLab Center, Via C. Golgi 19, 20133, Milano, Italy.
  2. Istituto per lo Studio delle Macromolecole-, CNR, Via E. Bassini 15, 20133, Milano, Italy.
  3. Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milano, Italy.
  4. Istituto per lo Studio delle Macromolecole-, CNR, Via E. Bassini 15, 20133, Milano, Italy. [email protected].
  5. Istituto di Scienze e Tecnologie Molecolari-, CNR and SmartMatLab Center, Via C. Golgi 19, 20133, Milano, Italy. [email protected].

PMID: 26804423 DOI: 10.1002/anie.201509798

Abstract

Three NIR-emitting neutral Ir(III) complexes [Ir(iqbt)2 (dpm)] (1), [Ir(iqbt)2 (tta)] (2), and [Ir(iqbt)2 (dtdk)] (3) based on the 1-(benzo[b]thiophen-2-yl)-isoquinolinate (iqtb) were synthesized and characterized (dpm=2,2,6,6-tetramethyl-3,5-heptanedionate; tta=2-thienoyltrifluoroacetonate; dtdk=1,3-di(thiophen-2-yl)propane-1,3-dionate). The compounds emit between λ=680 and 850 nm with high luminescence quantum yields (up to 16 %). By combining electrochemistry, photophysical measurements, and computational modelling, the relationship between the structure, energy levels, and properties were investigated. NIR-emitting, solution-processed phosphorescent organic light-emitting devices (PHOLEDs) were fabricated using the complexes. The devices show remarkable external quantum efficiencies (above 3 % with 1) with negligible efficiency roll-off values, exceeding the highest reported values for solution-processible NIR emitters.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: density functional calculations; electrochemistry; iridium; organic light emitting diodes; phosphorescence

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