期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 15, 期 19, 页码 3003-3012出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202000544
关键词
OLEDs; Platinum(II) complexes; Binuclear; Asymmetric bridging ligand
资金
- National Natural Science Foundation of China [U1663229, 51473140, 51573154]
- Hunan Postgraduate Science Foundation for Innovation [CX2017B298]
- Open Project for the National Key Laboratory of Luminescent Materials and Devices [2017-skllmd-12]
- Brand Specialty &Preponderant Discipline Construction Projects of Jiangsu Higher Education Institutions
Bimetallic complexes have become an emerging hot topic in field of luminous applications in recent years. Unlike the traditional modification on a cyclometalated ligand, grafting an additional metal ion provides a novel approach to tune molecular conjugation as well as the spin orbital coupling (SOC). Herein, we demonstrate a new kind of binuclear platinum(II) complex Pt-3 that possesses an asymmetric thiophenpyridine-isoquinoline bridging ligand. Compared to its mononuclear analogues of Pt-1 and Pt-2, an extremely large redshift emission from 576 and 618 nm to 721 nm was observed in solution. Binding of two metal ions helps to enhance molecular planarity, extend conjugation and suppress excited state distortion. However, their quantum yields tend to remarkably decrease with increasing red-shift emission as following the energy gap law. The relatively larger HOMO/LUMO separation that induced by the second platinum ion also decreases the oscillator strength at the lowest singlet state, and goes against the fast radiative decay process. Solution-processed organic light-emitting diodes (OLEDs) based on Pt-1, Pt-2 and Pt-3 achieved external quantum efficiencies (EQEs) and luminance/radiant emittance of 13.6% and 13640 cd/m(2), 3.5% and 3754 cd/m(2), 0.9% and 7981 mW/Sr/m(2)with the corresponding electroluminescent (EL) emission peaked at 580 nm, 625 nm and 708 nm, respectively. This work emphasizes the complement argument of the commonly largely reported symmetric binuclear configurations, and provides a new view to photophysical mechanism and design strategies for bimetallic species.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据