Combining Charge‐Transfer Pathways to Achieve Unique Thermally Activated Delayed Fluorescence Emitters for High‐Performance Solution‐Processed, Non‐doped Blue OLEDs

Chen, Xulin; Jia, Ji-Hui; Yu, Rongmin; Liao, Jian-Zhen; Yang, Mingxue; Lu, Can‐Zhong

doi:10.1002/anie.201709125

Cited by 227 publications

(129 citation statements)

References 23 publications

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“…The emissions from the films of CzTCF and tBCzTCF are further redshifted by 85 and 93 nm to 675 and 712 nm, respectively, which could be ascribed to solid‐state aggregation. It is noteworthy that the PLQY of CzTCF and tBCzTCF films were dramatically increased to 16.5 % and 26.6 %, respectively, which should be attributed to the improved TADF emission through the combination of intramolecular and intermolecular charge transfer paths . This feature of aggregation‐enhanced emission was further investigated by measuring their PL spectra in tetrahydrofuran (THF)/water mixtures (Figure S3 in the Supporting Information), which makes CzTCF and tBCzTCF competent to serve as emitters in host‐free OLEDs.…”

Section: Resultsmentioning

confidence: 99%

Simply Structured Near‐Infrared Emitters with a Multicyano Linear Acceptor for Solution‐Processed Organic Light‐Emitting Diodes

Zhao

Xie

Wang

et al. 2019

Chemistry A European J

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Near‐infrared (NIR) organic light‐emitting diodes (OLEDs) show great potential in a variety of applications including sensors, night vision, and information security. Despite the superiority of thermally activated delayed fluorescence (TADF) in 100 % exciton harvesting, the development of NIR TADF OLEDs is still a great challenge, especially in terms of solution‐processing technology. In this work, a multicyano acceptor of 2‐dicyanomethylene‐3‐cyano‐4,5,5‐trimethyl‐2,5‐dihydrofurance (TCF) with strong electron‐withdrawing ability was employed to construct solution‐processible NIR emitters, CzTCF and tBCzTCF, with the feature of donor–π–acceptor (D–π–A) structure. The significantly enhanced intermolecular charge transfer effects not only render the deep‐red and NIR emissions of CzTCF and tBCzTCF films, respectively, but also lead to their typical TADF characteristics. Consequently, the nondoped solution‐processed NIR OLED based on tBCzTCF was successfully demonstrated with the peak wavelength of 715 nm, which paves the way for developing NIR emitters without polycyclic aromatic cores and heavy‐metal ions.

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Section: Resultsmentioning

confidence: 99%

Simply Structured Near‐Infrared Emitters with a Multicyano Linear Acceptor for Solution‐Processed Organic Light‐Emitting Diodes

Zhao

Xie

Wang

et al. 2019

Chemistry A European J

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“…One commonly used strategy is to employ donor–acceptor systems in which the donor and the acceptor units are spatially separated with an approximate orthogonal arrangement to minimize exchange interactions and spatial overlap of the HOMO and the LUMO so that the Δ E ST can be minimized . As triarylborane units are well‐known to be very effective and stable electron acceptors with excellent structural tunability, it is not surprising that many highly effective TADF emitters use a triarylboron moiety as the electron‐acceptor unit, and many such examples have been demonstrated recently . Representative examples of this type of boron‐containing TADF emitter (type (a)) are shown in Figure a.…”

Section: Boron Molecules In Oledsmentioning

confidence: 99%

Boron: Its Role in Energy‐Related Processes and Applications

et al. 2020

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Boron's unique position in the Periodic Table, that is, at the apex of the line separating metals and nonmetals, makes it highly versatile in chemical reactions and applications. Contemporary demand for renewable and clean energy as well as energy‐efficient products has seen boron playing key roles in energy‐related research, such as 1) activating and synthesizing energy‐rich small molecules, 2) storing chemical and electrical energy, and 3) converting electrical energy into light. These applications are fundamentally associated with boron's unique characteristics, such as its electron‐deficiency and the availability of an unoccupied p orbital, which allow the formation of a myriad of compounds with a wide range of chemical and physical properties. For example, boron's ability to achieve a full octet of electrons with four covalent bonds and a negative charge has led to the synthesis of a wide variety of borate anions of high chemical and electrochemical stability—in particular, weakly coordinating anions. This Review summarizes recent advances in the study of boron compounds for energy‐related processes and applications.

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“…23 Deuterated solvents from EURISO-TOP were used. Commercially available reagents were used as received.…”

Section: Methodsmentioning

confidence: 99%

Thermally Activated Delayed Fluorescent Properties of Ortho‐Carbazole‐Appended Triazine Compounds

Mubarok

Lee

et al. 2019

Bulletin Korean Chem Soc

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These authors contributed equally to this work.We report the synthesis and thermally activated delayed fluorescent (TADF) properties of ortho-carbazole-appended triazine compounds. Two donor (D)-acceptor (A) compounds, CzMeoTRZ (1) and BuCzMeoTRZ (2), in which the carbazole (Cz and t-BuCz) donor and 4,6-dipheny-1,3,5-triazine (TRZ) acceptor moieties are linked in the ortho position of the 3-methylphenylene ring were prepared and characterized. Both compounds exhibit broad blue emission at 465 and 487 nm, respectively (photoluminescence quantum yield, Φ PL = 27% and 49% in toluene), which is typical of the donor to acceptor ICT transition. The transient PL decay measurements confirm that both compounds have TADF character with the microsecond-range delayed lifetimes (τ d = 1.09 μs for 1 and 1.51 μs for 2). Electrochemical analysis indicates that both compounds undergo carbazole-centered oxidation and triazine-centered reduction. Theoretical studies further show the twisted D-A structure, effective separation of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), and small energy splitting between the excited singlet and triplet states for 1 and 2, all of which support the observed TADF.

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Combining Charge‐Transfer Pathways to Achieve Unique Thermally Activated Delayed Fluorescence Emitters for High‐Performance Solution‐Processed, Non‐doped Blue OLEDs

Cited by 227 publications

References 23 publications

Simply Structured Near‐Infrared Emitters with a Multicyano Linear Acceptor for Solution‐Processed Organic Light‐Emitting Diodes

Simply Structured Near‐Infrared Emitters with a Multicyano Linear Acceptor for Solution‐Processed Organic Light‐Emitting Diodes

Boron: Its Role in Energy‐Related Processes and Applications

Thermally Activated Delayed Fluorescent Properties of Ortho‐Carbazole‐Appended Triazine Compounds

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