☆ 4.8 Article

Macrocyclic Engineering of Thermally Activated Delayed Fluorescent Emitters for High-Efficiency Organic Light-Emitting Diodes

ADVANCED MATERIALS (2023)

Related references

Note: Only part of the references are listed.

Article Materials Science, Multidisciplinary

Long-Lived Emissive Hydrogen-Bonded Macrocycles: Donors Regulating Room-Temperature Phosphorescence and Thermally Activated Delayed Fluorescence

Zecong Ye et al.

Summary: Despite the wide range of applications of macrocycles in supramolecular chemistry, achieving long-lived emissions such as room-temperature phosphorescence or thermally activated delayed fluorescence remains challenging. In this study, hydrogen-bonded macrocycles were developed, which demonstrate room-temperature phosphorescence and thermally activated delayed fluorescence through the introduction of different donors onto a rigid acceptor containing aramide skeleton. The formation of charge transfer and the presence of aromatic carbonyl groups contribute to the enhanced photoluminescence efficiency and intersystem crossing, respectively. The reduced flexibility of the chromophores in the H-bonded macrocyclic framework suppresses nonradiative decay and stabilizes triplet excitons, resulting in the acquisition of room-temperature phosphorescence and thermally activated delayed fluorescence.

ADVANCED OPTICAL MATERIALS (2023)

Add to Collection

Article Chemistry, Multidisciplinary

Indirect Control of Donor/Acceptor Interactions for Highly Efficient Space-Confined Thermally Activated Delayed Fluorescence Emitters

Zi-Qi Feng et al.

Summary: This study reports two TSCT-TADF emitters and successfully enhances their luminescent properties by controlling the molecular configuration without directly modifying the donor or acceptor. The emitter with the fluorine moiety exhibits more evident electrostatic repulsive force onto the central structure, resulting in higher external quantum efficiency.

ADVANCED FUNCTIONAL MATERIALS (2023)

Add to Collection

Article Chemistry, Multidisciplinary

Synthesis of Highly Luminescent Chiral Nanographene

Ji-Kun Li et al.

Summary: In this study, a new design strategy is proposed to achieve chiral nanographenes with high fluorescence quantum yields by helical pi-extension of strongly luminescent chromophores. The synthesized chiral nanographene, with perylene as the core and two dibenzo[6]helicene fragments as the wings, exhibits a record high fluorescence quantum yield of 93% among reported chiral nanographenes and excellent circularly polarized luminescence brightness of 32 M-1 cm(-1).

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2023)

Add to Collection

Article Chemistry, Multidisciplinary

Chiral Thermally Activated Delayed Fluorescence-Active Macrocycles Displaying Efficient Circularly Polarized Electroluminescence

Wen-Long Zhao et al.

Summary: An efficient strategy for constructing chiral macrocycles with both TADF and CPEL properties was developed. The macrocycles exhibited aggregation-induced emission and high photoluminescence quantum yields, and were suitable for the preparation of high-performance circularly polarized organic light-emitting diodes.

CCS CHEMISTRY (2022)

Add to Collection

Article Chemistry, Multidisciplinary

A New Platform of B/N-Doped Cyclophanes: Access to a π-Conjugated Block-Type B3N3 Macrocycle with Strong Dipole Moment and Unique Optoelectronic Properties

Pengfei Li et al.

Summary: In this article, we describe a new design principle for achieving B/N-doped cyclophane. By creating a macrocycle structure with a block of three triarylamines as electron-donor units and a block of three triarylboranes as electron-acceptor units, spatial separation is achieved on opposite sides of the pi-extended ring system. DFT computations reveal the distinct electronic structure and strong intramolecular charge transfer in the excited state of these block-type macrocycles.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

Add to Collection

Article Chemistry, Multidisciplinary

Highly Efficient and Stable Blue Organic Light-Emitting Diodes based on Thermally Activated Delayed Fluorophor with Donor-Void-Acceptor Motif

Dongdong Zhang et al.

Summary: This study proposes a novel D-void-A structure for TADF emitters, which achieves high efficiency and blue-shifted emission by connecting D and A moieties at the void position between donor and acceptor segments. Compared to the contrast D-A isomers, the TADF emitter in this study exhibits more efficient and blue-shifted emission. Additionally, the involvement of the lower HOMO-2 of the acceptor segment in conjugation provides a wider energy gap.

ADVANCED SCIENCE (2022)

Add to Collection

Article Chemistry, Multidisciplinary

One-Shot Synthesis of B/N-Doped Calix[4]arene Exhibiting Narrowband Multiple Resonance Fluorescence

Tianjiao Fan et al.

Summary: A novel macrocycle C-BN was synthesized by a one-shot double boronation. C-BN exhibits a highly centrosymmetric structure, excellent narrowband emitting features, and small full width at half maximums. It is suitable for optimized organic light-emitting diode devices.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

Add to Collection

Article Multidisciplinary Sciences

Delayed fluorescence from inverted singlet and triplet excited states

Naoya Aizawa et al.

Summary: Hund's multiplicity rule predicts a positive energy gap between spin-singlet and spin-triplet excited states, but a fluorescent molecule reported in this study shows a negative singlet-triplet energy gap. This molecule exhibits delayed fluorescence with short time constants and its emissive singlet character leads to anomalous temperature dependence. Organic light-emitting diodes using this molecule demonstrate fast transient electroluminescence decay, indicating potential implications for optoelectronic devices.

NATURE (2022)

Add to Collection

Article Engineering, Environmental

On-off switch between red thermally activated delayed fluorescence and conventional fluorescence by isomeric regulation

Wentao Xie et al.

Summary: Introducing a novel electron acceptor allows for the construction of two bright red light-emitting regioisomers, exhibiting different exciton dynamic processes. The energy gap, energy level alignment, and spin-orbit coupling effects of the molecule play a critical role in the triplet exciton up-conversion processes, leading to high-performance red OLEDs.

CHEMICAL ENGINEERING JOURNAL (2021)

Add to Collection

Article Chemistry, Multidisciplinary

Cyclization-Promoted Ultralong Low-Temperature Phosphorescence via Boosting Intersystem Crossing

Huangtianzhi Zhu et al.

Summary: A cydization-promoted phosphorescence phenomenon is reported, which boosts intersystem crossing. By exploring conjugation, the phosphorescence lifetime is extended and efficiency is increased.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

Add to Collection

Review Chemistry, Multidisciplinary

Identification of the Key Parameters for Horizontal Transition Dipole Orientation in Fluorescent and TADF Organic Light-Emitting Diodes

Francisco Tenopala-Carmona et al.

Summary: Horizontal orientation of the emissive transition dipole moment (TDM) in OLEDs can significantly improve light outcoupling efficiency. Determining the drivers of horizontal orientation, such as emitter molecule aspect ratio and glass-transition temperature (T-g), is crucial. While molecular weight and linearity are key parameters for neat systems, host T-g and emitter length and MW become more relevant in host-guest systems with low and high molecular weight emitters, respectively. Future research should aim to establish a comprehensive model of molecular orientation in OLEDs.

ADVANCED MATERIALS (2021)

Add to Collection

Article Materials Science, Multidisciplinary

Alternating Donor-Acceptor π-Conjugated Macrocycle Exhibiting Efficient Thermally Activated Delayed Fluorescence and Spontaneous Horizontal Molecular Orientation

So Shikita et al.

Summary: The study introduces a versatile design of thermally activated delayed fluorescence (TADF) pi-conjugated macrocycles, which emit efficient green TADF by incorporating D and A units into a cyclo-meta-phenylene motif. Experimental results show that organic light-emitting diodes utilizing macrocycles as emitters display higher external electroluminescence quantum efficiencies compared to devices based on noncyclic emitters.

ADVANCED PHOTONICS RESEARCH (2021)

Add to Collection

Article Chemistry, Multidisciplinary

Thermally Activated Delayed Fluorescent Donor-Acceptor-Donor Acceptor π-Conjugated Macrocycle for Organic Light-Emitting Diodes

Saika Izumi et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

Add to Collection

Article Chemistry, Multidisciplinary

Improving the Efficiency of Red Thermally Activated Delayed Fluorescence Organic Light-Emitting Diode by Rational Isomer Engineering

Tong Yang et al.

ADVANCED FUNCTIONAL MATERIALS (2020)

Add to Collection

Article Chemistry, Multidisciplinary

Highly Efficient Deep-Red Non-Doped Diodes Based on a T-Shape Thermally Activated Delayed Fluorescence Emitter

Bingjie Zhao et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

Add to Collection

Article Chemistry, Physical

Highly efficient luminescence from space-confined charge-transfer emitters

Xun Tang et al.

NATURE MATERIALS (2020)

Add to Collection

Article Optics

Highly efficient blue thermally activated delayed fluorescence emitters based on symmetrical and rigid oxygen-bridged boron acceptors

Dae Hyun Ahn et al.

NATURE PHOTONICS (2019)

Add to Collection

Article Materials Science, Multidisciplinary

Substitution Conformation Balances the Oscillator Strength and Singlet-Triplet Energy Gap for Highly Efficient D-A-D Thermally Activated Delayed Fluorescence Emitters

Xiaofang Wei et al.

ADVANCED OPTICAL MATERIALS (2019)

Add to Collection

Article Optics

Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter

Yasuhiro Kondo et al.

NATURE PHOTONICS (2019)

Add to Collection

Article Chemistry, Multidisciplinary

Intermolecular Charge-Transfer Transition Emitter Showing Thermally Activated Delayed Fluorescence for Efficient Non-Doped OLEDs

Yi-Zhong Shi et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2018)

Add to Collection

Article Chemistry, Multidisciplinary

One-step synthesis of cyclic compounds towards easy room-temperature phosphorescence and deep blue thermally activated delayed fluorescence

Yingyuan Hu et al.

CHEMICAL COMMUNICATIONS (2018)

Add to Collection

Article Optics

Diboron compound-based organic light-emitting diodes with high efficiency and reduced efficiency roll-off

Tien-Lin Wu et al.

NATURE PHOTONICS (2018)

Add to Collection

Article Chemistry, Multidisciplinary

Thermally Activated Delayed Fluorescence and Aggregation Induced Emission with Through-Space Charge Transfer

Hiroyuki Tsujimoto et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2017)

Add to Collection

Article Physics, Applied

Emitter Orientation as a Key Parameter in Organic Light-Emitting Diodes

Tobias D. Schmidt et al.

PHYSICAL REVIEW APPLIED (2017)

Add to Collection

Article Chemistry, Multidisciplinary

A New Design Strategy for Efficient Thermally Activated Delayed Fluorescence Organic Emitters: From Twisted to Planar Structures

Xian-Kai Chen et al.

ADVANCED MATERIALS (2017)

Add to Collection

Review Chemistry, Multidisciplinary

Recent advances in organic thermally activated delayed fluorescence materials

Zhiyong Yang et al.

CHEMICAL SOCIETY REVIEWS (2017)

Add to Collection

Article Chemistry, Multidisciplinary

Design Strategy of Blue and Yellow Thermally Activated Delayed Fluorescence Emitters and Their All-Fluorescence White OLEDs with External Quantum Efficiency beyond 20%

Yunchuan Li et al.

ADVANCED FUNCTIONAL MATERIALS (2016)

Add to Collection

Article Chemistry, Multidisciplinary

Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO-LUMO Separation by the Multiple Resonance Effect

Takuji Hatakeyama et al.

ADVANCED MATERIALS (2016)

Add to Collection

Article Chemistry, Physical

Design of efficient molecular organic light-emitting diodes by a high-throughput virtual screening and experimental approach

Rafael Gomez-Bombarelli et al.

NATURE MATERIALS (2016)

Add to Collection

Article Chemistry, Physical

Highly efficient blue electroluminescence based on thermally activated delayed fluorescence

Shuzo Hirata et al.

NATURE MATERIALS (2015)

Add to Collection

Article Chemistry, Physical

Enhancement of fluorescence in anthracene by chlorination: Vibronic coupling and transition dipole moment density analysis

Motoyuki Uejima et al.

CHEMICAL PHYSICS (2014)

Add to Collection

Article Chemistry, Multidisciplinary

π-Expanded Borazine: An Ambipolar Conjugated B-π-N Macrocycle

Pangkuan Chen et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2012)

Add to Collection

Article Chemistry, Multidisciplinary

Multiwfn: A multifunctional wavefunction analyzer

Tian Lu et al.

JOURNAL OF COMPUTATIONAL CHEMISTRY (2012)

Add to Collection

Article Multidisciplinary Sciences

Highly efficient organic light-emitting diodes from delayed fluorescence

Hiroki Uoyama et al.

NATURE (2012)

Add to Collection

Article Chemistry, Multidisciplinary

Highly Luminescent, Electron-Deficient Bora-cyclophanes

Pangkuan Chen et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2011)

Add to Collection

Article Chemistry, Multidisciplinary

Enhanced pi conjugation around a porphyrin[6] nanoring

Markus Hoffmann et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2008)

Add to Collection

Article Optics

Optical absorption spectra of linear and cyclic thiophenes-selection rules manifestation

M Bednarz et al.

JOURNAL OF LUMINESCENCE (2004)

Add to Collection

© Peeref 2019-2024. All rights reserved.