Ortho‐Carborane Decorated Multi‐Resonance TADF Emitters: Preserving Local Excited State and High Efficiency in OLEDs

A novel class of o‐carboranyl luminophores, 2CB‐BuDABNA (1) and 3CB‐BuDABNA (2) is reported, in which o‐carborane moieties are incorporated at the periphery of the B,N‐doped multi‐resonance thermally activated delayed fluorescence (MR‐TADF) core. Both compounds maintain the inherent local emission c...

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Bibliographic Details
Published in:Advanced science 2024-03, Vol.11 (11), p.e2309016-n/a
Main Authors: Lee, Taehwan, Jang, Jee‐Hun, Nguyen, Nhi Ngoc Tuyet, Jung, Jaehoon, Lee, Jeong‐Hwan, Lee, Min Hyung
Format: Article
Language:English
Subjects:
blue OLEDs
Boron
Ligands
local emission
multi‐resonance
o‐carborane
Spectrum analysis
TADF
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Summary:A novel class of o‐carboranyl luminophores, 2CB‐BuDABNA (1) and 3CB‐BuDABNA (2) is reported, in which o‐carborane moieties are incorporated at the periphery of the B,N‐doped multi‐resonance thermally activated delayed fluorescence (MR‐TADF) core. Both compounds maintain the inherent local emission characteristics of their MR‐emitting core, exhibiting intense MR‐TADF with high photoluminescence quantum yields in toluene and rigid states. In contrast, the presence of the dark lowest‐energy charge transfer state, induced by cage rotation in THF, is suggested to be responsible for emission quenching in a polar solvent. Despite the different arrangement of the cage on the DABNA core, both 1 and 2 show red‐shifted emissions compared to the parent compound BuDABNA (3). By utilizing 1 as the emitter, high‐efficiency blue organic light‐emitting diodes (OLEDs) are achieved with a remarkable maximum external quantum efficiency of 25%, representing the highest reported efficiency for OLEDs employing an o‐carboranyl luminophore as the emitter. Ortho‐carborane decorated multi‐resonance induced thermally activated delayed fluorescence (MR‐TADF) emitters are developed. The inherent local emission characteristics of the MR‐emitting core are preserved while being tuned through o‐carborane substitution. The resulting blue OLEDs achieve a remarkable maximum external quantum efficiency of 25%, marking the first demonstration of outstanding OLED performance utilizing an o‐carboranyl luminophore as the emitter.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.202309016