Saturated-blue-emitting [3+2+1] coordinated iridium() complexes for vacuum-deposited organic light-emitting devices

A new class of deep-blue phosphorescent [3+2+1] coordinated iridium( iii ) complexes containing phenyl-3 H -imidazo[4,5- b ] pyridine-based (C^C) bidentate ligands have been synthesized, characterized, and applied as phosphorescent dopants in the fabrication of vacuum-deposited organic light-emittin...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-10, Vol.1 (39), p.14616-14625
Main Authors: Zhang, Meng, Ng, Maggie, Wu, Chengcheng, Tong, Kai-Ning, Li, Wansi, Wu, Yuan, Yang, Chen, Wang, Min, Tang, Man-Chung, Wei, Guodan
Format: Article
Language:English
Subjects:
Charge transfer
Decay rate
Devices
Emissions control
Emitters
Iridium compounds
Ligands
Organic light emitting diodes
Phosphorescence
Quantum efficiency
Rate constants
Thin films
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Summary:A new class of deep-blue phosphorescent [3+2+1] coordinated iridium( iii ) complexes containing phenyl-3 H -imidazo[4,5- b ] pyridine-based (C^C) bidentate ligands have been synthesized, characterized, and applied as phosphorescent dopants in the fabrication of vacuum-deposited organic light-emitting devices (OLEDs). The manipulation of the relative bulkiness of the C^C ligands is the key to control the emission energies in solid-state thin films, ranging from 415 to 470 nm. Taking advantages of the intra-ligand charge transfer nature of the emissive state, these complexes display short excited-state lifetimes in the sub-nanosecond regime of 0.3 to 1.1 μs, yielding high radiative decay rate constants on the order of up to 10 6 s −1 . High-performance vacuum-deposited deep-blue-emitting OLEDs have been fabricated based on these complexes, demonstrating an external quantum efficiency (EQE) of 11.2% and Commission International de L'Eclairage (CIE ( x , y )) coordinates of (0.16, 0.07), making them the deepest blue emitters for this class of new [3+2+1] Ir phosphorescent materials. The saturated-blue phosphorescent OLEDs based on the [3+2+1] coordinated iridium( iii ) complexes bearing the phenyl-3H-imidazo[4,5- b ]pyridine-based (C^C) bidentate ligands, demonstrating an EQE of 11.2% and CIE ( x , y ) coordinates of (0.16, 0.07).
ISSN:2050-7526
2050-7534
DOI:10.1039/d2tc02829h