Selenium-Doped Polycyclic Aromatic Hydrocarbon Multiresonance Emitters with Fast Reverse Intersystem Crossing for Narrowband Blue Emission

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, Multidisciplinary

Fabrication of Circularly Polarized MR-TADF Emitters with Asymmetrical Peripheral-Lock Enhancing Helical B/N-Doped Nanographenes

Xiugang Wu et al.

Summary: The study demonstrates an integrated system of circularly polarized thermally activated delayed fluorescence and multiple-resonance thermally activated delayed fluorescence, known as CPMR-TADF, which achieves high efficiency, color purity, and circularly polarized light through the strategic design and synthesis of asymmetric stereoisomers.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Highly Efficient Asymmetric Multiple Resonance Thermally Activated Delayed Fluorescence Emitter with EQE of 32.8 % and Extremely Low Efficiency Roll-Off

Futong Liu et al.

Summary: In this study, a novel asymmetric MRTADF emitter (2Cz-PTZ-BN) is designed with high PLQY and large k(RISC) values, enhancing the performance of pure green OLEDs. It maintains a high EQE even at high luminance, representing the highest value among reported green MR-TADF materials.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Chemistry, Multidisciplinary

Boron-, Sulfur- and Nitrogen-Doped Polycyclic Aromatic Hydrocarbon Multiple Resonance Emitters for Narrow-Band Blue Emission

Qiang Li et al.

Summary: Two boron-, sulfur-, and nitrogen-doped polycyclic aromatic hydrocarbon emitters with multiple resonance thermally activated delayed fluorescence were designed and synthesized. These emitters showed high photoluminescent quantum efficiency (88%) and rapid reverse intersystem crossing, enabling efficient narrow-band blue electroluminescence.

CHEMISTRY-A EUROPEAN JOURNAL (2022)

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Article Chemistry, Multidisciplinary

One-Shot Synthesis of Expanded Heterohelicene Exhibiting Narrowband Thermally Activated Delayed Fluorescence

Susumu Oda et al.

Summary: An expanded heterohelicene consisting of three BN2-embedded [4]helicene subunits has been successfully synthesized through one-shot triple borylation, resulting in a narrowband sky-blue thermally activated delayed fluorescence. The resonance effect of three boron and six nitrogen atoms minimized the singlet-triplet energy gap, enabling rapid reverse intersystem crossing with a high rate constant. The organic light-emitting diode device, used as an emitter, displayed a narrowband emission with a high external quantum efficiency.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Sulfone-Incorporated Multi-Resonance TADF Emitter for High-Performance Narrowband Blue OLEDs with EQE of 32%

Tao Hua et al.

Summary: In this study, three novel emitters were designed with gradually modified boron/nitrogen embedded polycyclic skeleton, achieving emission that shifted progressively towards blue wavelength. The incorporation of a sulfone unit provided a simple but effective tactic for narrowband blue emission. Devices based on these emitters exhibited high quantum efficiency and low efficiency roll-off.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Extending the π-Skeleton of Multi-Resonance TADF Materials towards High-Efficiency Narrowband Deep-Blue Emission

Xialei Lv et al.

Summary: In this study, the properties of multi-resonance TADF compounds were improved by extending the α-skeleton, resulting in higher efficiency and color purity. Among the compounds, BN3 achieved an external quantum efficiency of 37.6%, which is the highest reported efficiency for deep-blue TADF OLEDs.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Chemistry, Multidisciplinary

Ultrafast Triplet-Singlet Exciton Interconversion in Narrowband Blue Organoboron Emitters Doped with Heavy Chalcogens

In Seob Park et al.

Summary: Narrowband emissive organoboron emitters with multi-resonance effect are important for high-performance OLEDs. This study introduces the first MR organoboron emitter doped with a selenium atom, showing a record-high RISC rate and achieving high external electroluminescence quantum efficiency.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Chemistry, Multidisciplinary

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

Xinliang Cai et al.

Summary: In this study, a ternary boron-oxygen-nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR-TADF) properties, named DBNO, was developed. The designed molecule exhibits a vivid green emission with high photoluminescence quantum yield and an extremely narrow full width at half maximum. The organic light-emitting diode (OLED) based on DBNO shows significantly improved device performance with a narrowband green emission and high external quantum efficiency achieved through the TADF-sensitization mechanism.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Engineering, Environmental

The selective regulation of borylation site based on one-shot electrophilic C-H borylation reaction, achieving highly efficient narrowband organic light-emitting diodes

Yaxiong Wang et al.

Summary: This study reports two blue TADF emitters with narrow FWHM and provides a useful strategy for expanding the range of high-performance TADF materials by controlling the electrophilic borylation site of the reaction.

CHEMICAL ENGINEERING JOURNAL (2022)

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Article Materials Science, Multidisciplinary

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

Xu-Feng Luo et al.

Summary: This study demonstrates a simple strategy to achieve boron/nitrogen-based polycyclic heteroaromatic emitters with narrowband emission by tuning the coordination between B/N and heteroatom (O or S), resulting in improved photo-physical properties. These emitters show high external quantum efficiency in OLEDs and exhibit low-efficiency roll-off.

ADVANCED OPTICAL MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Emission and Absorption Tuning in TADF B,N-Doped Heptacenes: Toward Ideal-Blue Hyperfluorescent OLEDs

Kleitos Stavrou et al.

Summary: The study demonstrated color tuning of the MR-TADF B,N-heptacene core by controlling boron substituents, resulting in improved emission color coordinates and spectral overlap for blue hyperfluorescence OLEDs.

ADVANCED OPTICAL MATERIALS (2022)

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Article Optics

Efficient selenium-integrated TADF OLEDs with reduced roll-off

Yu Xuan Hu et al.

Summary: This study reports a heavy-atom incorporating emitter, BNSeSe, based on a selenium-integrated boron-nitrogen skeleton, which exhibits high photoluminescence quantum yield and fast reverse intersystem crossing rate. By utilizing BNSeSe, green OLEDs demonstrate high operational efficiency and significantly reduced efficiency roll-off at high brightness.

NATURE PHOTONICS (2022)

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Article Materials Science, Multidisciplinary

Purely Organic Emitters for Multiresonant Thermally Activated Delay Fluorescence: Design of Highly Efficient Sulfur and Selenium Derivatives

Saied Md Pratik et al.

Summary: Multiresonance thermally activated delayed fluorescence (MRTADF) emitters based on nitrogen-and/or oxygen-substituted organoboron molecules have attracted great interest for application in organic light-emitting diodes (OLEDs) due to their high photoluminescence quantum yields, color purity, and stability. This study expands the chemical range of MRTADF materials by considering the replacement of oxygen atoms with sulfur or selenium atoms, aiming to enhance spin-orbit coupling via the heavy-atom effect. Theoretical evaluation reveals that the chemical nature and positions of the chalcogen atoms significantly influence the emissive properties, making the molecules incorporating sulfur or selenium promising candidates for efficient deep-blue emitters.

ACS MATERIALS LETTERS (2022)

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Article Chemistry, Multidisciplinary

Highly Efficient Asymmetric Multiple Resonance Thermally Activated Delayed Fluorescence Emitter with EQE of 32.8% and Extremely Low Efficiency Roll-Off

Futong Liu et al.

Summary: MR-TADF emitters have potential for high color purity in OLEDs, but achieving high PLQY and k(RISC) simultaneously remains a challenge. The novel asymmetric MRTADF emitter designed in this study achieves high PLQY and fast k(RISC), boosting the performance of pure green devices without using sensitizing hosts.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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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

Narrowband Emission from Organic Fluorescent Emitters with Dominant Low-Frequency Vibronic Coupling

Xu Qiu et al.

Summary: A design strategy to achieve narrowband emission of organic fluorescent emitters is proposed by enhancing low-frequency vibronic coupling while reducing high-frequency ones. The designed QAO derivatives exhibit better performance with narrowest band emissions in toluene and doped devices.

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

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 Materials Science, Multidisciplinary

Thermally Activated Delayed Fluorescence Properties of Trioxoazatriangulene Derivatives Modified with Electron Donating Groups

Youichi Tsuchiya et al.

Summary: By modifying the donor substituents, a series of trioxoazatriangulene derivatives show emission colors ranging from green to orange with varying spectral widths, attributed to different charge-transfer transitions or multiple resonance effects.

ADVANCED OPTICAL MATERIALS (2021)

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Article Nanoscience & Nanotechnology

Charge Transfer as the Key Parameter Affecting the Color Purity of Thermally Activated Delayed Fluorescence Emitters

Ramin Ansari et al.

Summary: The emission bandwidth of thermally activated delayed fluorescence (TADF) is primarily determined by the charge transfer character of the molecule, rather than its propensity for rotational motion. Rational molecular design can result in organic emitters exhibiting sharp emission spectra.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Article Nanoscience & Nanotechnology

Asymmetric Blue Multiresonance TADF Emitters with a Narrow Emission Band

Jinho Park et al.

Summary: In this study, blue thermally activated delayed fluorescence (TADF) emitters with an asymmetric molecular structure were synthesized and characterized, achieving blue emission controlled by the aromatic units connected to nitrogen. The diphenylamine-based emitter showed deep-blue emission with high external quantum efficiency, while nitrogen-based emitters exhibited accelerated reverse intersystem crossing for high EQE.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Article Nanoscience & Nanotechnology

Approaching Efficient and Narrow RGB Electroluminescence from D-A-Type TADF Emitters Containing an Identical Multiple Resonance Backbone as the Acceptor

Feng Huang et al.

Summary: By combining traditional TADF and MR-TADF designs, it is possible to simultaneously achieve color tuning and narrowing of the spectral width of conventional TADF emission. This strategy selects a typical MR core as the backbone and attaches D segments of different electron donating abilities and numbers to achieve three different TADF emitters with emissions covering a range of colors.

ACS APPLIED MATERIALS & INTERFACES (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

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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Review Chemistry, Multidisciplinary

Recent Advances in Substituent Effects of Blue Thermally Activated Delayed Fluorescence Small Molecules

Tao Zhou et al.

Summary: TADF materials, as third-generation emitters for OLEDs, have gained widespread attention. They show high exciton utilization efficiency and offer a potential solution to enhance device performance. By adjusting factors such as donor and acceptor structures, substituents, and their positions, various properties of TADF molecules can be effectively controlled, providing references for the design of efficient and stable blue light emitters.

ACTA CHIMICA SINICA (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

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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Review Chemistry, Multidisciplinary

Multiresonant Thermally Activated Delayed Fluorescence Emitters Based on Heteroatom-Doped Nanographenes: Recent Advances and Prospects for Organic Light-Emitting Diodes

Subeesh Madayanad Suresh et al.

ADVANCED FUNCTIONAL MATERIALS (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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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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Article Chemistry, Physical

Highly efficient luminescence from space-confined charge-transfer emitters

Xun Tang et al.

NATURE MATERIALS (2020)

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Article Chemistry, Physical

Organic Resonance Materials: Molecular Design, Photophysical Properties, and Optoelectronic Applications

He Jiang et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (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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Review Materials Science, Multidisciplinary

Recent progress of narrowband TADF emitters and their applications in OLEDs

Jin-Ming Teng et al.

JOURNAL OF MATERIALS CHEMISTRY C (2020)

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Review Chemistry, Multidisciplinary

Degradation Mechanisms in Blue Organic Light-Emitting Diodes

Dan Wang et al.

CCS CHEMISTRY (2020)

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Article Multidisciplinary Sciences

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

Anton Pershin et al.

NATURE COMMUNICATIONS (2019)

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Article Optics

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

Yasuhiro Kondo et al.

NATURE PHOTONICS (2019)

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Article Chemistry, Organic

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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Article Materials Science, Multidisciplinary

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

Yi Yuan et al.

ADVANCED OPTICAL MATERIALS (2019)

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Article Nanoscience & Nanotechnology

Thermally Activated Delayed Fluorescence Carbonyl Derivatives for Organic Light-Emitting Diodes with Extremely Narrow Full Width at Half-Maximum

Xing Li et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

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Article Chemistry, Multidisciplinary

One-Shot Multiple Borylation toward BN-Doped Nanographenes

Kohei Matsui et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2018)

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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 Chemistry, Multidisciplinary

Shorter Exciton Lifetimes via an External Heavy-Atom Effect: Alleviating the Effects of Bimolecular Processes in Organic Light-Emitting Diodes

Markus Einzinger et al.

ADVANCED MATERIALS (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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Review Chemistry, Multidisciplinary

Recent advances in organic thermally activated delayed fluorescence materials

Zhiyong Yang et al.

CHEMICAL SOCIETY REVIEWS (2017)

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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)

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Editorial Material Engineering, Electrical & Electronic

Ultra-High-Definition Television (Rec. ITU-R BT.2020): A Generational Leap in the Evolution of Television

Masayuki Sugawara et al.

IEEE SIGNAL PROCESSING MAGAZINE (2014)

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Article Chemistry, Multidisciplinary

Efficiency Roll-Off in Organic Light-Emitting Diodes

Caroline Murawski et al.

ADVANCED MATERIALS (2013)

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Article Multidisciplinary Sciences

Highly efficient organic light-emitting diodes from delayed fluorescence

Hiroki Uoyama et al.

NATURE (2012)

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Article Chemistry, Physical

Effective method for the computation of optical spectra of large molecules at finite temperature including the Duschinsky and Herzberg-Teller effect:: The Qx band of porphyrin as a case study

Fabrizio Santoro et al.

JOURNAL OF CHEMICAL PHYSICS (2008)

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Selenium-Doped Polycyclic Aromatic Hydrocarbon Multiresonance Emitters with Fast Reverse Intersystem Crossing for Narrowband Blue Emission

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