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Article
Optics
Xiao-Chun Fan et al.
Summary: Researchers have developed a new ultrapure green emitter called DBTN-2, which greatly improves the efficiency and color purity of OLED technology. The unique molecular design of this material reduces relaxation energy between excited and ground states and enhances spin-orbit couplings, resulting in highly efficient operation. These advancements make DBTN-2 a promising candidate for commercial green OLED displays.
Article
Nanoscience & Nanotechnology
Jie Yan et al.
Summary: In this study, we synthesized different blue emitting homoleptic iridium(III) phosphors with specific cyclometalates. These iridium complexes displayed intense phosphorescence in the solution state and were able to transfer energy to multiresonance thermally activated delayed fluorescence (MR-TADF) terminal emitters via Fo''rster resonance energy transfer (FRET). OLEDs using these phosphors achieved true blue, narrow bandwidth emission with high efficiency. The research also analyzed the kinetic parameters involved in energy transfer processes and proposed ways to improve efficiency roll-off.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Xuan Zeng et al.
Summary: Green multiresonance (MR) emitters with narrow full widths at half maximum (FWHMs) of 13 nm and 14 nm have been synthesized by fusing indolo(3,2,1-jk)carbazole and naphthalene moieties. These emitters exhibit high photoluminescence quantum yields (>95%) and have the smallest FWHMs among all green MR emitters. The molecular architecture with extended conjugation length and small FWHM is achieved by orbital interactions between antisymmetric segments.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qingyang Wang et al.
Summary: Developing high-efficiency narrowband organic electroluminescent materials for ultrahigh-definition displays with wide color gamut is strategically important. This study presents a synthetic methodology for functionalizing brominated B-N-containing multiple-resonance frameworks to achieve green emission in organic light-emitting diodes. The outstanding performance of this approach is attributed to the perfect integration of the MR framework and the donor-acceptor configuration.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yuewei Zhang et al.
Summary: A novel multiple fusion molecular design strategy is proposed to break the trade-off between effective spectral redshift and small FWHM value in ideal narrowband yellow MR emitters. The proof-of-the-concept emitters show bright yellowish green to yellow emissions with extremely small FWHMs. In addition, the corresponding electroluminescent device based on the novel design exhibits excellent efficiencies and represents the best performance for yellow MR organic light-emitting diodes.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Subeesh Madayanad Suresh et al.
Summary: NOBNacene is a rare example of a p- and n-doped nonacene compound with linearly extended ladder-type multiresonant thermally activated delayed fluorescence (MR-TADF) emission. It exhibits efficient narrow deep blue emission with a PL wavelength of 410 nm, FWHM of 38 nm, PL quantum yield of 71%, and delayed lifetime of 1.18 ms. The OLED using NOBNacene as the emitter shows a comparable electroluminescence spectrum with a peak at 409 nm and a maximum external quantum efficiency (EQE(max)) of 8.5% at CIE coordinates of (0.173, 0.055). The EQE(max) is increased to 11.2% with 3 wt% doping of the emitter in the emissive layer, resulting in a slightly broadened electroluminescence spectrum with CIE coordinates of (0.176, 0.068).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
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
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
Chemistry, Multidisciplinary
Pengcheng Jiang et al.
Summary: This study introduces a highly emissive molecule with enhanced quenching resistance by segregating the planar MR-TADF skeleton using two bulky carbazolyl units, which significantly improves the performance of corresponding devices with a maximum external quantum efficiency of 40.0% and a full width at half maximum of 25 nm.
The steric effect of the bulky carbazolyl units largely removes the formation of detrimental excimers/aggregates, leading to an OLED example that can achieve narrow bandwidth and high EL efficiency surpassing 40% to date.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Kenkera Rayappa Naveen et al.
Summary: Developing boron-based emitters with a narrow band spectrum in the red region is crucial for optoelectronic applications. The newly designed emitters exhibit pure red emissions with high quantum yield and external quantum efficiency, showing promise for large-scale production.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
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
Ya-Kun Wang et al.
Summary: The issue of instability in mixed-halide perovskites (MHPs) has been addressed by introducing inorganic ligands, resulting in improved colloidal and photo-stability. The new materials exhibit high efficiency and narrow emission spectrum in light-emitting diodes (LEDs), with enhanced operating stability.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yang-Kun Qu et al.
Summary: In this study, we propose a method for constructing highly efficient MR-TADF emitters by introducing spiro-9,9'-bifluorene (SBF) units and adopting a mono-substituted design strategy. The results demonstrate that the SF1BN molecule exhibits high device efficiency and narrow-band emission, which is of significant importance for improving the performance of MR-TADF devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Multidisciplinary
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)
Article
Optics
Tingtao Meng et al.
Summary: The demonstration of high-resolution quantum-dot light-emitting diodes using transfer printing and Langmuir-Blodgett film technology has been achieved. A honeycomb-patterned layer of wide-bandgap quantum dots is embedded to reduce leakage current, and both red and green QLEDs are demonstrated. The red devices exhibit high brightness and peak external quantum efficiency.
Review
Chemistry, Multidisciplinary
Cheng Chen et al.
Summary: This review provides an overview of research on BN-heteroarenes, focusing on the synthesis, properties, and potential applications of 1,4-azaborine-based compounds. It highlights their value beyond multiresonant thermally activated delayed fluorescence (MR-TADF) materials and aims to stimulate collaboration between chemists and materials scientists in related fields.
Article
Chemistry, Multidisciplinary
Xiaosong Cao et al.
Summary: In this study, a MR-TADF compound (BN-Se) with efficient spin-flip transition, fast radiative decay, close-to-unity quantum yield, and narrowband emission was reported. The compound showed excellent performance in OLEDs and as a photosensitizer, highlighting its potential beyond OLED applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yinuo Wang et al.
Summary: Two novel boron, sulfur, nitrogen-doped polycyclic aromatic hydrocarbon multiple resonance emitters were designed and synthesized for narrowband red emission. The structures of these emitters allow for high photoluminescent quantum efficiency and rapid reverse intersystem crossing, resulting in red electroluminescence with high external quantum efficiency.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Siyuan Cai et al.
Summary: This study improves the triplet exciton harvesting efficiency of thermally activated delayed fluorescent materials through a coordination strategy using metal-organic compounds, resulting in higher emission rates and quantum yields. Additionally, the fabricated ultrapure-green OLEDs exhibit high brightness and external quantum efficiencies, as well as low roll-offs and long device lifetimes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Xu-Feng Luo et al.
Summary: This study reports two multiple-resonance thermally activated delayed fluorescence emitters based on specific units and skeletons with high-efficiency emission characteristics. The corresponding organic light-emitting diodes demonstrate high external quantum efficiencies and pure green emission.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Ying-Chun Cheng et al.
Summary: Fusing carbazoles to MR core structure can change the emission colors of MR-TADF materials, achieving high efficiency emission in OLEDs and providing a new approach for tuning emission colors of MR-TADF emitters.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Environmental
Dong Jin Shin et al.
Summary: A highly efficient deep-red hyperfluorescence device with long device lifetime and high external quantum efficiency was fabricated by adopting a newly designed 12BTCzTPN thermally activated delayed fluorescence (TADF) assistant dopant.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Mingyuan Xie et al.
Summary: This study presents a solution to achieve high-efficiency pure-red perovskite light-emitting diodes (PeLEDs) by stabilizing the structure of quantum dots and reducing adverse effects. The use of composite ligands helped stabilize the strong-confined quantum dots and suppress Auger recombination in the devices. Additionally, adjustments in the valence band of the quantum dots improved charge injection balance in the PeLEDs.
Article
Optics
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.
Review
Materials Science, Multidisciplinary
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
Eungdo Kim et al.
Summary: A phosphor-sensitized TADF emission system with peripheral carbazole moieties has been developed, which achieved high efficiency and long operational lifetime. By enhancing the resonant energy transfer rate and reducing the triplet exciton density, the emitter showed an operational lifetime 6.6 times longer than conventional TADF emitters.
Review
Chemistry, Multidisciplinary
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
Multidisciplinary Sciences
Yasser Hassan et al.
Summary: By utilizing multidentate ligands to treat mixed-halide perovskite nanocrystals, efficient and color-stable red electroluminescence with a wavelength centered at 620 nanometers and an external quantum efficiency of 20.3% has been achieved. The key function of the ligand treatment is to 'clean' the nanocrystal surface by removing lead atoms, which suppresses the formation of iodine Frenkel defects and halide segregation. This work demonstrates the sensitivity of metal halide perovskites to surface properties and provides a pathway to control surface defect formation and migration, crucial for achieving bandgap stability for light emission and potentially impacting other optoelectronic applications.
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Multidisciplinary
Lisi Zhan et al.
Summary: A novel carbene-Cu(I)-amide complex, (MAC*)Cu(Cz), has been demonstrated as a promising TADF sensitizer for OLEDs, achieving high efficiencies, low efficiency roll-off, and long operational lifetimes. The use of this sensitizer also led to breakthroughs in high-efficiency yellow-emitting OLEDs, showcasing the potential for practical applications of TADF sensitized OLEDs.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Multidisciplinary
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)
Article
Engineering, Electrical & Electronic
En-Lin Hsiang et al.
Summary: This review article provides a comprehensive overview of the LCD, OLED, and LED display technologies through nine display performance indicators, comparing their advantages and disadvantages and discussing their future perspectives.
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
(2021)
Article
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Jun-Nan Yang et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
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Chemistry, Multidisciplinary
Yincai Xu et al.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Review
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Yuge Huang et al.
LIGHT-SCIENCE & APPLICATIONS
(2020)
Article
Chemistry, Multidisciplinary
Minlang Yang et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Multidisciplinary Sciences
Anton Pershin et al.
NATURE COMMUNICATIONS
(2019)
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Yasuhiro Kondo et al.
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In Seob Park et al.
ADVANCED FUNCTIONAL MATERIALS
(2018)
Review
Nanoscience & Nanotechnology
Yuchao Liu et al.
NATURE REVIEWS MATERIALS
(2018)
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(2014)
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Do Han Kim et al.
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C Féry et al.
APPLIED PHYSICS LETTERS
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