Molecular isomeric engineering of naphthyl-quinoline-containing dinuclear platinum complexes to tune emission from deep red to near infrared. Issue 3 (2nd January 2019)

• Record Type: Journal Article
• Authors: Xiong, Wenjing; Meng, Fanyuan; You, Caifa; Wang, Pu; Yu, Junting; Wu, Xiugang; Pei, Yong; Zhu, Weiguo; Wang, Yafei; Su, Shijian
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 3(2019)
• Page Start: 630
• Page End: 638
• Publication Date: 2019-01-02
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc05263h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A type of isomeric dinuclear platinum complex of (C^N)2 Pt2 (μ-C8 PhOXT)2 is synthesized with different C^N isomers of naphthyl-quinoline. These complexes exhibit tunable emission with different emissive efficiencies. Abstract : Four isomeric dinuclear platinum complexes of (C^N)2 Pt2 (μ-OXT)2 are synthesized and characterized with different C^N cyclometalating ligands and the same ancillary ligand of 5-(4-octylphenyl)-1, 3, 4-oxadiazole-2-thiol (μ-OXT). These isomeric C^N ligands are 1-naphthyl-1-isoquinoline (niq), 2-naphthyl-1-isoquinoline (2niq), 1-naphthyl-2-quinoline (nq) and 2-naphthyl-2-quinoline (2nq). The isomeric effect on the photophysical, electrochemical and electroluminescence properties of (C^N)2 Pt2 (μ-OXT)2 was systematically studied. It is found that the emissions were easy to tune from deep red to near infrared for (C^N)2 Pt2 (μ-OXT)2 by changing the C^N isomers. Furthermore, the complexes with 2-naphthyl presented better electroluminescence (EL) properties than the complexes with 1-naphthyl in these solution-processable polymeric light-emitting devices. In contrast to the(2nq)2 Pt2 (μ-OXT)2 -doped devices displaying a deep-red emission peaked at 686 nm with an external quantum efficiency (EQE) of 3.21%, the(2niq)2 Pt2 (μ-OXT)2 -doped devices exhibited a near-infrared emission peaked at 704 nm with a significantly increased EQE of 8.86% and a radiant emittance of 986 μW cm −2 . Our research provides an efficient strategy to tune emission from deep red to near infrared by a simple isomeric engineering of dinuclear platinum(ii ) complexes.