4.8 Article

Boron-Dipyrromethene-Based Fluorescent Emitters Enable High-Performance Narrowband Red Organic Light-Emitting Diodes

Related references

Note: Only part of the references are listed.
Article Nanoscience & Nanotechnology

Full-Color Sterically Shielded Boron Difluoride Emitters with Efficient and Ultrapure Electroluminescence via Sensitized Fluorescence

Tianyu Huang et al.

Summary: Researchers have engineered a family of full-color BF emitters with high photoluminescence quantum yields and narrow peaks. These emitters overcome challenges in recycling triplet excitons and achieve full-color emissions spanning the visible spectra.

ACS APPLIED MATERIALS & INTERFACES (2023)

Article Chemistry, Multidisciplinary

High-Efficiency Narrowband Multi-Resonance Emitter Fusing Indolocarbazole Donors for BT. 2020 Red Electroluminescence and Ultralong Operation Lifetime

Tianjiao Fan et al.

Summary: A narrowband pure-red multi-resonance emitter is reported by incorporating indolocarbazole segments into a boron/oxygen-embedded skeleton, achieving BT.2020 red electroluminescence for the first time with high efficiency and ultralong lifetime.

ADVANCED MATERIALS (2023)

Article Chemistry, Multidisciplinary

A Simple Molecular Design Strategy for Pure-Red Multiple Resonance Emitters

Haowen Chen et al.

Summary: Although there is a wide range of materials with multiple resonance (MR) in blue to green regions, literature on red-emissive MR emitters is scarce, which needs to be addressed for further applications. In this study, we propose a simple molecular design strategy for constructing pure-red MR emitters through conjugate charge transfer, resulting in a significant redshift of more than 128 nm compared to the selected parent MR core. The proof-of-concept emitter PPZ-BN exhibited a pure-red emission with high efficiency and excellent stability.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2023)

Article Chemistry, Multidisciplinary

Triphenylamine-Functionalized Multiple-Resonance TADF Emitters with Accelerated Reverse Intersystem Crossing and Aggregation-Induced Emission Enhancement for Narrowband OLEDs

Guowei Chen et al.

Summary: In this study, two efficient narrowband MR-TADF emitters, BNCz-pTPA and BNCz-mTPA, are developed by attaching electron-rich triphenylamine (TPA) with twisted spatial conformation to the MR framework. The TPA substituent endows the new emitters with aggregation-induced emission enhancement (AIEE) for ACQ suppression. This study may provide a simple but effective approach to constructing high-performance emitters for wide-color-gamut OLED displays.

ADVANCED FUNCTIONAL MATERIALS (2023)

Article Chemistry, Multidisciplinary

Medium-Ring Strategy Enables Multiple Resonance Emitters with Twisted Geometry and Fast Spin-Flip to Suppress Efficiency Roll-Off

Bowen Lei et al.

Summary: We propose a medium-ring strategy to design efficient multi-resonance (MR) emitters with heptagonal TBA donors, which suppress aggregation-caused quenching (ACQ) effect and accelerate reverse intersystem crossing (RISC) process. This strategy results in the first blue MR emitter with radiative decay rate as fast as 10(8) s(-1) and RISC rate as fast as 10(6) s(-1). The DTBA-B2N3 emitter enables high-performance blue OLEDs with a maximum external quantum efficiency (EQE(max)) of 30.9% and alleviated efficiency roll-off (EQE(1000): 20.5%).

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2023)

Article Chemistry, Multidisciplinary

Solution-Processable Pure-Red Multiple Resonance-induced Thermally Activated Delayed Fluorescence Emitter for Organic Light-Emitting Diode with External Quantum Efficiency over 20 %

Xinliang Cai et al.

Summary: A solution-processable red OLED with high purity and efficiency was developed by introducing auxiliary donor and acceptor moieties into the HOMO and LUMO positions of the MR-TADF system. The molecule BN-R exhibited a narrowband pure-red emission at 624 nm, with a high luminous efficiency of 94% and a narrow bandwidth of 46 nm. The solution-processable pure-red OLED based on BN-R showed a state-of-the-art external quantum efficiency over 20% and a long operational lifetime of 1088 hours at an initial luminance of 1000 cd m(-2), with Commission Internationale de I'eclairage coordinates of (0.663, 0.337).

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2023)

Article Materials Science, Multidisciplinary

Managing Intersegmental Charge-Transfer and Multiple Resonance Alignments of D3-A Typed TADF Emitters for Red OLEDs with Improved Efficiency and Color Purity

Xiao-Chun Fan et al.

Summary: This research highlights the challenges in developing MR-TADF emitters that maintain high color purity in the red region, and emphasizes the importance of excited state alignments of MR-based donor-acceptor molecules in determining their preferring characteristics. By using the newly designed MR-based D-A molecule mBDPA-TOAT, high external quantum efficiency and color purity are achieved.

ADVANCED OPTICAL MATERIALS (2022)

Article Chemistry, Multidisciplinary

High-Performance Narrowband Pure-Red OLEDs with External Quantum Efficiencies up to 36.1% and Ultralow Efficiency Roll-Off

Yang Zou et al.

Summary: The development of novel red MR emitters has solved the issue of high-color-purity blue and green OLEDs. These emitters exhibit excellent photophysical properties and allow for fine-tuning of the emission spectra, making them suitable for pure red OLEDs. In experiments, pure red OLEDs demonstrate outstanding device performances.

ADVANCED MATERIALS (2022)

Article Chemistry, Multidisciplinary

Intramolecular C-H Activation as an Easy Toolbox to Synthesize Pyridine-Fused Bipolar Hosts for Blue Organic Light-Emitting Diodes

Fei Wang et al.

Summary: This study presents a new method to obtain structurally diverse benzoheteroaromatic-fused pyridine skeletons, which provides a platform for the synthesis of various pyridine-fused bipolar host materials. The incorporation of pyridine fragment leads to strong intermolecular interactions and satisfactory bipolar transporting properties. The study also demonstrates the potential of benzoheteroaromatic-fused pyridine skeletons in constructing high-performance blue OLEDs.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

Article Chemistry, Multidisciplinary

Mesityl-Functionalized Multi-Resonance Organoboron Delayed Fluorescent Frameworks with Wide-Range Color Tunability for Narrowband OLEDs

Xiang Wang et al.

Summary: This study reports a binary-doped skeleton that can generate multi-resonance emitters with wide-range color tunability. The borylation method developed in this research allows for deep blue to pure green emitters with high external quantum efficiency and color purity.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

Article Chemistry, Multidisciplinary

Highly Efficient Green and Red Narrowband Emissive Organic Light-Emitting Diodes Employing Multi-Resonant Thermally Activated Delayed Fluorescence Emitters

Sen Wu et al.

Summary: In this study, we demonstrate the method of improving OLED performance by carefully selecting the donor. By decorating the DiKTa core with TPA and DPA, we achieved bright and narrowband green and red emission, respectively. The OLEDs based on these emitters showed outstanding performance with the highest external quantum efficiencies.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

Article Chemistry, Multidisciplinary

Space-Confined Donor-Acceptor Strategy Enables Fast Spin-Flip of Multiple Resonance Emitters for Suppressing Efficiency Roll-Off

Yang Liu et al.

Summary: The space-confined donor-acceptor strategy is proposed to accelerate the reverse intersystem crossing rate (k(RISC)) in multi-resonance boron-nitrogen-containing thermally activated delayed fluorescence (MR-TADF) emitters, resulting in improved device efficiency and alleviated efficiency roll-off.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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)

Review Materials Science, Multidisciplinary

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Hyung Jong Kim et al.

Summary: Organic thermally activated delayed fluorescence (TADF) materials have attracted research interest for their efficient excitonic utilization in OLEDs. The broad emission spectra of these materials have limited their application in ultrahigh-definition OLED displays. Recently, a new type of TADF material called MR-TADF materials, based on heteroatom-doped polycyclic aromatic frameworks, has gained attention for its efficient narrowband emissions.

ADVANCED OPTICAL MATERIALS (2022)

Article Multidisciplinary Sciences

Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs)

Rongchuan Su et al.

Summary: Efficient TADF materials and high-performance TSF-OLEDs are achieved through the design of a new triazolotriazine (TAZTRZ) acceptor. The enhanced electron-withdrawing ability and increased planarity of the TAZTRZ acceptor result in a small singlet-triplet energy gap, high efficiency, and low efficiency roll-off in the TSF-OLEDs.

SCIENCE BULLETIN (2021)

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)

Article Chemistry, Physical

High-Efficiency Red-Fluorescent Organic Light-Emitting Diodes with Excellent Color Purity

Zhiyi Li et al.

Summary: A rational strategy was reported to construct a highly efficient TADF-sensitized fluorescent OLED system through the dedicated selection of the host and the TADF sensitizer, achieving a maximum EQE of 16.9%. A new factor, the sensitization efficiency (SE), was introduced to quantitatively evaluate the contribution of the fluorescent emission, with reported OLEDs achieving a high SE up to 96.4% and CIE coordinates close to standard red coordinates. This discussion will aid in the design and evaluation of more efficient TADF-sensitized fluorescent OLEDs.

JOURNAL OF PHYSICAL CHEMISTRY C (2021)

Article Optics

Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission

Chin-Yiu Chan et al.

Summary: This study presents pure-blue OLEDs with high efficiency, narrow emission, and good stability, showing promise for display applications. The design is based on a two-unit stacked tandem hyperfluorescence OLED with strict control of device fabrication and procedures to further improve device lifetimes.

NATURE PHOTONICS (2021)

Article Optics

High-efficiency, long-lifetime deep-blue organic light-emitting diodes

Soon Ok Jeon et al.

Summary: By combining a new design of blue TADF materials with a triplet-exciton recycling protocol, high efficiency and long lifetime were achieved in deep-blue organic light-emitting diodes.

NATURE PHOTONICS (2021)

Article Nanoscience & Nanotechnology

A New BODIPY Material for Pure Color and Long Lifetime Red Hyperfluorescence Organic Light-Emitting Diode

Young Hun Jung et al.

Summary: A red fluorescent material, 1,3,7,9-tetrakis(4-(tert-butyl)-phenyl)-5,5-difluoro-10-(2-methoxyphenyl)-5H-4l4,5l4-dipyrrolo[1,2-c:2',1'-f][1,3,2]diazaborinine (4tBuMB), was utilized as an emitting dopant in a thermally activated delayed fluorescence (TADF) sensitized hyperfluorescence organic light-emitting diode (HFOLED), demonstrating high photoluminescence quantum yield and device stability. The performance of the HFOLED device with 4tBuMB and 4CzTPN as the sensitizing host outperformed that with 4CzIPN, attributed to higher Forster resonance energy transfer rate and improved device lifetime.

ACS APPLIED MATERIALS & INTERFACES (2021)

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)

Review Materials Science, Multidisciplinary

Recent advances in organic luminescent materials with narrowband emission

Jung Min Ha et al.

Summary: The International Telecommunication Union introduced a new color gamut standard for broadcast television in 2012, requiring OLED emitters with narrowband R-G-B emissions to improve color purity. This review summarizes recent advances in OLED materials with narrowband emission and discusses the correlation between molecular structures, optical properties, and device characteristics.

NPG ASIA MATERIALS (2021)

Article Chemistry, Multidisciplinary

Achieving Narrow FWHM and High EQE Over 38% in Blue OLEDs Using Rigid Heteroatom-Based Deep Blue TADF Sensitized Host

Ramanaskanda Braveenth et al.

Summary: By designing and synthesizing two new deep blue TADF materials, deep blue emission and high efficiency have been achieved in OLED devices. The deep blue TADF emitters exhibit outstanding external quantum efficiency and high photoluminescence quantum yields.

ADVANCED FUNCTIONAL MATERIALS (2021)

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)

Article Chemistry, Multidisciplinary

A methyl-shield strategy enables efficient blue thermally activated delayed fluorescence hosts for high-performance fluorescent OLEDs

You Ran et al.

Summary: A novel methyl-shield strategy was utilized to design ideal TADF hosts for the enhancement of TSF-OLED performance, leading to a record-high EQE of 32.3%. This approach represents the first report of an EQE above 30% in TSF-OLEDs.

MATERIALS HORIZONS (2021)

Article Chemistry, Multidisciplinary

C-H activation based Copper-Catalyzed One-Shot Synthesis of N,O-Bidentate Organic Difluoroboron Complexes

Guangying Tan et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

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)

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)

Article Materials Science, Multidisciplinary

Recent advances in quantum dot-based light-emitting devices: Challenges and possible solutions

Zhiwen Yang et al.

MATERIALS TODAY (2019)

Article Chemistry, Multidisciplinary

Silver-mediated direct C-H amination of BODIPYs for screening endoplasmic reticulum-targeting reagents

Huaxing Zhang et al.

CHEMICAL COMMUNICATIONS (2018)

Article Multidisciplinary Sciences

High-efficiency organic light-emitting diodes with fluorescent emitters

Hajime Nakanotani et al.

NATURE COMMUNICATIONS (2014)

Article Chemistry, Multidisciplinary

Regiospecific N-Heteroarylation of Amidines for Full-Color-Tunable Boron Difluoride Dyes with Mechanochromic Luminescence

Dongbing Zhao et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2013)

Article Chemistry, Multidisciplinary

Doping-induced charge trapping in organic light-emitting devices

F Nüesch et al.

ADVANCED FUNCTIONAL MATERIALS (2005)