A Terminal Carbazole Fused Ladder‐Type B,N‐Doped Multiresonant Thermally Activated Delayed Fluorescence Emitter: A Strategy for Deep‐Blue Emission
- 1Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews UK
- 2Department of Physics Durham University Durham UK
- 3EaStCHEM School of Chemistry The University of Edinburgh Edinburgh UK
Abstract
Attaining precise control of emission within the blue spectral region remains inherently challenging for ladder‐type π‐extended multiresonant thermally activated delayed fluorescent (MR‐TADF) compounds, despite their many advantageous design features. Here, we aim to address the undesired redshifting of the emission in ladder‐type MR‐TADF compounds by incorporating terminal fused carbazoles. We report two MR‐TADF compounds, B2N3 and B3N3, the latter of which is a p‐ and n‐doped heptacene polycyclic aromatic π‐hydrocarbon (PAH), both of which contain fused carbazoles at both ends of the molecule. Relative to the previously reported MR‐TADF compound α‐3BNMes, the emission of B3N3 is blueshifted and narrower, emitting at λPL of 427 nm and having a full width at half maximum (FWHM) of 25 nm in toluene. In contrast, B2N3, which is more conformationally flexible, emits at λPL of 441 nm and has a FWHM of 32 nm in toluene. Sensitized organic light‐emitting diodes (OLEDs) using B2N3 and B3N3 as terminal emitters showed EQEmax of 12.8% and 10.7% emitting with CIE coordinates of (0.15, 0.10) and (0.16, 0.09), respectively.
Related
- Thermally Activated Delayed Fluorescence: An Extended Study of Peripherally Substituted DMAC‐TRZ Analogues
- Thermally activated delayed fluorescence in neutral and cationic stages of aza-nanographene decorated with 6.6.6 defects.
- Theoretical insights into the thermally activated delayed fluorescence of pyridazine derivatives: balancing twist and charge-transfer character
- Efficient Long-Wavelength Through-Space Charge Transfer Thermally Activated Delayed Fluorescence in Conformationally Adaptive Emitters without Conformational Locking
- Phase-Dependent Thermally Activated Self-Discharge of β-NiOOH and γ-NiOOH Electrodes
BibTeX
@article{gupta2026terminal,
title = {{A Terminal Carbazole Fused Ladder‐Type B,N‐Doped Multiresonant Thermally Activated Delayed Fluorescence Emitter: A Strategy for Deep‐Blue Emission}},
author = {Abhishek Kumar Gupta and Shantaram S. Kothavale and Aidan P. McKay and David B. Cordes and Andrew P. Monkman and Michael J. Ingleson and Eli Zysman‐Colman},
journal = {ChemistryEurope},
year = {2026},
month = oct,
doi = {10.1002/ceur.70376},
url = {https://doi.org/10.1002/ceur.70376},
note = {CC BY},
}
RIS
TY - JOUR
TI - A Terminal Carbazole Fused Ladder‐Type B,N‐Doped Multiresonant Thermally Activated Delayed Fluorescence Emitter: A Strategy for Deep‐Blue Emission
AU - Abhishek Kumar Gupta
AU - Shantaram S. Kothavale
AU - Aidan P. McKay
AU - David B. Cordes
AU - Andrew P. Monkman
AU - Michael J. Ingleson
AU - Eli Zysman‐Colman
PY - 2026
DA - 2026/10/23
JO - ChemistryEurope
DO - 10.1002/ceur.70376
UR - https://doi.org/10.1002/ceur.70376
AB - Attaining precise control of emission within the blue spectral region remains inherently challenging for ladder‐type π‐extended multiresonant thermally activated delayed fluorescent (MR‐TADF) compounds, despite their many advantageous design features. Here, we aim to address the undesired redshifting of the emission in ladder‐type MR‐TADF compounds by incorporating terminal fused carbazoles. We report two MR‐TADF compounds, B2N3 and B3N3, the latter of which is a p‐ and n‐doped heptacene polycyclic aromatic π‐hydrocarbon (PAH), both of which contain fused carbazoles at both ends of the molecule. Relative to the previously reported MR‐TADF compound α‐3BNMes, the emission of B3N3 is blueshifted and narrower, emitting at λPL of 427 nm and having a full width at half maximum (FWHM) of 25 nm in toluene. In contrast, B2N3, which is more conformationally flexible, emits at λPL of 441 nm and has a FWHM of 32 nm in toluene. Sensitized organic light‐emitting diodes (OLEDs) using B2N3 and B3N3 as terminal emitters showed EQEmax of 12.8% and 10.7% emitting with CIE coordinates of (0.15, 0.10) and (0.16, 0.09), respectively.
SN - 2751-4765
ER -