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

Spuling, Eduard; Sharma, Nidhi; Samuel, Ifor D. W.; Zysman‐Colman, Eli; Bräse, Stefan

doi:10.1039/c8cc04594a

Cited by 128 publications

(115 citation statements)

References 36 publications

(9 reference statements)

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Section: Basic Design Strategies Of Three Tadf Molecular Systemsmentioning

confidence: 99%

“…Reproduced with permission from Ref [41a].C opyright 2016,Elsevier Ltd;( d) Exampleo fs piro-containingT ADF molecular design.Reproduced with permission from Ref[30].Copyright 2012, The Royal Society of Chemistry;(e), (f) Aseries of U-shaped TADF molecules with through-space charge transfer characteristics.Reproduced with permission from Ref[45].C opyright 2017, American Chemical Society; (g) Example of through-space induced TADF molecules. Reproduced with permissionfrom Ref[46].Copyright 2018,Royal SocietyofC hemistry.…”

mentioning

confidence: 99%

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Thermally Activated Delayed Fluorescence Materials: Towards Realization of High Efficiency through Strategic Small Molecular Design

Liang

Zheng

2019

Chemistry A European J

185

123

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Thermally activated delayed fluorescence (TADF) is one of the most intriguing and promising discoveries towards realization of highly‐efficient organic light emitting diodes (OLED) utilizing small molecules as emitters. It has the capability of manifesting all excitons generated during the electroluminescent processes, consequently achieving 100 % of internal quantum efficiency. Since the report of the first efficient OLED based on a TADF small molecule in 2012 by Adachi et al., the quest for optimal TADF materials for OLED application has never stopped. Various TADF molecules bearing different design concepts and strategies have been designed and produced, with the aim to boost the overall performances of corresponding OLEDs. In this minireview, the general principles of TADF molecular design based on three basic categories of TADF species: twisted intramolecular charge transfer (TICT), through‐space charge transfer (TSCT) and multi‐resonance induced TADF (MR‐TADF) are discussed in detail. Several key aspects with respect to each category, as well as some effective methods to enhance the efficiency of TADF materials and corresponding OLEDs from the molecular engineering perspectives, are summarized and discussed to exhibit a general landscape of TADF molecular design to a wide variety of scientific researchers within this particular disciplinary area.

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Section: Basic Design Strategies Of Three Tadf Molecular Systemsmentioning

confidence: 99%

mentioning

confidence: 99%

Thermally Activated Delayed Fluorescence Materials: Towards Realization of High Efficiency through Strategic Small Molecular Design

Liang

Zheng

2019

Chemistry A European J

185

123

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“…Besides this fundamental curiosity, PCP has received increasing attention for its wide applications as a planar chiral ligands in asymmetric synthesis, purely carbon and hydrogen based optical materials, molecular junctions and as a rigid backbone in light‐emitting diode TADF emitters …”

Section: Introductionmentioning

confidence: 99%

Preparation and Synthetic Applications of [2.2]Paracyclophane Trifluoroborates: An Efficient and Convenient Route to Nucleophilic [2.2]Paracyclophane Cross‐Coupling Building Blocks

et al. 2019

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We report the synthesis of [2.2]paracyclophane (PCP) trifluoroborate building blocks that can be used for the incorporation of the PCP moiety into a wide range of (hetero)aryl chlorides, bromides and triflates by a Pd(II)/RuPhos mediated Suzuki–Miyaura cross‐coupling reaction. The PCP trifluoroborate species are bench stable with extended shelf life and easily accessible on a multigram scale by a two‐step synthesis from commercially available PCP. They can be handled conveniently without special precautions, thus overcoming many of the limitations of other PCP cross‐coupling reagents. Additionally, a high yielding regioselective monolithiation/borylation protocol for the synthesis of pseudo‐para and pseudo‐ortho PCP halotrifluoroborates and their subsequent Suzuki–Miyaura cross‐coupling are described.

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“…The second kind is phosphorescent SWPs consisting of metal complex phosphors that can harness triplet excitons via spin–orbital coupling, which are able to achieve 100% IQEs by proper selection of phosphors and polymer hosts with matched energy levels. [ 9–11,18–22 ] Recently, a new kind of SWPs based on thermally activated delayed fluorescence (TADF) [ 23–36 ] emitters, which utilizes the twisted donor–acceptor structure with reduced singlet‐triplet energy splitting (∆ E ST ) to upconvert triplet excitons to singlet ones via reverse intersystem crossing (RISC), has been reported, [ 4–7 ] providing an alternative approach to realize 100% IQEs for SWPs. However, up to now, device performance of SWPs is still behind the requirement of practical application.…”

Section: Figurementioning

confidence: 99%

Single White‐Emitting Polymers with High Efficiency, Low Roll‐Off, and Enhanced Device Stability by Using Through‐Space Charge Transfer Polymer with Blue Delayed Fluorescence as Host for Yellow Phosphor

Shao

et al. 2020

Advanced Optical Materials

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White‐emitting polymers hold great promise for the production of low‐cost and large‐area light sources via solution process. However, the development of efficient and stable white‐emitting polymers has been a formidable challenge yet. Here a strategy for single white‐emitting polymers is demonstrated with high efficiency, low roll‐off, and enhanced device stability by using through‐space charge transfer (TSCT) polymer with small singlet‐triplet energy splitting and blue thermally activated delayed fluorescence as host for yellow phosphor. This strategy not only combines delayed fluorescence and phosphorescence in one polymer to make full use of excitons but also enables the long‐range Förster resonant energy transfer from polymer host to phosphor for suppressing triplet quenching at high luminance, leading to state‐of‐the‐art luminous efficiency of 50.9 cd A−1 at 1000 cd m−2 (corresponding to a low roll‐off of 1.9%) for white‐emitting polymers, together with a tenfold increase in device lifetime over the control polymers based on a conventional polymer host. These results shed light on the prospect of using TSCT polymer with delayed fluorescence as host for developing efficient and stable white‐emitting polymers for solution‐processed white organic light‐emitting diodes.

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

Cited by 128 publications

References 36 publications

Thermally Activated Delayed Fluorescence Materials: Towards Realization of High Efficiency through Strategic Small Molecular Design

Thermally Activated Delayed Fluorescence Materials: Towards Realization of High Efficiency through Strategic Small Molecular Design

Preparation and Synthetic Applications of [2.2]Paracyclophane Trifluoroborates: An Efficient and Convenient Route to Nucleophilic [2.2]Paracyclophane Cross‐Coupling Building Blocks

Single White‐Emitting Polymers with High Efficiency, Low Roll‐Off, and Enhanced Device Stability by Using Through‐Space Charge Transfer Polymer with Blue Delayed Fluorescence as Host for Yellow Phosphor

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