A periphery cladding strategy to improve the performance of narrowband emitters, achieving deep-blue OLEDs with CIEy &lt; 0.08 and external quantum efficiency approaching 20%

Wang, Yaxiong; Duan, Yalei; Guo, Runda; Ye, Shaofeng; Di, Kaiyuan; Zhang, Weizhuo; Zhuang, Shaoqing; Wang, Lei

doi:10.1016/j.orgel.2021.106275

Cited by 50 publications

(35 citation statements)

References 43 publications

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“…D = photoactive electron donor and A = electron acceptor) have attracted much attention in the scientific community due to their importance in a wide range of applications such as dye-sensitized solar cells (DSSCs) and bulk heterojunction (BHJ) solar cells, [1][2][3][4][5][6][7] sensors, [8][9][10] electrochromic devices as well as optical, electronic and magnetic materials. [11][12][13] Synthetically, the multi-modularity could be accomplished starting from D-π-π-D, D-π-D, D-π-spacer-π-D type dimeric materials followed by introducing an electron acceptor making use of the π-spacer leading to the formation of D-A-π-D, D-A-D and D-A-spacer-π-D type donor-acceptor conjugates. One of the advantages of this approach is placing the D and A in close proximity promoting efficient intramolecular charge transfer (ICT) both in the ground (polarization) and excited states.…”

Section: Introductionmentioning

confidence: 99%

Near‐IR Intramolecular Charge Transfer in Strongly Interacting Diphenothiazene‐TCBD and Diphenothiazene‐DCNQ Push‐Pull Triads

Yadav

Jang

Rout

et al. 2022

Chemistry A European J

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Three types of phenothiazines dimers (PTZ‐PTZ, 1–3), covalently linked with one or two acetylene linkers, were synthesized by copper‐mediated Eglinton and Pd‐catalyzed Sonogashira coupling reactions in excellent yields. The dimers 1–3 were further engaged in [2+2] cycloaddition‐retroelectrocyclization reactions with strong electron acceptors, tetracyanoethylene (TCNE) and 7,7,8,8‐tetracyanoquinodimethane (TCNQ) to yield tetracyanobutadiene (TCBD, 1 a–3 a), and dicyanoquinodimethane (DCNQ, 1 b–3 b) functionalized donor‐acceptor (D‐A) conjugates, respectively. The conjugates were examined by a series of spectral, computational, and electrochemical studies. Strong ground state polarization leading to new optical transitions was witnessed in both series of D‐A conjugates. In the case of DCNQ derived D‐A system 1 b, the optical coverage extended until 1200 nm in benzonitrile, making this a rare class of D‐A ICT system. Multiple redox processes were witnessed in these D‐A systems, and the frontier orbitals generated on DFT optimized structures further supported the ICT phenomenon. Photochemical studies performed using femtosecond pump‐probe studies confirmed solvent polarity dependent excited state charge transfer and separation in these novel multi‐modular D‐A conjugates. The charge‐separated states lasted up to 70 ps in benzonitrile while in toluene slightly prolonged lifetime of up to 100 ps was witnessed. The significance of phenothiazine dimer in wide‐band optical capture all the way into the near‐IR region and promoting ultrafast photoinduced charge transfer in the D‐A‐D configured multi‐modular systems, and the effect of donor‐acceptor distance and the solvent polarity was the direct outcome of the present study.

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Section: Introductionmentioning

confidence: 99%

Near‐IR Intramolecular Charge Transfer in Strongly Interacting Diphenothiazene‐TCBD and Diphenothiazene‐DCNQ Push‐Pull Triads

Yadav

Jang

Rout

et al. 2022

Chemistry A European J

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“…Up to date, a variety of electron‐rich (or electron‐withdrawing) groups have been introduced onto this conjugated skeleton to optimize the device performance (Figure 6 ). [ 37 , 52 ]…”

Section: The Value Of Incorporating 14‐azaborinesmentioning

confidence: 99%

The Rise of 1,4‐BN‐Heteroarenes: Synthesis, Properties, and Applications

Chen

2022

Advanced Science

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Dedicated to Professor Klaus Müllen on the occasion of his 75th birthdayBN-heteroarenes, which employ both boron and nitrogen in aromatic hydrocarbons, have gained great attention in the fields of organic chemistry and materials science. Nevertheless, the extensive studies on BN-heteroarenes are largely limited to 1,2-azaborine-based compounds with B-N covalent bonds, whereas 1,3-and 1,4-BN-heteroarenes are relatively rare due to their greater challenge in the synthesis. Recently, significant progresses have been achieved in the synthesis and applications of BN-heteroarenes featuring 1,4-azaborines, especially driven by their significant potential as multiresonant thermally activated delayed fluorescence (MR-TADF) materials. Therefore, it is timely to review these advances from the chemistry perspective. This review summarizes the synthetic methods and recent achievements of 1,4-azaborine-based BN-heteroarenes and discusses their unique properties and potential applications of this emerging class of materials, highlighting the value of 1,4-BN-heteroarenes beyond MR-TADF materials. It is hoped that this review would stimulate the conversation and cooperation between chemists who are interested in azaborine chemistry and materials scientists working in the fields of organic optoelectronics, metal catalysis, and carbon-based nanoscience etc.

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“…[38][39][40][41] With increasing doping concentrations, the OLEDs often show sharp efficiency declines accompanied by significant spectral broadening. [42][43][44][45][46][47][48] The strict control of low doping concentrations increases the difficulties and costs of device fabrication and may cause insufficient energy transfer and potential phase segregation. 49 To address these issues, recently, Duan et al and Yang et al respectively proposed the introduction of bulky steric hindrances to wrap the MR cores.…”

Section: New Conceptsmentioning

confidence: 99%

Distinguishing the respective determining factors for spectral broadening and concentration quenching in multiple resonance type TADF emitter systems

et al. 2022

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A periphery cladding strategy to improve the performance of narrowband emitters, achieving deep-blue OLEDs with CIEy < 0.08 and external quantum efficiency approaching 20%

Cited by 50 publications

References 43 publications

Near‐IR Intramolecular Charge Transfer in Strongly Interacting Diphenothiazene‐TCBD and Diphenothiazene‐DCNQ Push‐Pull Triads

Near‐IR Intramolecular Charge Transfer in Strongly Interacting Diphenothiazene‐TCBD and Diphenothiazene‐DCNQ Push‐Pull Triads

The Rise of 1,4‐BN‐Heteroarenes: Synthesis, Properties, and Applications

Distinguishing the respective determining factors for spectral broadening and concentration quenching in multiple resonance type TADF emitter systems

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