PtII(C^N)(N-donor ligand)Cl-type complexes showing highly sensitive aggregation-induced phosphorescence emission (AIPE) behavior fulfilled by long-size ligands and a distorted molecular configuration

A series of four-coordinated PtII(C^N)(N-donor ligand)Cl-type complexes have been synthesized through a combination of long-size C^N-type and N-donor ligands. In addition, by varying the coordinating site in the N-donor ligand, a distorted molecular configuration has been constructed in these comple...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2023-07, Vol.52 (26), p.8927-8942
Main Authors: Lu, Xinyue, Liu, Siqi, Chen, Xi, Zhao, Feng, Zhong, Daokun, Yang, Xiaolong, Sun, Yuanhui, Su, Bochao, Zhou, Guijiang, Jiao, Bo, Wu, Zhaoxin
Format: Article
Language:English
Subjects:
Configurations
Current efficiency
Efficiency
Electrochemical analysis
Emission analysis
Ligands
Maximum power
Organic light emitting diodes
Phosphorescence
Power efficiency
Quantum efficiency
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Summary:A series of four-coordinated PtII(C^N)(N-donor ligand)Cl-type complexes have been synthesized through a combination of long-size C^N-type and N-donor ligands. In addition, by varying the coordinating site in the N-donor ligand, a distorted molecular configuration has been constructed in these complexes. Their photophysical features, aggregation-induced phosphorescence emission (AIPE) behaviors, electrochemical properties and electroluminescence (EL) performance have been investigated in detail. It has been found that their AIE behaviors can be enhanced by both employing long-size ligands, especially the N-donor ligand, and adopting a distorted molecular configuration, furnishing a high AIE factor (αAIE) of ca. 13.8. Critically, benefitting from their long-size C^N-type and N-donor ligands, these PtII(C^N)(N-donor ligand)Cl-type complexes can exhibit very sensitive AIE behaviors in a mixture of THF–H2O, indicated by their noticeable emission increase with a low H2O volumetric fraction (fw) of ca. 0.1 in their THF solution. In solution-processed organic light-emitting diodes (OLEDs), they can achieve a luminance of 6743 cd m−2 at 13.5 V, a maximum external quantum efficiency (ηext) of 13.8%, a maximum current efficiency (ηL) of 42.4 cd A−1 and a maximum power efficiency (ηP) of 34.4 lm W−1, respectively. Hence, this research can provide key information for developing phosphorescent complexes with a highly sensitive AIE response and impressive EL ability.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt00238a