Inside Back Cover: Aggregation‐induced emission luminogens for organic light‐emitting diodes with a single‐component emitting layer

Hwang, Jinhyo; Nagaraju, P.; Cho, Min Ju; Choi, Donghoon

doi:10.1002/agt2.327

Cited by 10 publications

(12 citation statements)

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“…Further increasing f w to 90%, the PL intensity of them present an obvious declining trend along with a slight blue-shift of emission peaks, possibly due to the twisted intramolecular charge transfer process. [29][30][31] When increasing the f w from 90% to 99%, the emission intensity of o-DCz-Pm is enhanced, showing an atypical aggregation enhanced emission (AEE) characteristic, [32][33][34][35] which could be due to the formation of stable nanoparticles that prevent the interactions between molecules and water (Figure S4b). As for m-DCz-Pm, even if there is a slight rise at f w of ≈60% comparable to that in THF solution, AEE phenomenon is inconspicuous.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

Aggregation‐induced narrowband isomeric fluorophores for ultraviolet nondoped OLEDs by engineering multiple nonbonding interactions

Huo

et al. 2023

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Traditional donor‐acceptor type organic luminescent materials usually suffer from unfavorable spectral broadening and fluorescence quenching problems arising from strong inter/intra‐chromophore interactions in aggregation state. Here, two ultraviolet carbazole‐pyrimidine isomers (named o‐DCz‐Pm and m‐DCz‐Pm) with novel aggregation‐induced narrowband phenomenon are constructed and systematic investigated by experiments and theoretical simulations. Benefitting from strengthened steric hindrance and multiple noncovalent interactions, the nonradiative decay, vibrational motion, and structural relaxation of singlet state can be effectively suppressed in aggregation state. Consequently, the electroluminescence peak of 397 nm, full width at half maximum of 21 nm and external quantum efficiency of 3.4% are achieved simultaneously in nondoped o‐DCz‐Pm‐based device. This work paves an avenue toward the development of high‐performance narrowband nondoped ultraviolet materials and organic light‐emitting diodes.

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Section: Photophysical Propertiesmentioning

confidence: 99%

Aggregation‐induced narrowband isomeric fluorophores for ultraviolet nondoped OLEDs by engineering multiple nonbonding interactions

Huo

et al. 2023

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“…Generally, AIEgens are not emissive in the solution because the free-rotation of phenyl groups deactivates the photoluminescence intensity, whereas such AIEgens can increase the photoluminescence intensity drastically in the solid state owing to the restriction of intramolecular motion. Thus, over the last two decades, many papers have been published based on the AIEgen containing materials for solar cells, [36][37][38] organic light emitting diodes (OLEDs), [39][40][41][42] sensing applications, [43][44][45][46][47] photocatalysis, [48] and biomedical fields. [49][50][51] On the contrary, very limited papers were published based on the AIEgen-decorated porphyrins for fluorescence bioimaging, photodynamic therapy (PDT), photocatalytic hydrogen F I G U R E 1 Structures of AIEgens attached to porphyrin macrocycle evolution (PHE), solid state photoluminescence, electrochemiluminescence (ECL), and self-assembled studies.…”

Section: Introductionmentioning

confidence: 99%

An overview on AIEgen‐decorated porphyrins: Current status and applications

2023

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One of the major obstacles of porphyrins is the aggregation-caused quenching (ACQ) of photoluminescence due to the strong intermolecular π-π interaction of the planar porphyrin core in the solid state. However, ACQ leads to the nonradiative deactivation of the photoexcited states which results in short-lived charge-separated states and thus low photoluminescence and singlet quantum yields. This phenomenon would limit the utilization of porphyrins in near-infrared fluorescent bioimaging, photodynamic therapy, photocatalytic hydrogen evolution, electrochemiluminescence, and chiroptical applications. Hence, to address the ACQ property of porphyrins and enhance the performance of the above applications, a limited number of AIEgen-decorated porphyrins have been designed, synthesized, and tested for their applications. It has been found that the introduction of AIEgens, such as tetraphenylethylene, diphenylacrylonitrile, (3,6-bis-(1-methyl-4-vinylpyridinium)-carbazole diiodide, and iridium motif into the porphyrin core, transformed the porphyrins from ACQ to aggregation-induced emission (AIE) in their solid state due to the reduced strong intermolecular π-π stacking of porphyrins. Consequently, such porphyrins containing AIE features are employed as potential candidates in the above-mentioned applications. In this review, we summarize the AIEgen-decorated porphyrins which have been published to date, and also discuss the benefits of converting porphyrins from ACQ to AIE for enhanced performance within each application. As far as we know, there is no review that summarizes the structures and applications of AIEgen-decorated porphyrins to date. Therefore, we presume that this review would be helpful to design more efficient AIEgen-decorated porphyrins for a wide range of applications in the future.

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“…Recently, hot exciton materials with AIE characteristics have been reported. [23][24][25][26][27] Tang et al 23 designed and synthesized a class of Y-type pyrene-based blue AIE materials Py-TPA, Py-TPA, and Py-2TPE. These AIE molecules show unique electronic characteristics and small T 2 -S 1 splitting energy, which is conducive to the transition of excitons from the triplet state to singlet state through hRISC to improve the utilization rate of triplet state excitons, and thus improve the efficiency of OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Design, synthesis and application of tetraphenylbenzene-based blue organic electroluminescent materials with aggregation-induced emission and hot exciton properties

Dong,

Cao,

Dong

et al. 2023

J. Mater. Chem. C

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Inside Back Cover: Aggregation‐induced emission luminogens for organic light‐emitting diodes with a single‐component emitting layer

Cited by 10 publications

References 0 publications

Aggregation‐induced narrowband isomeric fluorophores for ultraviolet nondoped OLEDs by engineering multiple nonbonding interactions

Aggregation‐induced narrowband isomeric fluorophores for ultraviolet nondoped OLEDs by engineering multiple nonbonding interactions

An overview on AIEgen‐decorated porphyrins: Current status and applications

Design, synthesis and application of tetraphenylbenzene-based blue organic electroluminescent materials with aggregation-induced emission and hot exciton properties

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