Design of highly stable thermally activated delayed fluorescence emitters via the overlap degree of HOMO-LUMO distributions

Article Chemistry, Multidisciplinary

Achieving Ultimate Narrowband and Ultrapure Blue Organic Light-Emitting Diodes Based on Polycyclo-Heteraborin Multi-Resonance Delayed-Fluorescence Emitters

In Seob Park et al.

Summary: High-efficiency and ultrapure blue OLEDs based on polycyclo-heteraborin multi-resonance thermally activated delayed fluorescence (MR-TADF) materials have been developed, achieving narrowband and ultrapure blue emission.

ADVANCED MATERIALS (2022)

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Article Chemistry, Physical

Photophysical Properties of Benzophenone-Based TADF Emitters in Relation to Their Molecular Structure

Ekin Esme Bas et al.

Summary: In this computational study, the researchers investigated TADF and non-TADF chromophores with benzophenone or its derivatives as the acceptor core and various donor moieties. They computed several excited state properties and utilized them, along with other descriptors, to study the potential TADF efficiency. The results showed that their descriptors and computational methodologies can effectively predict experimental results and provide guidance for future research on benzophenone-based TADF emitters.

JOURNAL OF PHYSICAL CHEMISTRY A (2022)

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Article Chemistry, Physical

Enhancing Thermally Activated Delayed Fluorescence by Fine-Tuning the Dendron Donor Strength

Eimantas Duda et al.

Summary: Thermally activated delayed fluorescence (TADF) relies on a small energy gap between the emissive singlet and the nonemissive triplet state, and this study demonstrates a method of fine-tuning the emitter photoluminescence properties by changes in the functionality of the donor dendrons.

JOURNAL OF PHYSICAL CHEMISTRY B (2022)

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Article Materials Science, Multidisciplinary

A deep blue thermally activated delayed fluorescence emitter: balance between charge transfer and color purity

Bahadur Sk et al.

Summary: This study demonstrates the role of donor substitution position in achieving deep blue emission with improved color purity in an efficient blue organic light-emitting diode (OLED) device. A novel emitter is synthesized with low Delta E-ST value, high photoluminescence quantum yield, and narrow emission spectra. The OLED device using this emitter shows high external quantum efficiency and deep blue emission. This study paves the way for developing deep-blue TADF emitters with high efficiency and color purity.

JOURNAL OF MATERIALS CHEMISTRY C (2022)

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Article Chemistry, Multidisciplinary

Modular Nitrogen-Doped Concave Polycyclic Aromatic Hydrocarbons for High-Performance Organic Light-Emitting Diodes with Tunable Emission Mechanisms

Jakub Wagner et al.

Summary: In this study, the synthesis and characterization of curved and fully conjugated nitrogen-doped PAHs were reported. By modifying the structure of the electron-accepting moiety, the luminescence mechanism was switched between TADF and RTP, and the overall PLQY was tuned in the range of 9% to 86%. Solid-state OLED devices were constructed, achieving a high external quantum efficiency.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Chemistry, Multidisciplinary

Circularly polarized-thermally activated delayed fluorescent materials based on chiral bicarbazole donors

Laurelie Poulard et al.

Summary: In this study, we developed a molecular design strategy to synthesize circularly polarized thermally activated delayed fluorescence emitters. The chiral bicarbazole donors were connected to acceptor units via a rigid 8-membered cycle. The effects of the donor and acceptor units on the photophysical and chiroptical properties were investigated.

CHEMICAL COMMUNICATIONS (2022)

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Article Nanoscience & Nanotechnology

Spiral Donor Design Strategy for Blue Thermally Activated Delayed Fluorescence Emitters

Wei Li et al.

Summary: This study investigates the importance of energy level relationships between spiral donors and luminophores on the photoluminescent quantum yields of materials, and proposes the use of quantum chemistry simulations to accurately predict these relationships. The optimized molecular structure and energy alignment play a key role in enhancing the performance of TADF emitters. Ultimately, the TADF emitter DspiroS-TRZ achieved remarkable results with 99.9% PLQY and 38.4% EQE, the highest reported among all blue TADF emitters to date.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Review Chemistry, Multidisciplinary

A Brief History of OLEDs-Emitter Development and Industry Milestones

Gloria Hong et al.

Summary: Organic light-emitting diodes (OLEDs) have undergone significant development over the past 30 years, with advancements in emitter materials leading to three generations of OLED devices. Research is now focused on the fourth generation of OLEDs, with academia and industry achieving milestones in the development of green, orange-red, and blue OLED emitters.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Face-to-Face Orientation of Quasiplanar Donor and Acceptor Enables Highly Efficient Intramolecular Exciplex Fluorescence

Chao Wu et al.

Summary: Intramolecular through-space charge-transfer (TSCT) excited states are utilized for developing thermally activated delayed fluorescence (TADF) emitters, with a series of precisely controlled TSCT emitters designed through alignment optimization of donor and acceptor segments. By increasing intramolecular pi-pi interactions, radiative decay rate of the lowest singlet excited state (S-1) is progressively enhanced with suppression of nonradiative decay, leading to significantly improved photoluminescence quantum yields of up to 0.99 in doped thin films. A high-efficiency electroluminescence device achieves a maximum external quantum efficiency (EQE) of 23.96% and maintains >20% at a brightness of 1000 cd m(-2), highlighting the importance of conformation control for high-efficiency intramolecular exciplex emitters.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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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)

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Article Chemistry, Applied

A versatile carbazole donor design strategy for blue emission switching from normal fluorescence to thermally activated delayed fluorescence

Rui Niu et al.

Summary: By introducing a methyl group at the 1-site of carbazole, a versatile donor for blue TADF materials was successfully constructed in this study. The combination of 1-MeCz as donor with triazine and pyrimidine as acceptors led to a switch from normal fluorescence to TADF, resulting in blue emission with good performance in organic light-emitting diodes.

DYES AND PIGMENTS (2021)

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Article Materials Science, Multidisciplinary

Malononitrile based ternary AIE-ML materials: Experimental proof for emission switch from non-TADF to TADF

Tianyou Luo et al.

Summary: Three malononitrile based D-A-D compounds exhibit good thermal stability and solvatochromic behavior, with aggregation-induced emission and mechanochromic luminescence observed in their solid states. DPMM-2TPA and DPMM-2DMAC show red fluorescence, while DPMM-2PhCz cannot achieve delayed fluorescence due to energy level differences. OLEDs based on DPMM-2TPA and DPMM-2DMAC have significantly higher EQE compared to DPMM-2PhCz based OLEDs.

ORGANIC ELECTRONICS (2021)

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Article Chemistry, Multidisciplinary

Fast Delayed Emission in New Pyridazine-Based Compounds

Simonas Krotkus et al.

Summary: Three novel donor-acceptor molecules with the Pydz acceptor moiety were synthesized and characterized. Among them, dPXZMePydz exhibited high reverse intersystem crossing rate and fast thermally activated delayed fluorescence, while compounds with weaker donor units did not show these properties.

FRONTIERS IN CHEMISTRY (2021)

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Article Chemistry, Multidisciplinary

Indolo[3,2,1-jk]carbazole Embedded Multiple-Resonance Fluorophors for Narrowband Deep-blue Electroluminescence with EQE≈34.7 % and CIEy≈0.085

Jinbei Wei et al.

Summary: The strategic implementation of ICz subunits into MR fluorophors has led to the development of deep blue organic emitters with extremely small FWHMs and high photoluminescence quantum yields.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Approaching Nearly 40% External Quantum Efficiency in Organic Light Emitting Diodes Utilizing a Green Thermally Activated Delayed Fluorescence Emitter with an Extended Linear Donor-Acceptor-Donor Structure

Yang Chen et al.

Summary: The study developed a high-performance TADF emitter with controlled molecular orientation and optoelectronic properties, achieving high quantum yield and fast intersystem crossing rate. The corresponding OLED device demonstrated impressive efficiency performance, pushing the device efficiency towards theoretical limits.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Multi-Resonance Deep-Red Emitters with Shallow Potential-Energy Surfaces to Surpass Energy-Gap Law

Yuewei Zhang et al.

Summary: Efficient deep-red organic emitters with high quantum efficiencies were developed by constructing polycyclic heteroaromatics with multiple boron and nitrogen atoms. The introduction of specific structures led to restricted π-bonding states and shallow potential energy surfaces, enabling the emitters to achieve high quantum efficiencies in a normal planar organic light-emitting diode structure.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Realizing Record-High Electroluminescence Efficiency of 31.5 % for Red Thermally Activated Delayed Fluorescence Molecules

Zheyi Cai et al.

Summary: Tailor-made red TADF molecules with intramolecular hydrogen bonding show NIR emissions in neat films and red delayed fluorescence in doped films, with high photoluminescence quantum yields. They exhibit high optical out-coupling factors due to their horizontal orientation in films. The non-doped OLEDs emit NIR lights with maximum external quantum efficiencies, while doped OLEDs achieve record-breaking efficiency levels with red lights emission. These new red TADF materials have great potentials in display and lighting devices.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Simultaneously Enhanced Reverse Intersystem Crossing and Radiative Decay in Thermally Activated Delayed Fluorophors with Multiple Through-space Charge Transfers

Tianyu Huang et al.

Summary: Materials with thermally activated delayed fluorescence (TADF) and through-space charge transfer (CT) properties have received significant attention recently. By developing TADF molecules with ortho-linked multiple donors-acceptor motif, near-degenerate excited states are created to enhance spin-orbit coupling, leading to improved luminescence performance.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Materials Science, Multidisciplinary

Deep-blue thermally activated delayed fluorescence emitter with a very high fluorescence rate

Haonan Wang et al.

Summary: A deep blue TADF molecule was prepared using a small EEST pyridine-phenol fluoroboron complex as the acceptor, maintaining a small EEST by attaching carbazole donors to the phenyl rings. The compound exhibited a high fluorescence rate and small D-A dihedral angle change in the excited state, leading to nearly 100% PL quantum yield and a narrow PL spectrum. A TADF-sensitized fluorescence device containing this molecule achieved a high external quantum efficiency and improved color coordinates compared to a control device.

ORGANIC ELECTRONICS (2021)

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Article Chemistry, Multidisciplinary

Phenyl-triggered photophysical switching between normal fluorescence and delayed fluorescence in phthalonitrile-based luminophores

In Seob Park et al.

Summary: A facile strategy for switching luminescent properties between normal fluorescence and thermally activated delayed fluorescence (TADF) is proposed through structural modulation, where two luminophoric molecules, VPN-Ph and VPN-H, are compared. The introduction of phenyl group in VPN-Ph leads to TADF feature, resulting in significantly higher external electroluminescence (EL) quantum efficiency in an organic light-emitting diode (OLED) compared to VPN-H. Phenyl-triggered geometric modulation has a drastic impact on the resulting photophysical and EL properties, leading to TADF on/off switching.

AGGREGATE (2021)

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Article Nanoscience & Nanotechnology

Diboron-Based Delayed Fluorescent Emitters with Orange-to-Red Emission and Superior Organic Light-Emitting Diode Efficiency

Chia-Min Hsieh et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

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Review Chemistry, Organic

Structural Design of Blue-to-Red Thermally-Activated Delayed Fluorescence Molecules by Adjusting the Strength between Donor and Acceptor

Weilong Che et al.

ASIAN JOURNAL OF ORGANIC CHEMISTRY (2020)

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Review Optics

Mini-LED, Micro-LED and OLED displays: present status and future perspectives

Yuge Huang et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Chemistry, Physical

Highly efficient luminescence from space-confined charge-transfer emitters

Xun Tang et al.

NATURE MATERIALS (2020)

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Article Engineering, Environmental

Asymmetrically phosphorylated carbazole host for highly efficient blue and white thermally activated delayed fluorescence diodes

Chunmiao Han et al.

CHEMICAL ENGINEERING JOURNAL (2020)

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Review Materials Science, Multidisciplinary

Effects of the relative position and number of donors and acceptors on the properties of TADF materials

Feng-Ming Xie et al.

JOURNAL OF MATERIALS CHEMISTRY C (2020)

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Article Chemistry, Multidisciplinary

Simultaneous enhancement of efficiency and stability of OLEDs with thermally activated delayed fluorescence materials by modifying carbazoles with peripheral groups

Yunge Zhang et al.

SCIENCE CHINA-CHEMISTRY (2019)

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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)

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Article Materials Science, Multidisciplinary

TADF activation by solvent freezing: The role of nonradiative triplet decay and spin-orbit coupling in carbazole benzonitrile derivatives

T. Hosokai et al.

SYNTHETIC METALS (2019)

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Article Chemistry, Physical

Inverted Singlet-Triplet Gaps and Their Relevance to Thermally Activated Delayed Fluorescence

Piotr de Silva

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2019)

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Article Chemistry, Multidisciplinary

Substitution Effect on Luminescence of 5H-Indeno[1,2-b] pyridin-5-one Based Isomers

Di Liu et al.

CHEMISTRYSELECT (2019)

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Article Chemistry, Multidisciplinary

Cover Picture: Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency (Angew. Chem. Int. Ed. 41/2019)

Jia-Xiong Chen et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

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Review Chemistry, Multidisciplinary

Thermally Activated Delayed Fluorescence Materials: Towards Realization of High Efficiency through Strategic Small Molecular Design

Xiao Liang et al.

CHEMISTRY-A EUROPEAN JOURNAL (2019)

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Article Materials Science, Multidisciplinary

6H-Benzo[4,5]thieno[2,3-b]indole as a novel donor for efficient thermally activated delayed fluorescence emitters with EQEs over 20%

Rajendra Kumar Konidena et al.

JOURNAL OF MATERIALS CHEMISTRY C (2019)

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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)

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Review Nanoscience & Nanotechnology

All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes

Yuchao Liu et al.

NATURE REVIEWS MATERIALS (2018)

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Article Multidisciplinary Sciences

Excited state engineering for efficient reverse intersystem crossing

Hiroki Noda et al.

SCIENCE ADVANCES (2018)

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Review Chemistry, Multidisciplinary

Marching Toward Highly Efficient, Pure-Blue, and Stable Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes

Xinyi Cai et al.

ADVANCED FUNCTIONAL MATERIALS (2018)

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Article Nanoscience & Nanotechnology

Rigidity-Induced Delayed Fluorescence by Ortho Donor-Appended Triarylboron Compounds: Record-High Efficiency in Pure Blue Fluorescent Organic Light-Emitting Diodes

Young Hoon Lee et al.

ACS APPLIED MATERIALS & INTERFACES (2017)

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Article Chemistry, Multidisciplinary

Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes

Michael Y. Wong et al.

ADVANCED MATERIALS (2017)

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Review Chemistry, Physical

Molecular Design Strategy of Organic Thermally Activated Delayed Fluorescence Emitters

Yirang Im et al.

CHEMISTRY OF MATERIALS (2017)

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Article Chemistry, Multidisciplinary

Efficiency Roll-Off in Blue Emitting Phosphorescent Organic Light Emitting Diodes with Carbazole Host Materials

Chaoyu Xiang et al.

ADVANCED FUNCTIONAL MATERIALS (2016)

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Article Chemistry, Multidisciplinary

Stable Blue Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes with Three Times Longer Lifetime than Phosphorescent Organic Light-Emitting Diodes

Mounggon Kim et al.

ADVANCED MATERIALS (2016)

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Article Chemistry, Physical

Effect of Substituents on the Electronic Structure and Degradation Process in Carbazole Derivatives for Blue OLED Host Materials

Minki Hong et al.

CHEMISTRY OF MATERIALS (2016)

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Article Materials Science, Multidisciplinary

Dimesitylarylborane-based luminescent emitters exhibiting highly-efficient thermally activated delayed fluorescence for organic light-emitting diodes

Yuichi Kitamoto et al.

ORGANIC ELECTRONICS (2016)

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Article Chemistry, Multidisciplinary

Sterically shielded blue thermally activated delayed fluorescence emitters with improved efficiency and stability

Dongdong Zhang et al.

MATERIALS HORIZONS (2016)

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Dicarbazolyldicyanobenzenes as Thermally Activated Delayed Fluorescence Emitters: Effect of Substitution Position on Photo luminescent and Electroluminescent Properties

Bo Li et al.

CHEMISTRY LETTERS (2014)

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Article Chemistry, Physical

Molecular Understanding of the Chemical Stability of Organic Materials for OLEDs: A Comparative Study on Sulfonyl, Phosphine-Oxide, and Carbonyl-Containing Host Materials

Na Lin et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2014)

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Article Optics

Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence

Qisheng Zhang et al.

NATURE PHOTONICS (2014)

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Chemical Degradation in Organic Light-Emitting Devices: Mechanisms and Implications for the Design of New Materials

Susanna Schmidbauer et al.

ADVANCED MATERIALS (2013)

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Article Chemistry, Physical

Bond Order Analysis Based on the Laplacian of Electron Density in Fuzzy Overlap Space

Tian Lu et al.

JOURNAL OF PHYSICAL CHEMISTRY A (2013)

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Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence

Kensuke Masui et al.

ORGANIC ELECTRONICS (2013)

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Multiwfn: A multifunctional wavefunction analyzer

Tian Lu et al.

JOURNAL OF COMPUTATIONAL CHEMISTRY (2012)

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Highly efficient organic light-emitting diodes from delayed fluorescence

Hiroki Uoyama et al.

NATURE (2012)

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Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion

Kenichi Goushi et al.

NATURE PHOTONICS (2012)

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Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes

Ayataka Endo et al.

APPLIED PHYSICS LETTERS (2011)

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Degradation Mechanisms in Small-Molecule and Polymer Organic Light-Emitting Diodes

Franky So et al.

ADVANCED MATERIALS (2010)

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Role of chemical reactions of arylamine hole transport materials in operational degradation of organic light-emitting diodes

Denis Y. Kondakov

JOURNAL OF APPLIED PHYSICS (2008)

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The M06 suite of density functionals for main group thermochemistry, thermochemical kinetics, noncovalent interactions, excited states, and transition elements: two new functionals and systematic testing of four M06-class functionals and 12 other functionals

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THEORETICAL CHEMISTRY ACCOUNTS (2008)

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Design of highly stable thermally activated delayed fluorescence emitters via the overlap degree of HOMO-LUMO distributions

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