Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence

Pander, Piotr; Turnbull, Graeme; Zaytsev, Andrey V.; Dias, Fernando B.; Kozhevnikov, Valery N.

Abstract

This work describes an application of 1,2,4-triazine methodology for the synthesis of novel cyclometallated Pt (II) complexes of C^N type. It is shown that addition of a cyclopenteno unit into the complex structure not only facilitates the fabrication of efficient solution-processed OLED devices (EQEmax = 10.7%), but also imposes structural changes leading to even more soluble derivatives. Finally, it was shown that by varying the number of fused benzene rings in the C^N ligand it is possible to tune the emission from green-blueish (ΦPL = 0.15–0.43) to yellow-orange (ΦPL = 0.25). 1,2,4-Triazine methodology gives unique opportunity to fuse additional benzene ring into the pyridine ring and provided the ligand L5 that contained previously unexplored large aromatic system. It was shown that such benzannulation is an effective way to achieve redshift in emission and give rise to solution-processable, single dopant OLED device showing emission spectrum resembling candle light.

Citation

Pander, P., Turnbull, G., Zaytsev, A. V., Dias, F. B., & Kozhevnikov, V. N. (2021). Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence. Dyes and Pigments, 184, Article 108857. https://doi.org/10.1016/j.dyepig.2020.108857

• Journal Article Type: Article
• Acceptance Date: Sep 11, 2020
• Online Publication Date: Sep 14, 2020
• Publication Date: 2021-01
• Deposit Date: Oct 7, 2020
• Publicly Available Date: Oct 7, 2020
• Journal: Dyes and Pigments
• Print ISSN: 0143-7208
• Electronic ISSN: 1873-3743
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 184
• Article Number: 108857
• DOI: https://doi.org/10.1016/j.dyepig.2020.108857
• Public URL: https://durham-repository.worktribe.com/output/1290748