4.8 Article

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

Related references

Note: Only part of the references are listed.
Article Chemistry, Multidisciplinary

Managing Locally Excited and Charge-Transfer Triplet States to Facilitate Up-Conversion in Red TADF Emitters That Are Available for Both Vacuum- and Solution-Processes

Jia-Xiong Chen et al.

Summary: Developing red thermally activated delayed fluorescence (TADF) emitters for high-performance OLEDs is a challenge, but the newly designed and synthesized red TADF emitters in this study show promising results with significant efficiency enhancements. Among them, oDTBPZ-DPXZ demonstrates efficient TADF feature and high exciton utilization, achieving excellent external quantum efficiency in both vacuum-processed and solution-processed OLEDs. This work provides an effective strategy for designing red TADF molecules by managing energy level alignments to enhance exciton harvesting.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

Solution-processed multi-resonance organic light-emitting diodes with high efficiency and narrowband emission

Shen Xu et al.

Summary: By extending aromatic rings and introducing tert-butyls, the solubility, efficiency, and emission color of multi resonance-thermally activated delayed fluorescence (MR-TADF) molecules can be enhanced. Consequently, high-efficiency MR-TADF solution-processed OLEDs with narrow FWHM of 32 nm and 16.3% external quantum efficiency were successfully fabricated.

CHINESE CHEMICAL LETTERS (2021)

Article Chemistry, Multidisciplinary

Chiral Spiro-Axis Induced Blue Thermally Activated Delayed Fluorescence Material for Efficient Circularly Polarized OLEDs with Low Efficiency Roll-Off

Yi-Pin Zhang et al.

Summary: This study achieved efficient circularly polarized OLEDs by introducing a spiral-axis skeleton and TADF molecules, demonstrating high efficiency and low efficiency roll-off.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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)

Article Chemistry, Multidisciplinary

Fast Delayed Emission in New Pyridazine-Based Compounds

Simonas Krotkus et al.

Summary: Three novel donor-acceptor molecules with the Pydz acceptor moiety were synthesized and characterized. Among them, dPXZMePydz exhibited high reverse intersystem crossing rate and fast thermally activated delayed fluorescence, while compounds with weaker donor units did not show these properties.

FRONTIERS IN CHEMISTRY (2021)

Article Chemistry, Physical

Revealing the role of 1,2,4-triazolate fragment of blue-emitting bis-tridentate Ir(III) phosphors: photophysical properties, photo-stabilities, and applications

Z. -L. Zhu et al.

Summary: Novel bis-tridentate Ir(III) complexes with 6-(1,2,4-triazolyl)-2-phenoxypyridine (tazPx) as chromophoric chelates show improved photostabilities and competitive performances in blue-emitting organic light-emitting diodes, with high quantum yields and shortened radiative lifetime compared to complexes using other chelates. Theoretical calculations reveal the significant contribution of the triazolate moiety to the radiative transition, leading to enhanced performance of the tazPx-based complex.

MATERIALS TODAY ENERGY (2021)

Review Chemistry, Multidisciplinary

Designs and Applications of Circularly Polarized Thermally Activated Delayed Fluorescence Molecules

Lucas Frederic et al.

Summary: The development of efficient CP-Organic Light-Emitting Diodes (CP-OLEDs) through the design of fluorophores merging circularly polarized (CP) luminescence and thermally activated delayed fluorescence (TADF) properties is a promising direction. This progress report provides an overview of molecular designs explored to obtain CP-TADF properties, their performance as chiral emitters in CP-OLEDs, and the future challenges in this emerging research field.

ADVANCED FUNCTIONAL MATERIALS (2021)

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)

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)

Article Chemistry, Multidisciplinary

Highly Efficient Electroluminescence from Narrowband Green Circularly Polarized Multiple Resonance Thermally Activated Delayed Fluorescence Enantiomers

Yincai Xu et al.

Summary: In this study, highly efficient organic light-emitting diodes that exhibit pure green emission and circularly polarized electroluminescence signal were developed by integrating circularly polarized luminescence and thermally activated delayed fluorescence emission induced by multiple resonance effect. This represents a significant advancement in the field of organic electronics.

ADVANCED MATERIALS (2021)

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)

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)

Article Chemistry, Multidisciplinary

Chiral Thermally Activated Delayed Fluorescence Materials Based on R/S-N2,N2′-Diphenyl-[1,1′-binaphthalene]-2,2′diamine Donor with Narrow Emission Spectra for Highly Efficient Circularly Polarized Electroluminescence

Zhi-Ping Yan et al.

Summary: Novel chiral TADF materials with high photoluminescence quantum efficiency and narrow emission spectra were prepared and showed promising performance in OLEDs, indicating potential for improving electroluminescence properties.

ADVANCED FUNCTIONAL MATERIALS (2021)

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)

Article Materials Science, Multidisciplinary

Facile synthesis of multi-resonance ultra-pure-green TADF emitters based on bridged diarylamine derivatives for efficient OLEDs with narrow emission

Guanting Liu et al.

Summary: The study developed two highly efficient green-emitting MR-TADF emitters, DMAc-BN and PXZ-BN, using a one-pot borylation method. These emitters exhibited high external quantum efficiencies and small full width at half maximum values in OLEDs. The design successfully addressed aggregation-induced quenching issues faced by MR-TADF emitters in the past.

JOURNAL OF MATERIALS CHEMISTRY C (2021)

Article Chemistry, Multidisciplinary

Integrating molecular rigidity and chirality into thermally activated delayed fluorescence emitters for highly efficient sky-blue and orange circularly polarized electroluminescence

Fan Ni et al.

Summary: By integrating high molecular rigidity and stable chirality, two pairs of D*-A type circularly polarized thermally activated delayed fluorescence (CP-TADF) emitters with an almost absolute quasi-equatorial conformer geometry and excellent photoluminescence quantum efficiencies (PLQYs) are developed, achieving state-of-the-art electroluminescence performance among blue and orange circularly polarized organic light-emitting diodes (CP-OLEDs).

MATERIALS HORIZONS (2021)

Article Chemistry, Multidisciplinary

Intramolecular Borylation via Sequential B-Mes Bond Cleavage for the Divergent Synthesis of B,N,B-Doped Benzo[4]helicenes

Julius A. Knoeller et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

Article Chemistry, Multidisciplinary

Axially Chiral TADF-Active Enantiomers Designed for Efficient Blue Circularly Polarized Electroluminescence

Meng Li et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

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)

Article Materials Science, Multidisciplinary

Improving Processability and Efficiency of Resonant TADF Emitters: A Design Strategy

David Hall et al.

ADVANCED OPTICAL MATERIALS (2020)

Article Chemistry, Multidisciplinary

Highly Emissive Dinuclear Platinum(III) Complexes

Xiugang Wu et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (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

Circularly Polarized Thermally Activated Delayed Fluorescence Emitters in Through-Space Charge Transfer on Asymmetric Spiro Skeletons

Sheng-Yi Yang et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (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 Chemistry, Multidisciplinary

The design of an extended multiple resonance TADF emitter based on a polycyclic amine/carbonyl system

Dianming Sun et al.

MATERIALS CHEMISTRY FRONTIERS (2020)

Review Chemistry, Multidisciplinary

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

Da-Wei Zhang et al.

CHEMICAL SOCIETY REVIEWS (2020)

Article Materials Science, Multidisciplinary

1,8-Naphthalimide-based circularly polarized TADF enantiomers as the emitters for efficient orange-red OLEDs

Yin-Feng Wang et al.

ORGANIC ELECTRONICS (2019)

Article Multidisciplinary Sciences

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

Anton Pershin et al.

NATURE COMMUNICATIONS (2019)

Article Nanoscience & Nanotechnology

Efficient Orange-Red Thermally Activated Delayed Fluorescence Emitters Feasible for Both Thermal Evaporation and Solution Process

Jia-Xiong Chen et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

Article Chemistry, Multidisciplinary

Multi-Resonance Induced Thermally Activated Delayed Fluorophores for Narrowband Green OLEDs

Yuewei Zhang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

Article Materials Science, Multidisciplinary

Thermally activated delayed fluorescence enantiomers for solution-processed circularly polarized electroluminescence

Sibing Sun et al.

JOURNAL OF MATERIALS CHEMISTRY C (2019)

Article Chemistry, Multidisciplinary

One-Shot Multiple Borylation toward BN-Doped Nanographenes

Kohei Matsui et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2018)

Article Chemistry, Multidisciplinary

Peripheral Amplification of Multi-Resonance Induced Thermally Activated Delayed Fluorescence for Highly Efficient OLEDs

Xiao Liang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2018)

Article Chemistry, Multidisciplinary

(Deep) blue through-space conjugated TADF emitters based on [2.2]paracyclophanes

Eduard Spuling et al.

CHEMICAL COMMUNICATIONS (2018)

Article Chemistry, Physical

Revisiting Dual Intramolecular Charge-Transfer Fluorescence of Phenothiazine-triphenyltriazine Derivatives

Deng-Gao Chen et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2018)

Article Chemistry, Multidisciplinary

Molecular Conformation-Dependent Mechanoluminescence: Same Mechanical Stimulus but Different Emissive Color over Time

Jie Yang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2018)

Article Chemistry, Physical

Computational Design of Thermally Activated Delayed Fluorescence Materials: The Challenges Ahead

Y. Olivier et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2018)

Article Chemistry, Multidisciplinary

Divergent Synthesis of Heteroatom-Centered 4,8,12-Triazatriangulenes

Soichiro Nakatsuka et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2017)

Review Chemistry, Physical

Molecular Design Strategy of Organic Thermally Activated Delayed Fluorescence Emitters

Yirang Im et al.

CHEMISTRY OF MATERIALS (2017)

Article Chemistry, Multidisciplinary

Design and Synthesis of New Circularly Polarized Thermally Activated Delayed Fluorescence Emitters

Sophie Feuillastre et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2016)

Article Chemistry, Multidisciplinary

A double hetero[4]helicene composed of two phenothiazines: synthesis, structural properties, and cationic states

Daisuke Sakamaki et al.

CHEMICAL COMMUNICATIONS (2015)

Article Chemistry, Multidisciplinary

Thermally activated delayed fluorescence with circularly polarized luminescence characteristics

Takuro Imagawa et al.

CHEMICAL COMMUNICATIONS (2015)

Article Chemistry, Multidisciplinary

Circularly polarized luminescence from bridged triarylamine helicenes

JE Field et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2003)