High-Efficiency and Narrowband OLEDs from Blue to Yellow with Ternary Boron/Nitrogen-Based Polycyclic Heteroaromatic Emitters

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 Materials Science, Multidisciplinary

Fused π-Extended Multiple-Resonance Induced Thermally Activated Delayed Fluorescence Materials for High-Efficiency and Narrowband OLEDs with Low Efficiency Roll-Off

Xu-Feng Luo et al.

Summary: A new strategy for achieving multiple-resonance thermally activated delayed fluorescence (MR-TADF) materials with strong narrowband emission and efficient reverse intersystem crossing (RISC) process is proposed, which involves fusing high-triplet-energy units into boron-nitrogen framework.

ADVANCED OPTICAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Carbazole-Based DABNA Analogues as Highly Efficient Thermally Activated Delayed Fluorescence Materials for Narrowband Organic Light-Emitting Diodes

Susumu Oda et al.

Summary: Carbazole-based DABNA analogues were synthesized through regioselective one-shot single and double borylation, demonstrating narrowband thermally activated delayed fluorescence. Organic light-emitting diode devices utilizing these products as emitters exhibited deep-blue, sky-blue, and green emission with high external quantum efficiencies.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Engineering, Environmental

Heavy-atom effect promotes multi-resonance thermally activated delayed fluorescence

Tao Hua et al.

Summary: The development of MR-TADF materials, incorporating sulfur atom into the B-N based framework, has led to significant improvements in the performance of organic light-emitting diodes, resulting in highly efficient green emission with maximum external quantum efficiency.

CHEMICAL ENGINEERING JOURNAL (2021)

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Article Chemistry, Organic

Fully Bridged Triphenylamine Derivatives as Color-Tunable Thermally Activated Delayed Fluorescence Emitters

Sheng-Nan Zou et al.

Summary: Three emissive bridged-triphenylamine derivatives incorporating carbon, oxygen, and sulfur atoms with two carbonyl groups exhibit potential as narrowband thermally activated delayed fluorescence emitters. Organic light-emitting diodes based on these derivatives achieve high external quantum efficiencies for blue, green, and yellow emissions.

ORGANIC LETTERS (2021)

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Article Materials Science, Multidisciplinary

Carbazole-Based Iridium(III) Complexes for Electrophosphorescence with EQE of 32.2% and Low Efficiency Roll-Off

Xu-Feng Luo et al.

Summary: The synthesis and application of three efficient Cz-based Ir(III) complexes for OLEDs show improved photoelectric properties and achieve high-efficiency luminescence, demonstrating the potential of these complexes incorporating Cz units for efficient OLEDs.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

cis-Quinacridone-Based Delayed Fluorescence Emitters: Seemingly Old but Renewed Functional Luminogens

Hyukgi Min et al.

Summary: In this study, a material design using linear cis-quinacridone derivatives as delayed fluorescence luminogens for OLEDs was investigated. The cis-QA derivatives showed potential as narrowband deep-blue delayed fluorescence emitters with high efficiencies and color purity. The best-performing deep-blue OLEDs utilizing these cis-QA luminogens achieved up to 19.0% external electroluminescence quantum efficiencies and high color purity.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Optics

The role of host-guest interactions in organic emitters employing MR-TADF

Xiugang Wu et al.

Summary: The study reveals that effective multiple-resonance thermally activated delayed fluorescence requires suitable host-guest interactions to boost TADF. Additionally, this boosted-TADF mechanism can be applied to any fluorescence dye with a thermally accessible energy gap, enabling the development of high-performance organic light-emitting diodes.

NATURE PHOTONICS (2021)

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Article Chemistry, Multidisciplinary

Dual Trapping of a Metastable Planarized Triarylborane π-System Based on Folding and Lewis Acid-Base Complexation for Seeded Polymerization

Heekyoung Choi et al.

Summary: This study reports kinetically controlled supramolecular polymerization of boron-containing p-conjugated molecules using a seeding method based on dual trapping of a metastable state. The formation of helical supramolecular nanostructures with intense J-type aggregate emission was achieved through cooperative supramolecular polymerization. The presence of a Lewis acid-base complex enhanced the stabilization of the metastable monomeric state, allowing for successful production of homogeneous nanofibers even at high concentrations.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Chemistry, Multidisciplinary

Novel boron- and sulfur-doped polycyclic aromatic hydrocarbon as multiple resonance emitter for ultrapure blue thermally activated delayed fluorescence polymers

Fan Chen et al.

Summary: The combination of boron and sulfur-doped polycyclic aromatic hydrocarbons forms an intramolecular push-pull electronic system in rigid aromatic frameworks, which plays a critical role in reducing energy splitting and excited state relaxation, leading to efficient blue electroluminescence with narrowband emission in polymers. The sulfur atom in determining emission properties by reducing energy bandgap and promoting TADF effect through heavy-atom effect.

SCIENCE CHINA-CHEMISTRY (2021)

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Article Multidisciplinary Sciences

Thermal equilibration between singlet and triplet excited states in organic fluorophore for submicrosecond delayed fluorescence

Naoya Aizawa et al.

Summary: By achieving thermal equilibration between singlet and triplet excited states through fast spin-flipping reverse intersystem crossing, a novel organic fluorophore exhibits a short emission lifetime, enabling organic light-emitting diodes to demonstrate quantum efficiency exceeding 20%.

SCIENCE ADVANCES (2021)

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Article Chemistry, Multidisciplinary

Peripheral Decoration of Multi-Resonance Molecules as a Versatile Approach for Simultaneous Long-Wavelength and Narrowband Emission

Yanyu Qi et al.

Summary: A new approach of peripherally decorating MR emitter with electron donors enables the emission spectra of MR emitters to red-shift while retaining narrowband emission, leading to the realization of the first narrowband yellow emitter with emission maxima of 562 nm and excellent color purity. Highly efficient OLEDs with an external quantum efficiency of over 24% are fabricated by employing these newly developed MR molecules as emitters.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Highly Efficient Electroluminescence from Narrowband Green Circularly Polarized Multiple Resonance Thermally Activated Delayed Fluorescence Enantiomers

Yincai Xu et al.

Summary: In this study, highly efficient organic light-emitting diodes that exhibit pure green emission and circularly polarized electroluminescence signal were developed by integrating circularly polarized luminescence and thermally activated delayed fluorescence emission induced by multiple resonance effect. This represents a significant advancement in the field of organic electronics.

ADVANCED MATERIALS (2021)

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Article Nanoscience & Nanotechnology

Blue TADF Emitters Based on B-Heterotriangulene Acceptors for Highly Efficient OLEDs with Reduced Efficiency Roll-Off

Young Hoon Lee et al.

Summary: Robust boron acceptors are crucial for the development of efficient and stable blue TADF-OLEDs. The newly reported B-heterotriangulene compounds exhibit blue emissions with fast reverse intersystem crossing rates, promoted by strong spin-orbit coupling. Devices based on compounds with fully dimethylmethylene-bridged emitter achieved the highest maximum EQE and lowest efficiency roll-off.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Article Chemistry, Multidisciplinary

Fused-Nonacyclic Multi-Resonance Delayed Fluorescence Emitter Based on Ladder-Thiaborin Exhibiting Narrowband Sky-Blue Emission with Accelerated Reverse Intersystem Crossing

Masakazu Nagata et al.

Summary: This study successfully developed a new organic luminophore, BSBS-N1, with strong narrowband emission capability and high photoluminescence quantum yield. By introducing boron, nitrogen, and sulfur atoms, as well as spin-orbit coupling of two sulfur atoms, the performance of the luminophore was enhanced, leading to an improvement in the electroluminescence quantum efficiency.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Wide-Range Color Tuning of Narrowband Emission in Multi-resonance Organoboron Delayed Fluorescence Materials through Rational Imine/Amine Functionalization

Minlang Yang et al.

Summary: Establishing a simple and versatile design strategy to modulate emission colors while maintaining high efficiency and color purity is challenging for MR-TADF materials. By introducing specific functional groups, it is possible to achieve fine tuning of emission colors without compromising narrow spectral features, leading to the development of high-efficiency and color-pure organic light-emitting diodes.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Boron-Doped Polycyclic π-Electron Systems with an Antiaromatic Borole Substructure That Forms Photoresponsive B-P Lewis Adducts

Naoki Ando et al.

Summary: Incorporating a five-membered borole ring into a polycyclic aromatic hydrocarbon imparts the pi-system with antiaromatic character, inducing unique properties and behavior. Synthesized borole-embedded pi-conjugated compounds exhibit planar structures and columnar face-to-face pi-stacked structures. One derivative shows intense emission with high quantum yield and high Lewis acidity.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Materials Science, Multidisciplinary

A Series of Fused Carbazole/Carbonyl Based Blue to Yellow-Green Thermally Activated Delayed Fluorescence Materials for Efficient Organic Light-Emitting Diodes

Xu-Feng Luo et al.

Summary: The development of novel fused carbazole/carbonyl based TADF emitters through a new synthetic strategy allows for tunable emissions from blue to yellow-green in OLEDs. These emitters show high external quantum efficiency and narrow full width at half maximum, demonstrating their potential for efficient TADF emitters in OLED applications.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Hypsochromic Shift of Multiple-Resonance-Induced Thermally Activated Delayed Fluorescence by Oxygen Atom Incorporation

Hiroyuki Tanaka et al.

Summary: This study reported an ultrapure blue fluorescent material (nu-DABNA-O-Me) with high photoluminescence quantum yield and a large rate constant for reverse intersystem crossing. An organic light-emitting diode based on this material exhibited excellent performance, demonstrating the significant potential of the oxygen atom incorporation strategy.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Molecular design of thermally activated delayed fluorescent emitters for narrowband orange-red OLEDs boosted by a cyano-functionalization strategy

Yang Liu et al.

Summary: By attaching a cyano functionality at the lowest unoccupied molecular orbital location of the MR-TADF skeleton, the red-shifted emission and good color purity of orange-red MR-TADF emitters can be achieved. The coplanar conformation of the CN group helps to restrict structure relaxation and maintain the high-quality emission characteristics in orange-red TADF-OLEDs.

CHEMICAL SCIENCE (2021)

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Article Chemistry, Multidisciplinary

Optical Supramolecular Sensing of Creatinine

Andres F. Sierra et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

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Article Chemistry, Multidisciplinary

A Deep Blue B,N-Doped Heptacene Emitter That Shows Both Thermally Activated Delayed Fluorescence and Delayed Fluorescence by Triplet-Triplet Annihilation

Subeesh Madayanad Suresh et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

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Article Nanoscience & Nanotechnology

Multicolor Circularly Polarized Photoluminescence and Electroluminescence with 1,2-Diaminecyclohexane Enantiomers

Xu-Feng Luo et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

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Article Materials Science, Multidisciplinary

Improving Processability and Efficiency of Resonant TADF Emitters: A Design Strategy

David Hall et al.

ADVANCED OPTICAL MATERIALS (2020)

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Molecular-Structure and Device-Configuration Optimizations toward Highly Efficient Green Electroluminescence with Narrowband Emission and High Color Purity

Yincai Xu et al.

ADVANCED OPTICAL MATERIALS (2020)

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Article Chemistry, Multidisciplinary

Single-Molecule Conductance through an Isoelectronic B-N Substituted Phenanthrene Junction

Zhi-Hao Zhao et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

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Constructing Charge-Transfer Excited States Based on Frontier Molecular Orbital Engineering: Narrowband Green Electroluminescence with High Color Purity and Efficiency

Yincai Xu et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

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Article Chemistry, Multidisciplinary

Achieving Pure Green Electroluminescence with CIEy of 0.69 and EQE of 28.2% from an Aza-Fused Multi-Resonance Emitter

Yuewei Zhang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

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Article Chemistry, Multidisciplinary

Solution-Processable Pure Green Thermally Activated Delayed Fluorescence Emitter Based on the Multiple Resonance Effect

Naoya Ikeda et al.

ADVANCED MATERIALS (2020)

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Long-Lived Charge-Transfer State from B-N Frustrated Lewis Pairs Enchained in Supramolecular Copolymers

Beatrice Adelizzi et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

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Article Chemistry, Multidisciplinary

Full-Color, Narrowband, and High-Efficiency Electroluminescence from Boron and Carbazole Embedded Polycyclic Heteroaromatics

Minlang Yang et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

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Article Materials Science, Multidisciplinary

Pentacyclic Ladder-Heteraborin Emitters Exhibiting High-Efficiency Blue Thermally Activated Delayed Fluorescence with an Ultrashort Emission Lifetime

Tomohiro Agou et al.

ACS MATERIALS LETTERS (2020)

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Highly emissive excitons with reduced exchange energy in thermally activated delayed fluorescent molecules

Anton Pershin et al.

NATURE COMMUNICATIONS (2019)

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Tunable Low-LUMO Boron-Doped Polycyclic Aromatic Hydrocarbons by General One-Pot C-H Borylations

Jeffrey M. Farrell et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2019)

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

Yasuhiro Kondo et al.

NATURE PHOTONICS (2019)

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Multi-Resonance Induced Thermally Activated Delayed Fluorophores for Narrowband Green OLEDs

Yuewei Zhang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

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Multiple Resonance Effect-Induced Sky-Blue Thermally Activated Delayed Fluorescence with a Narrow Emission Band

Susumu Oda et al.

ORGANIC LETTERS (2019)

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Adamantane-Substituted Acridine Donor for Blue Dual Fluorescence and Efficient Organic Light-Emitting Diodes

Wei Li et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

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Two-Dimensional Kagome Lattices Made of Hetero Triangulenes Are Dirac Semimetals or Single-Band Semiconductors

Yu Jing et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2019)

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The Design of Fused Amine/Carbonyl System for Efficient Thermally Activated Delayed Fluorescence: Novel Multiple Resonance Core and Electron Acceptor

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High-Performance Dibenzoheteraborin-Based Thermally Activated Delayed Fluorescence Emitters: Molecular Architectonics for Concurrently Achieving Narrowband Emission and Efficient Triplet-Singlet Spin Conversion

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High-Efficiency and Narrowband OLEDs from Blue to Yellow with Ternary Boron/Nitrogen-Based Polycyclic Heteroaromatic Emitters

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