Synthesis of Unsymmetric Bipyridine–Pt^II–Alkynyl Complexes through Post‐Click Reaction with Emission Enhancement Characteristics and Their Applications as Phosphorescent Organic Light‐Emitting Diodes

Abstract

Two unsymmetric bipyridine-platinum(II)-alkynyl complexes have been synthesised by a post-click reaction. These metal complexes are found to exhibit emission enhancement properties. The photoluminescence quantum yield can be significantly increased from 0.03 in solution to 0.72 in solid-state thin films. Efficient solution-processable organic light-emitting diodes have been fabricated by utilizing these complexes as phosphorescent dopants. A high external quantum efficiency of up to 5.8% has been achieved.

Solvent‐Induced and Temperature‐Promoted Aggregation of Bipyridine Platinum(II) Triangular Metallacycles and Their Near‐Infrared Emissive Behaviors

“…Meanwhile, remarkable color and luminescent changes are observed as a result of the aggregation–de‐aggregation process . Apart from terpyridine, bipyridine platinum(II) complexes are amongst one of the most important families and are widely studied . With the introduction of aryl‐ or alkyl–alkynyl groups, both the solubility and luminescence quantum yield are improved .…”

Pyrazine based Pt(II) bis‐alkynyl organometallic complexes: Synthesis, characterization, and cytotoxic effect on A549 human lung carcinoma cells

“…As far as organometallic complexes with multiple platinum centers are concerned, several organic motifs such as anthracene, phenanthrene, carbazole, fluorene, truxene, iptycene, oxadiazole, and others have been incorporated . Recently, we have reported Pt(II) organometallic complexes derived from 2,6‐dichloropyrazine as a precursor unit .…”

The electronic structures and photophysical properties of platinum complexes with C^N^N ligands: the influence of the carborane substituent

“…10,11 Moreover, as reported, the photophysical properties of transition metal complexes can be effectively tuned by structurally modifying the coordinated ligands. 3,12,13 Owing to these properties, the platinum(II) complexes have been generally recognized as potential phosphors applied in electroluminescent devices with high phosphorescence quantum efficiencies.…”