Achieving 37.1% Green Electroluminescent Efficiency and 0.09 eV Full Width at Half Maximum Based on a Ternary Boron‐Oxygen‐Nitrogen Embedded Polycyclic Aromatic System

Herein, a ternary boron‐oxygen‐nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR‐TADF), namely DBNO, is developed by adopting the para boron‐π‐boron and para oxygen‐π‐oxygen strategy. The designed molecule presents a vivid green em...

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Vydáno v:Angewandte Chemie International Edition Ročník 61; číslo 23; s. e202200337 - n/a
Hlavní autoři: Cai, Xinliang, Xue, Jianan, Li, Chenglong, Liang, Baoyan, Ying, Ao, Tan, Yao, Gong, Shaolong, Wang, Yue
Médium: Journal Article
Jazyk:angličtina
Vydáno: WEINHEIM Wiley 07.06.2022
Wiley Subscription Services, Inc
Vydání:International ed. in English
Témata:
Aromatic hydrocarbons
Boron
Chemistry
Chemistry, Multidisciplinary
Dipole moments
Electroluminescence
Emission spectra
Emissions
Emitters
Light emitting diodes
Molecular structure
Multiple Resonance Effect
Narrowband
Narrowband Emission
Nitrogen
Organic Light-Emitting Diodes
Oxygen
Photoluminescence
Photons
Physical Sciences
Polycyclic Aromatic Hydrocarbon
Quantum efficiency
Science & Technology
Thermally Activated Delayed fluorescence
Thermally Activated Delayed fluorescence
LIGHT-EMITTING-DIODES
Polycyclic Aromatic Hydrocarbon
Narrowband Emission
Organic Light-Emitting Diodes
Multiple Resonance Effect
ACTIVATED DELAYED FLUORESCENCE
EMITTERS
ISSN:1433-7851, 1521-3773, 1521-3773
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Shrnutí:Herein, a ternary boron‐oxygen‐nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR‐TADF), namely DBNO, is developed by adopting the para boron‐π‐boron and para oxygen‐π‐oxygen strategy. The designed molecule presents a vivid green emission with a high photoluminescence quantum yield (96 %) and an extremely narrow full width at half maximum (FWHM) of 19 nm/0.09 eV, which surpasses all previously reported green TADF emitters to date. In addition, the long molecular structure along the transition dipole moment direction endows it with a high horizontal emitting dipole ratio of 96 %. The organic light‐emitting diode (OLED) based on DBNO reveals a narrowband green emission with a peak at 504 nm and a FWHM of 24 nm/0.12 eV. Particularly, a significantly improved device performance is achieved by the TADF‐sensitization (hyperfluorescence) mechanism, presenting a FWHM of 27 nm and a maximum external quantum efficiency (EQE) of 37.1 %. A ternary B−O−N embedded multiple resonance thermally activated delayed fluorescence emitter is developed based on the para B‐π‐B and O‐π‐O strategy. It exhibits a narrowband green emission with a full width at half maximum (FWHM) of 19 nm/0.09 eV and a preferential horizontal dipole ratio of 96 %. The corresponding organic light‐emitting diode (OLED) emits green light with a FWHM of 27 nm and a high external quantum efficiency (EQE) of 37.1 %.
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202200337