Aggregation-induced phosphorescence emission (AIPE) behaviors in PtII(C^N)(N-donor ligand)Cl-type complexes through restrained D2d deformation of the coordinating skeleton and their optoelectronic properties. Issue 7 (21st January 2021)

• Record Type: Journal Article
• Authors: Yang, Hua; Li, Huiying; Yue, Ling; Chen, Xi; Song, Dongdong; Yang, Xiaolong; Sun, Yuanhui; Zhou, Guijiang; Wu, Zhaoxin
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 7(2021)
• Page Start: 2334
• Page End: 2349
• Publication Date: 2021-01-21
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc05527a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A series of four-coordinated Pt II (C^N)(N-donor ligand)Cl-type complexes have been synthesized to show aggregation-induced phosphorescence emission (AIPE) behaviors and impressive OLED device efficiencies. Abstract : A series of four-coordinated Pt II (C^N)(N-donor ligand)Cl-type complexes have been synthesized through combination between C^N-type and N-donor ligands with different sizes. Photophysical features, electrochemical behaviors and electroluminescent (EL) performances have been investigated in detail. Critically, the relationship between the size of organic ligands and aggregation-induced phosphorescence emission (AIPE) behaviors for these Pt II (C^N)(N-donor ligand)Cl-type complexes has been characterized. With extending the dimensions of the C^N-type and/or N-donor ligands, the AIPE of these Pt II (C^N)(N-donor ligand)Cl-type complexes is more likely to show up with lower H2 O volumetric fractions ( f w ) in the THF solution of these complexes. These unique AIPE experimental results have clearly revealed a new AIE mechanism called restrained D 2d deformation of the coordinating skeleton of these Pt II (C^N)(N-donor ligand)Cl-type complexes from square-planar ( D 4h ) in the ground states to the tetrahedron ( T d ) skeleton in the excited states. In addition, solution-processed organic light-emitting diodes (OLEDs) based on these AIPE emitters have been fabricated to characterize their EL potential. Impressive EL efficiencies with the maximum external quantum efficiency ( η ext ) of 25.2%, current efficiency ( η L ) of 53.9 cd A −1 and power efficiency ( η P ) of 43.5 lm W −1 can be achieved, indicating great potential of these Pt II (C^N)(N-donor ligand)Cl-type AIPE emitters in the field of OLEDs. Importantly, this research has proposed a new AIE mechanism to promote the development of new phosphorescent AIPE complexes with great potential in the field of OLEDs.