Molecular design strategy for through-space charge transfer blue polyimides with rigid non-conjugated backbone and the role of alicyclic imide linker

Long, Yubo; Chen, Kaijin; Li, Chuying; Wang, Wenhui; Bian, Jinkun; Li, Yuxuan; Chi, Zhenguo; Xu, Jiarui; Zhang, Yi

doi:10.1016/j.cej.2023.144759

Chemical Engineering Journal

2023

DOI: 10.1016/j.cej.2023.144759

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Molecular design strategy for through-space charge transfer blue polyimides with rigid non-conjugated backbone and the role of alicyclic imide linker

Yubo Long

Kaijin Chen

Chuying Li

et al.

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2024

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Cited by 14 publications

References 48 publications

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Multi‐Resonance TADF Conjugated Polymers toward Highly Efficient Solution‐Processible Narrowband Green OLEDs

Wang,

Huang,

Zhang

et al. 2024

Adv Funct Materials

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Due to the extended conjugation along the polymeric backbone and the scarcity of suitable multi‐resonance (MR) emitting units for polymerization, precisely adjusting the colors of MR‐thermally activated delayed fluorescence (MR‐TADF) conjugated polymers to green and red region remains to be a formidable challenge. Herein, this work develops a series of green MR‐TADF polymers for the first time by attaching MR emitting moiety as pendant to an acceptor triphenyltriazine while simultaneously embedding acceptor moiety into polycarbazole backbone. Benefitting from the enhanced intramolecular charge transfer (ICT) interaction by introducing acceptor on the para‐carbon position of boron (B) atom of the MR unit, as well as extended conjugation along backbone, all polymers exhibit red‐shifted emissions with emission peaks of 505–517 nm and full‐width at half maximums (FWHMs) of below 48 nm compared to the pendant bluish‐green MR unit peaking at 484 nm. The solution‐processed devices based on these polymers exhibit excellent performances with maximum quantum efficiency (EQE) of 22.2%, emission peak at 511 nm and FWHM of 44 nm, which represents the state‐of‐the‐art performance among the MR‐TADF polymer‐based narrowband OLEDs.

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Multi‐Resonance TADF Conjugated Polymers toward Highly Efficient Solution‐Processible Narrowband Green OLEDs

Wang,

Huang,

Zhang

et al. 2024

Adv Funct Materials

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Highly Efficient and Bright Blue OLEDs via TSCT‐TADF Molecule Regulated by Indolo[3,2,1‐jk]Carbazole

Guo,

Tang,

Gong

et al. 2024

Advanced Optical Materials

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Thermally activated delayed fluorescence (TADF) materials with the through‐space charge transfer (TSCT) effects can provide a useful approach to efficiently utilize dark state triplet excitons through an efficient reverse intersystem crossing process. TSCT‐TADF emitters PCzoTrz‐ICz with small ∆EST values and high photoluminescence quantum yield is designed and synthesized using common acceptor triazine, donor 3,6‐diphenylcarbazole and Indolo[3,2,1‐jk]carbazole which is a rigid π‐conjugated group with high triplet state and high thermal stability. The doped‐organic light‐emitting diodes using PCzoTrz‐ICz as emitters exhibit high tolerance to host with different polarity and charge transport properties, and PCzoTrz‐ICz doped devices in 2,8‐bis(diphenylphosphoryl)dibenzofuran even realizes a maximum external quantum efficiency (EQEmax) of 32.5% and maximum current efficiency (CEmax) of 74.1 cd A−1, which is higher than EQEmax of 28.1% and CEmax of 64.8 cd A−1 of PCzoTrz. Moreover, PCzoTrz‐ICz can be used as highly efficient sensitizers for narrow band blue emitter of v‐DABNA, and achieves more than EQEmax of 33.3%, maximum luminance of 26,291 cd m−2, CEmax of 42.7 cd A−1 and blue index of 237 cd A−1 CIEy−1.

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Large π‐Conjugated Structure Strategy for Optimizing Polyimide Film‐Forming Properties and Developing Gas Fluorescence Sensors

Wang,

Xu,

Wang

et al. 2024

J of Applied Polymer Sci

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Four different amounts of anthracene groups were introduced into the polyimide (PI) backbone by one‐step polycondensation. This bulky and rigid polycyclic aromatic hydrocarbon structure effectively improved the solubility of the polyimide material. Therefore, the anthracene‐containing polyimides (ANPIs) were easily cast into the films at room temperature. The introduction of anthracene chromophores significantly developed the fluorescence performance of polyimides. It was found that the photoluminescence emission band of ANPIs migrated from the blue to the orange light region as the samples changed from solution to film. This is related to the aggregation of molecular chains in a solid state. Furthermore, ethanol and phenylethanol were selected to investigate the fluorescence response of the ANPI film. Interestingly, the sample displayed a noticeable luminescent “turn‐off” effect on the targets. It could be considered a convenient strategy for the detection of organic gases.

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Molecular design strategy for through-space charge transfer blue polyimides with rigid non-conjugated backbone and the role of alicyclic imide linker

Cited by 14 publications

References 48 publications

Multi‐Resonance TADF Conjugated Polymers toward Highly Efficient Solution‐Processible Narrowband Green OLEDs

Multi‐Resonance TADF Conjugated Polymers toward Highly Efficient Solution‐Processible Narrowband Green OLEDs

Highly Efficient and Bright Blue OLEDs via TSCT‐TADF Molecule Regulated by Indolo[3,2,1‐jk]Carbazole

Large π‐Conjugated Structure Strategy for Optimizing Polyimide Film‐Forming Properties and Developing Gas Fluorescence Sensors

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