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Article
Chemistry, Multidisciplinary
Yincai Xu et al.
Summary: This article proposes a synthetic methodology for narrowband emission materials by functionalizing multiple resonance skeletons and generating a universal building block. By modulating the acceptor, a series of efficient narrowband green TADF emitters have been constructed. An organic light-emitting diode based on this strategy exhibits pure green emission and high quantum efficiency.
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Multidisciplinary
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)
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
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
Yuewei Zhang et al.
Summary: This study presents a strategy to achieve ultra-pure green emissions by suppressing shoulder peaks in the emission spectra of conventional polycyclic aromatic hydrocarbons (PAHs). By synthesizing multi-resonance fragments with conventional PAH, extended pi-conjugation lengths, increased molecular rigidity, and reduced vibrational frequency were simultaneously achieved. The proof-of-concept emitters showed excellent optical properties and have the potential for wide applications in organic optoelectronic devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yincai Xu et al.
Summary: In this study, a novel molecular construction paradigm based on multiple resonance was proposed for thermally activated delayed fluorescence (TADF) compounds. A representative multiple resonance polycyclic aromatic hydrocarbon (MR-PAH) was successfully synthesized using this method. The resulting compound exhibited excellent green emission performance in organic light-emitting diodes (OLEDs).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Environmental
Wei Yang et al.
Summary: Two new thermally activated delayed fluorescence (TADF) molecules were constructed by connecting novel rigid polycyclic phenazine-derived donors with oxygen-bridged boron acceptor. The resulting emitters exhibited fast reverse intersystem crossing rates and high photoluminescence quantum yields, leading to high-performance orange OLEDs with extremely low efficiency roll-off.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Wei Yang et al.
Summary: In this study, a new type of helicene-based enantiomers with inherent circularly polarized luminescence and narrow thermally activated delayed fluorescence characteristics were developed. By optimizing their thermal/photophysical/chiroptical properties, high-efficiency circularly polarized organic light-emitting diodes were achieved.
Article
Chemistry, Multidisciplinary
Zhi-Ping Yan et al.
Summary: The realization of luminescent materials with narrowband and circularly polarized luminescence is achieved through a dual-core strategy, resulting in enhanced transition oscillator strength and ultrapure blue emissions.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Susumu Oda et al.
Summary: A pure green MR-TADF material (nu-DABNA-CN-Me) with high k(RISC) of 10(5) s(-1) is reported, achieved by introducing cyano groups into a blue-emitting MR-TADF material (nu-DABNA). The organic light-emitting diode employing it as an emitter exhibits green emission with a small full-width at half-maximum and a high maximum EQE of 31.9%.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
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
Sheng-Yi Yang et al.
Summary: The pi-stacked thermally activated delayed fluorescence (TADF) material SDMAC exhibits multi-stimulus response properties, leading to efficient OLED manufacturing and various potential applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
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.
Article
Multidisciplinary Sciences
Junyuan Liu et al.
Summary: The authors successfully doped green-emitting molecules into organic light-emitting diodes using multiple resonance effect and multi-lock strategy, achieving a device with Broadcast Service Television 2020 color-gamut, 50% improved EQE, and high luminescence. The green emitters with high color saturation and potential applications for displays and imaging were linked through bonding and spiro-carbon bridges, resulting in the purest green molecules with comparable quantum efficiency.
NATURE COMMUNICATIONS
(2022)
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)
Review
Materials Science, Multidisciplinary
Rajendra Kumar Konidena et al.
Summary: The exploration of boron-based multiresonance thermally activated delayed fluorescence (MR-TADF) emitters has gained significant attention recently, as they hold the potential to advance organic light-emitting diodes (OLEDs). However, these emitters still face challenges such as achieving full-color emission and addressing efficiency roll-off. In this review, different design strategies for boron-based MR-TADF emitters are discussed, along with the challenges and opportunities in this field.
ADVANCED PHOTONICS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Ji-Kun Li et al.
Summary: This study presents unprecedented B,N-embedded double hetero[7]helicenes with excellent chiroptical properties, high absorption dissymmetry factors, and tunable circularly polarized luminescence, opening up new possibilities for the development of high-performance chiroptical materials in the future.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
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)
Review
Chemistry, Multidisciplinary
Francisco Tenopala-Carmona et al.
Summary: Horizontal orientation of the emissive transition dipole moment (TDM) in OLEDs can significantly improve light outcoupling efficiency. Determining the drivers of horizontal orientation, such as emitter molecule aspect ratio and glass-transition temperature (T-g), is crucial. While molecular weight and linearity are key parameters for neat systems, host T-g and emitter length and MW become more relevant in host-guest systems with low and high molecular weight emitters, respectively. Future research should aim to establish a comprehensive model of molecular orientation in OLEDs.
ADVANCED 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
Chemistry, Multidisciplinary
Subeesh Madayanad Suresh et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Chemistry, Multidisciplinary
Yuewei Zhang et al.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(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)
Article
Optics
Yasuhiro Kondo et al.
Review
Nanoscience & Nanotechnology
Yuchao Liu et al.
NATURE REVIEWS MATERIALS
(2018)
Article
Nanoscience & Nanotechnology
Dongdong Zhang et al.
ACS APPLIED MATERIALS & INTERFACES
(2017)
Review
Chemistry, Multidisciplinary
Zhiyong Yang et al.
CHEMICAL SOCIETY REVIEWS
(2017)
Review
Chemistry, Multidisciplinary
Ye Tao et al.
ADVANCED MATERIALS
(2014)
Article
Multidisciplinary Sciences
Hiroki Uoyama et al.
