In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 10, No. 39 ( 2022), p. 14616-14625
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702245-6
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