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Fluorescent antiparallel dimers of puh-pull substituted stilbenes

Autoři: Imramovský Aleš | Teichmanová Kateřina | Smolka Rastislav | Vala Martin | Luňák Stanislav

Rok: 2025

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

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Jazyk	Název	Abstrakt	Klíčová slova
eng	Fluorescent antiparallel dimers of puh-pull substituted stilbenes	Luminescent materials based on all-organic conjugated molecules are usually used in solid physical form in technological fields, such as biological probes, chemical sensing, optoelectronic systems and stimuli-responsive materials. Solid-state organic luminophores emitting in the far red/near infrared spectral region (FR/NIR, 650–900 nm or 1000 nm) are especially important in the fields of OLED and bioimaging. Such low band-gap organic materials usually show lower photoluminescence quantum yields (PLQY) than emitters in shorter wavelength regions, because of intramolecular non-radiative processes, which are preferred according to the so-called “energy-gap” law, and intermolecular formation of detrimental cofacial aggregates. The efficiency of SSF depends on the combination of nonradiative intramolecular deactivation processes, intermolecular arrangement and morphology, the net effect of which can cause either quenching or enhancement of the photoluminescence quantum yield (PLQY) compared to solution. Substituted stilbenes with diphenylamino electron donor, dicyanovinylene acceptor and a pair of side-aryls fluoresce intensely both in solution and solid state. Going from side phenyl to 3,6-xylyl lets the fluorescence in chloroform nearly the same (around 700 nm), but shifts the solid state fluorescence from infrared (733 nm) to red (631 nm), due to the formation of different isolated dimers in crystals as atypical fluorescence quenching.	Fluorescence; dimers; push-pull; stilbenes

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