High-efficiency and low roll-off deep-blue OLEDs enabled by thermally activated delayed fluorescence emitter with preferred horizontal dipole orientation

Article Engineering, Environmental

Orange-red organic light emitting diodes with high efficiency and low efficiency roll-off: boosted by a fused acceptor composed of pyrazine and maleimide

Yanmei Hu et al.

Summary: Two efficient orange-red TADF emitters, T-DMAC-PPyM and P-DMAC-BPyM, were designed and synthesized, with P-DMAC-BPyM showing outstanding electroluminescent performance among the best results for orange-red TADF OLEDs.

CHEMICAL ENGINEERING JOURNAL (2022)

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Article Engineering, Environmental

High efficiency and extremely low roll-off solution- and vacuum-processed OLEDs based on isophthalonitrile blue TADF emitter

Gediminas Kreiza et al.

Summary: This study addresses the issue of efficiency roll-off in organic light-emitting diodes (OLEDs) using isophthalonitrile-based blue Thermally Activated Delayed Fluorescence (TADF) emitters. By introducing enlarged steric hindrance through methylation and reducing the singlet-triplet energy gap, the modified compound showed improved reverse intersystem crossing rate and shortened delayed fluorescence lifetime. The resulting blue OLED exhibited high efficiency and low efficiency roll-off, demonstrating the potential of isophthalonitrile-based TADF emitters in high-brightness OLED applications.

CHEMICAL ENGINEERING JOURNAL (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 Engineering, Environmental

High-efficiency red thermally activated delayed fluorescence emitters based on benzothiophene-fused spiro-acridine donor

Xu Gong et al.

Summary: By designing rigid and strong electron-rich donor moieties, researchers synthesized two red emitters with high rigidity and linear D-A molecular skeleton, showing distinct TADF nature and high efficiencies. The resulting OLEDs achieved high external quantum efficiency and excellent emission characteristics in the red color gamut.

CHEMICAL ENGINEERING JOURNAL (2021)

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News Item Optics

TADF sensitization targets deep-blue

Dongdong Zhang et al.

Summary: Two independent studies utilizing the same narrowband deep-blue emitter, nu-DABNA, but employing different energy transfer schemes, have both achieved efficient and stable deep-blue electroluminescence.

NATURE PHOTONICS (2021)

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Article Chemistry, Multidisciplinary

Acceptor-Donor-Acceptor-Type Orange-Red Thermally Activated Delayed Fluorescence Materials Realizing External Quantum Efficiency Over 30% with Low Efficiency Roll-Off

Durai Karthik et al.

Summary: Two new orange-red TADF materials, PzTDBA and PzDBA, exhibit high efficiency, low roll-off, and long lifetime. These materials are designed based on the A-D-A molecular configuration, which contributes to their good electronic properties.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Optimizing Charge Transfer and Out-Coupling of A Quasi-Planar Deep-Red TADF Emitter: towards Rec.2020 Gamut and External Quantum Efficiency beyond 30 %

Zhe Li et al.

Summary: This study reports a deep-red TADF emitter pCNQ-TPA with excellent optical properties and emission performance, which can be applied in display technologies.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Materials Science, Multidisciplinary

High-Efficiency Thermally Activated Delayed Fluorescence Emitters with High Horizontal Orientation and Narrow Deep-Blue Emission

Youngnam Lee et al.

Summary: The reported emitters OBOtSAc and tBuOBOtSAc show deep-blue emission with narrow full width at half maximum values, high photoluminescence quantum yields, and excellent horizontal emitting dipole orientations, leading to efficient OLED devices with high external quantum efficiencies.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Thermally Activated Delayed Fluorescence Warm White Organic Light Emitting Devices with External Quantum Efficiencies Over 30%

Jia-Xiong Chen et al.

Summary: A high-performance all-TADF single-emitting-layer WOLEDs has been achieved by utilizing a simple system based on two color-complementary TADF emitters. The design optimizes energy transfer and triplet-to-singlet conversion to achieve full exciton utilization and color balance, leading to a maximum EQE of 32.8% which surpasses previous reports based on both TADF and phosphorescence.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Triarylamine-Pyridine-Carbonitriles for Organic Light-Emitting Devices with EQE Nearly 40%

Yi-Kuan Chen et al.

Summary: The TPAmPPC compound is a highly efficient TADF material with excellent optical properties, demonstrating high photoluminescence quantum yields and superior device performance in OLEDs.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Tetrabenzo[a,c]phenazine Backbone for Highly Efficient Orange-Red Thermally Activated Delayed Fluorescence with Completely Horizontal Molecular Orientation

Umamahesh Balijapalli et al.

Summary: Three TADF molecules PQ1, PQ2, and PQ3, featuring planar acceptor manipulation and high steric hindrance, exhibit high molecular rigidity that suppresses nonradiative decay of excitons, leading to improved photoluminescence quantum yields. PQ3, with well-aligned excited states, enhances reverse intersystem crossing rate constant and displays a high external EL quantum efficiency in the orange-red OLED.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Materials Science, Multidisciplinary

High-Performance Nondoped Organic Light-Emitting Diode Based on a Thermally Activated Delayed Fluorescence Emitter with 1D Intermolecular Hydrogen Bonding Interactions

Yi-Zhong Shi et al.

Summary: Utilizing intermolecular hydrogen bonding to construct a 1D molecular chain effectively suppresses triplet-related exciton quenching and improves carrier mobility balance and optical out-coupling in OLEDs. OLEDs using DPmP-PXZ as a dopant emitter can maintain high external quantum efficiencies (EQEs) of over 20%.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

An unsymmetrical thermally activated delayed fluorescence emitter enables orange-red electroluminescence with 31.7% external quantum efficiency

Xuan Zeng et al.

Summary: A novel A-D-A' type TADF emitter TRZ-SBA-NAI was developed, displaying dual emission in solution with a dominant orange-red emission and an anti-Kasha's rule sky-blue emission shoulder. The doped TRZ-SBA-NAI showed only orange-red emission with a high photoluminescence quantum yield of 87%, and achieved a record-high external quantum efficiency of 31.7% with an electroluminescence peak at 593 nm.

MATERIALS HORIZONS (2021)

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Article Materials Science, Multidisciplinary

A 9-fluorenyl substitution strategy for aromatic-imide-based TADF emitters towards efficient and stable sky blue OLEDs with nearly 30% external quantum efficiency

Quanyou Feng et al.

Summary: The study demonstrates that the 9-phenyl-9-fluorenyl substituent is superior to the tert-butyl group in constructing TADF emitters for efficient and stable blue OLEDs. OLEDs based on molecules containing 9-phenyl-9-fluorenyl substituents exhibit excellent EL performance and stability in blue OLEDs, outperforming devices with tert-butyl substituted emitters.

MATERIALS ADVANCES (2021)

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Article Chemistry, Multidisciplinary

Highly efficient red thermally activated delayed fluorescence emitters by manipulating the molecular horizontal orientation

Changjiang Zhou et al.

Summary: This study designed and synthesized two red TADF emitters with horizontal orientation, among which PXZ-AQPhPy achieved a high external quantum efficiency of 19.6%, providing a simple and effective design strategy for selectively promoting the horizontal orientation of red TADF emitters.

MATERIALS CHEMISTRY FRONTIERS (2021)

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Article Materials Science, Multidisciplinary

Rational design of perfectly oriented thermally activated delayed fluorescence emitter for efficient red electroluminescence

Xuan Zeng et al.

Summary: This study successfully achieved active control of the dipole orientation of organic emitters by designing a linear TADF molecule, PhNAI-PMSBA, with an emitting dipole orientation ratio of 95%, substantially higher than traditional emitters. This unique feature is attributed to the inherently horizontal molecular orientation of the molecule and the good agreement between its transition dipole moment direction and molecular long axis.

SCIENCE CHINA-MATERIALS (2021)

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Article Chemistry, Multidisciplinary

A Red Thermally Activated Delayed Fluorescence Emitter Simultaneously Having High Photoluminescence Quantum Efficiency and Preferentially Horizontal Emitting Dipole Orientation

Xu Gong et al.

ADVANCED FUNCTIONAL MATERIALS (2020)

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Article Nanoscience & Nanotechnology

Rational Molecular Design of Highly Efficient Yellow-Red Thermally Activated Delayed Fluorescent Emitters: A Combined Effect of Auxiliary Fluorine and Rigidified Acceptor Unit

Shantaram Kothavale et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

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Article Chemistry, Multidisciplinary

Organic Light-Emitting Diodes: Pushing toward the Limits and Beyond

Jinouk Song et al.

ADVANCED MATERIALS (2020)

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Article Chemistry, Multidisciplinary

Highly Efficient Deep-Blue OLEDs using a TADF Emitter with a Narrow Emission Spectrum and High Horizontal Emitting Dipole Ratio

Hyoungcheol Lim et al.

ADVANCED MATERIALS (2020)

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Article Optics

Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states

Lin-Song Cui et al.

NATURE PHOTONICS (2020)

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Article Chemistry, Multidisciplinary

What Controls the Orientation of TADF Emitters?

Bilal A. Naqvi et al.

FRONTIERS IN CHEMISTRY (2020)

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Article Multidisciplinary Sciences

Acceptor plane expansion enhances horizontal orientation of thermally activated delayed fluorescence emitters

Yepeng Xiang et al.

SCIENCE ADVANCES (2020)

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Article Chemistry, Multidisciplinary

Highly Efficient Thermally Activated Delayed Fluorescence via an Unconjugated Donor-Acceptor System Realizing EQE of Over 30%

Chen-Chen Peng et al.

ADVANCED MATERIALS (2020)

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Article Chemistry, Multidisciplinary

Rotation-restricted thermally activated delayed fluorescence compounds for efficient solution-processed OLEDs with EQEs of up to 24.3% and small roll-off

Kuofei Li et al.

CHEMICAL COMMUNICATIONS (2020)

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Review Chemistry, Multidisciplinary

Recent advances in circularly polarized electroluminescence based on organic light-emitting diodes

Da-Wei Zhang et al.

CHEMICAL SOCIETY REVIEWS (2020)

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Article Chemistry, Multidisciplinary

Chiral Octahydro-Binaphthol Compound-Based Thermally Activated Delayed Fluorescence Materials for Circularly Polarized Electroluminescence with Superior EQE of 32.6% and Extremely Low Efficiency Roll-Off

Zheng-Guang Wu et al.

ADVANCED MATERIALS (2019)

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Review Chemistry, Multidisciplinary

Molecular Orientation Effects in Organic Light-Emitting Diodes

Tommaso Marcato et al.

HELVETICA CHIMICA ACTA (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 Chemistry, Multidisciplinary

Tri-Spiral Donor for High Efficiency and Versatile Blue Thermally Activated Delayed Fluorescence Materials

Wei Li et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

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Review Materials Science, Multidisciplinary

Blue organic light-emitting diodes: current status, challenges, and future outlook

Jiun-Haw Lee et al.

JOURNAL OF MATERIALS CHEMISTRY C (2019)

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Article Materials Science, Multidisciplinary

High-efficiency pure blue thermally activated delayed fluorescence emitters with a preferentially horizontal emitting dipole orientation via a spiro-linked double D-A molecular architecture

Xuan Zeng et al.

JOURNAL OF MATERIALS CHEMISTRY C (2019)

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Review Chemistry, Multidisciplinary

Origin and Control of Orientation of Phosphorescent and TADF Dyes for High-Efficiency OLEDs

Kwon-Hyeon Kim et al.

ADVANCED MATERIALS (2018)

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Article Chemistry, Multidisciplinary

Versatile Indolocarbazole-Isomer Derivatives as Highly Emissive Emitters and Ideal Hosts for Thermally Activated Delayed Fluorescent OLEDs with Alleviated Efficiency Roll-Off

Dongdong Zhang et al.

ADVANCED MATERIALS (2018)

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Article Materials Science, Multidisciplinary

Nearly 100% Horizontal Dipole Orientation and Upconversion Efficiency in Blue Thermally Activated Delayed Fluorescent Emitters

Sung Yong Byeon et al.

ADVANCED OPTICAL MATERIALS (2018)

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Article Materials Science, Multidisciplinary

To improve the efficiency of thermally activated delayed fluorescence OLEDs by controlling the horizontal orientation through optimizing stereoscopic and linear structures of indolocarbazole isomers

Songpo Xiang et al.

JOURNAL OF MATERIALS CHEMISTRY C (2018)

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Article Nanoscience & Nanotechnology

Simple Molecular-Engineering Approach for Enhancing Orientation and Outcoupling Efficiency of Thermally Activated Delayed Fluorescent Emitters without Red-Shifting Emission

Yi-Ting Lee et al.

ACS APPLIED MATERIALS & INTERFACES (2018)

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Article Chemistry, Multidisciplinary

Achieving Nearly 30% External Quantum Efficiency for Orange-Red Organic Light Emitting Diodes by Employing Thermally Activated Delayed Fluorescence Emitters Composed of 1,8-Naphthalimide-Acridine Hybrids

Weixuan Zeng et al.

ADVANCED MATERIALS (2018)

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Article Chemistry, Multidisciplinary

Versatile Molecular Functionalization for Inhibiting Concentration Quenching of Thermally Activated Delayed Fluorescence

Jiyoung Lee et al.

ADVANCED MATERIALS (2017)

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Article Chemistry, Multidisciplinary

New Molecular Design Concurrently Providing Superior Pure Blue, Thermally Activated Delayed Fluorescence and Optical Out-Coupling Efficiencies

P. Rajamalli et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2017)

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Article Chemistry, Physical

Horizontally Orientated Sticklike Emitters: Enhancement of Intrinsic Out-Coupling Factor and Electroluminescence Performance

Ming Liu et al.

CHEMISTRY OF MATERIALS (2017)

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Article Chemistry, Multidisciplinary

Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll-Off Fabricated from Aggregation-Induced Delayed Fluorescence Luminogens

Jian Huang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (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

Efficient and Tunable Thermally Activated Delayed Fluorescence Emitters Having Orientation-Adjustable CN-Substituted Pyridine and Pyrimidine Acceptor Units

Kuan-Chung Pan et al.

ADVANCED FUNCTIONAL MATERIALS (2016)

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Article Chemistry, Multidisciplinary

Sky-Blue Organic Light Emitting Diode with 37% External Quantum Efficiency Using Thermally Activated Delayed Fluorescence from Spiroacridine-Triazine Hybrid

Ting-An Lin et al.

ADVANCED MATERIALS (2016)

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Article Chemistry, Physical

Highly efficient blue electroluminescence based on thermally activated delayed fluorescence

Shuzo Hirata et al.

NATURE MATERIALS (2015)

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Article Chemistry, Multidisciplinary

Organic Light-Emitting Diodes with 30% External Quantum Efficiency Based on a Horizontally Oriented Emitter

Sei-Yong Kim et al.

ADVANCED FUNCTIONAL 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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Review Chemistry, Physical

Multifunctional Materials in High-Performance OLEDs: Challenges for Solid-State Lighting

Hisahiro Sasabe et al.

CHEMISTRY OF MATERIALS (2011)

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High-efficiency and low roll-off deep-blue OLEDs enabled by thermally activated delayed fluorescence emitter with preferred horizontal dipole orientation

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