Aggregation‐induced emission: Red and near‐infrared organic light‐emitting diodes

Tu, Liangjing; Xie, Yujun; Li, Zhen; Tang, Benzhong

doi:10.1002/smm2.1060

Cited by 112 publications

(75 citation statements)

References 142 publications

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“…We first screened a library of cyanine dyes to bind with albumin and tested the brightness enhancement under the 900+1000 nm sub-NIR-II window 27 , 37 , 38 . As shown in Figure 1 B, by comparing the brightness of 9 dyes diluted in DMSO, PBS, and BSA, we found that cyanine dye@BSA could recover part of brightness compared with them in DMSO, yet cyanine dyes were quenched in PBS due to aggregation caused quench (ACQ) effect 9 , 39 . The solubility was an important factor to decide their photophysical properties, thus we tested the conservative solubility of dyes and dye@BSA in Table S1 .…”

Section: Resultsmentioning

confidence: 95%

Super-stable cyanine@albumin fluorophore for enhanced NIR-II bioimaging

Bai¹,

Hu²,

Han³

et al. 2022

Theranostics

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Near-infrared-II (NIR-II) dyes could be encapsulated by either exogenous or endogenous albumin to form stable complexes for deep tissue bioimaging. However, we still lack a complete understanding of the interaction mechanism of the dye@albumin complex. Studying this principle is essential to guide efficient dye synthesis and develop NIR-II probes with improved brightness, photostability, etc . Methods: Here, we screen and test the optical and chemical properties of dye@albumin fluorophores, and systematically investigate the binding sites and the relationship between dye structures and binding degree. Super-stable cyanine dye@albumin fluorophores are rationally obtained, and we also evaluate their pharmacokinetics and long-lasting NIR-II imaging abilities. Results: We identify several key parameters of cyanine dyes governing the supramolecular/covalent binding to albumin, including a six-membered ring with chlorine (Cl), the small size of side groups, and relatively high hydrophobicity. The tailored fluorophore (IR-780@albumin) exhibits much-improved photostability, serving as a long-lasting imaging probe for NIR-II bioimaging. Conclusion: Our study reveals that the chloride-containing cyanine dyes with the above-screened chemical structure (e.g. IR-780) could be lodged into albumin more efficiently, producing a much more stable fluorescent probe. Our finding partly solves the photobleaching issue of clinically-available cyanine dyes, enriching the probe library for NIR-II bioimaging and imaging-guided surgery.

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Section: Resultsmentioning

confidence: 95%

Super-stable cyanine@albumin fluorophore for enhanced NIR-II bioimaging

Bai¹,

Hu²,

Han³

et al. 2022

Theranostics

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“…From the photoluminescent (PL) spectra of the neat films (Figure 4b,d), pBP‐PXZ shows a yellow emission peak at 554 nm, and the emission of pBP‐PTZ is located at 542 nm, indicating that PXZ has a stronger electron‐pushing effect than PTZ. [ 24 ] However, the PL spectra of pBP‐PXZ and pBP‐PTZ are markedly different in the solution states. Polymers are entirely dispersed by the solvent in the solution state, and the PL spectrum represents the characteristics of a single molecular chain.…”

Section: Resultsmentioning

confidence: 99%

Activating Energy Transfer Tunnels by Tuning Local Electronegativity of Conjugated Polymeric Backbone for High‐Efficiency OLEDs with Low Efficiency Roll‐Off

Zhao

Liu

Hua

et al. 2022

Adv Funct Materials

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Thermally activated delayed fluorescence (TADF) conjugated polymers are attractive for display and illumination applications owing to their excellent device performance and convenient device fabrication. However, conjugated polymers frequently encounter insufficient energy transfer from hosts to TADF units, lowering device performance. Herein, a strategy for improving light-emitting performances through adjusting the local electronegativity of the polymeric backbones by inserting electron-withdrawing atoms and activating energy transmission channels is proposed. Meanwhile, strongly electronegative atoms also affect the charge-transfer natures (CT) of TADF polymers and minimize the energy difference between the lowest singlet and triplet states, leading to a rapid reverse intersystem crossing process through the vibronic coupling between 1 CT and 3 CT with extremely close energy levels. The produced TADF polymer, pBP-PXZ, can achieve an external quantum efficiency (EQE) of 23.11%, exhibiting no roll-off when the luminance is less than 200 cd m −2 whereas only a 3% EQE decrease at 500 cd m −2 . The EQE can even maintain above 19% under 1000 cd m −2 , which is the highest efficiency among TADF polymer-based organic light-emitting diodes (OLEDs) under high luminance. The study provides a new perspective for designing highperformance OLEDs materials.

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“…[12][13][14][15] For multilayered device fabrication, the issue of orthogonal solvents remains a great challenge. 13,16 Therefore, the EL performances of most solution-processed OLEDs are inferior, [17][18][19] lagging far behind those of their vacuum-deposited counterparts. [4][5][6][7][8][9][10] It is urgent to develop highly efficient solution-processed emitting layers with a simple structure.…”

Section: Introductionmentioning

confidence: 99%