Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
The development of intramolecular-lock strategy is an appealing task for designing efficient thermally activated delayed fluorescence (TADF) molecules, but only limited examples have been reported so far. Herein we present a "medium ring"-lock strategy to develop TADF emitters for improving the efficiency of organic light-emitting diodes (OLEDs). The installation of an electron-deficient heptagonal diimide lock onto a highly rotatable biphenyl-based emitter not only enhances electron-withdrawing ability of acceptor that decreases singlet-triplet energy gap (ΔE ), but also endows the skeleton with modest rigidity and flexibility that increases photoluminescence quantum yield (PLQY) in neat film. In particular, the integration of the diimide lock also leads to an increase in horizontal orientation factor (Θ ) from 69 % to 83 %. Consequently, this modified intramolecular-lock strategy enables an efficient TADF emitter to assemble high-performance non-doped OLEDs with a high external quantum efficiency of 26.2 % and a power efficiency of 76.6 lm W .
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.202213157 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Design and synthesis of a carbonyl-nitrogen multi-resonance thermally activated delayed fluorophore with enhanced charge transfer for electroluminescence application.
Spectrochim Acta A Mol Biomol Spectrosc
January 2026
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China; Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China. Electronic address:
By employing an "intramolecular lock" strategy, a novel multi-resonance thermally activated delayed fluorescence (MR-TADF) emitter, QAO-PhIDA, has been designed through modulating the excited-state properties of the QAO acceptor using a steric hindrance donor PhIDA. The appropriate electron donor facilitates effective intramolecular charge transfer (ICT), while retaining the MR-TADF characteristics. Additionally, the presence of the bulky donor effectively suppresses the aggregation-caused quenching (ACQ) behavior caused by long-range π-π stacking of the QAO chromophore, which is beneficial for achieving efficient luminescence under solid-state conditions.
View Article and Find Full Text PDFConstructing Intramolecular Locks in the Backbones of TADF Conjugated Polymers for High-Performance Solution-Processed OLEDs.
Small
August 2025
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Designing thermally activated delayed fluorescence (TADF) conjugated polymers for solution-processed OLEDs that achieve high efficiency with low efficiency roll-off remains a significant challenge. Here, an intramolecular lock is introduced into the polymeric backbones to restrict the rotation of flexible single bonds in the benzophenone acceptor, thereby significantly suppressing non-radiative transitions caused by molecular relaxation. Additionally, pyrimidine is incorporated into the acceptor to introduce steric hindrance, which synergistically increases the dihedral angle between the acceptor and donor, minimizing the energy difference between singlet and triplet states (ΔE).
View Article and Find Full Text PDFAn Intramolecular-Lock Facilitates Planar Tricyclic Fused Energetic Compounds.
Org Lett
July 2024
School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China.
Exploiting novel fused cyclic frameworks through simple and efficient methods has provided a blueprint for developing advanced explosives. In this study, six new [5,6,5]-tricyclic fused energetic compounds (-) were synthesized through an intramolecular cyclization strategy involving a C-NH directed cyclization reaction. The work not only boosts the development of fused cyclic energetic compounds but also highlights their potential applications as secondary or heat-resistant explosives.
View Article and Find Full Text PDFMulti-resonance thermally activated delayed fluorescence molecules with intramolecular-lock: theoretical design and performance prediction.
Phys Chem Chem Phys
September 2023
Shandong Key Laboratory of Medical Physics and Image Processing & Shandong Provincial Engineering and Technical Center of Light Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China.
Article Synopsis
- Researchers have focused on multi-resonance thermally activated delayed fluorescence (MR-TADF) molecules with narrow luminescence profiles (FWHM) for improved efficiency.
- A study designed 36 borane/amine (B/N) type MR-TADF molecules using an intramolecular-lock strategy, revealing that different locking positions and methods affect luminescent properties.
- Findings suggest that this strategy can enhance spin-orbit coupling (SOC) and reduce energy gaps between excited states, allowing for more effective reverse intersystem crossing and potentially higher quantum efficiency in MR-TADF emitters.
Modified Intramolecular-Lock Strategy Enables Efficient Thermally Activated Delayed Fluorescence Emitters for Non-Doped OLEDs.
Angew Chem Int Ed Engl
December 2022
Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P. R. of China.
The development of intramolecular-lock strategy is an appealing task for designing efficient thermally activated delayed fluorescence (TADF) molecules, but only limited examples have been reported so far. Herein we present a "medium ring"-lock strategy to develop TADF emitters for improving the efficiency of organic light-emitting diodes (OLEDs). The installation of an electron-deficient heptagonal diimide lock onto a highly rotatable biphenyl-based emitter not only enhances electron-withdrawing ability of acceptor that decreases singlet-triplet energy gap (ΔE ), but also endows the skeleton with modest rigidity and flexibility that increases photoluminescence quantum yield (PLQY) in neat film.
View Article and Find Full Text PDF