Synthesis, Photo-Physical Properties, and Electroluminescence Characteristics of Iridium Phosphorescent Materials Based on Different β-Diketonate Ancillary Ligands
Year: 2025
Type: article
Abstract: Organic light-emitting diodes (OLEDs) based on phosphorescent materials are among the most promising technologies for displays and lightings. For red-emitting heteroleptic iridium complexes (HICs), vast and major research has been focused on the design and synthesis of cyclometalated ligands, while relatively little attention has been given to ancillary ligands which also play important roles in manipulating the optoelectronic and electroluminescent properties of HICs. Seven deep red-emitting HICs were designed and synthesized by systematically modifying the alkyl groups in β-diketone-type ancillary ligands. These HICs exhibited similar physical and optoelectronic properties, with OLED devices based on these materials achieving consistent emission peaks at 624 nm and CIE coordinates of (0.68, 0.32). Among the synthesized HICs, Ir(dmippiq)₂(dmeacac), featuring 3,7-dimethyl-4,6-nonanedione as the ancillary ligand, demonstrated the best OLED performance, achieving a champion external quantum efficiency (EQE) of 18.26%. This result highlights that engineering the alkyl groups in β-diketone ancillary ligands can significantly enhance device performance.
Source: Molecules
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,258
Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, China Postdoctoral Science Foundation, Government of Jiangsu Province, Jilin University, Natural Science Foundation of Jiangsu Province, Natural Science Foundation of Yunnan Province, Suzhou Institute of Nanotechnology, Chinese Academy of Sciences
Awards: G1720995332, G1890540990, G2100786882, G2300677893, G2793229074, G303878767, G3304024224, G4326040325, G4405873788, G4618150881, G5412764588, G5586286603, G5759322707, G5855183837, G5869399038, G5942057624, G6247159882, Ir(C^N)(O^O)2型铱磷光分子的合成及发光性能研究, G6624229327, G6912238467, G7235729152, G7305042778, G7768769653, G7989746438, G8067139252, G8098374550, G854551916, G8584095993
OpenAlex ID: W4407534866