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Tuning NIR Absorption and Emission of Diphenyl-dihydrophenazines with Donor-Acceptor Architecture Towards Ultra Narrow Band Gap Abstract
Autoři: Teichmanová Kateřina | Luňák Stanislav | Imramovský Aleš | Nagura Kazuhiko
Rok: 2025
Druh publikace: ostatní - přednáška nebo poster
Strana od-do: nestránkováno
Tituly:
Jazyk Název Abstrakt Klíčová slova
eng Tuning NIR Absorption and Emission of Diphenyl-dihydrophenazines with Donor-Acceptor Architecture Towards Ultra Narrow Band Gap Abstract Near-infrared (NIR) luminescent materials have gained significant attention due to their applications in deep- tissue imaging, solar energy conversion and in fiber-optic systems for efficient data transmission. To achieve NIR emission, two general design strategies have been employed; (1) introduction of strong electron-donating and accepting groups to enhance the intramolecular charge transfer character, and (2) extended π-conjugation with appropriate linker. Herein, we synthesized five derivatives of N,N′-diphenyl-dihydrophenazine (DPPZ) connected to acceptors based on indanone (IO), indan-1,3-dione (IOO) and their analogues with one or two dicyanovinylene groups instead of carbonyls (ID, IDO, IDD). Molecular conformation, twist on methine group and molecular packing in solid-state were studied by X-ray diffractometry of single crystals, solvates and polymorphs in combination with density functional theory (DFT) calculations. Cyclic voltammetry showed a small HOMO energy change but a significant LUMO decrease (~1 eV) from DPPZ-IO to DPPZ-IDD. Absorption shifted dramatically from 545 nm (DPPZ-IO) to 931 nm (DPPZ-IDD), while fluorescence extended from 725 nm to 1012 nm. DPPZ-IDD exhibited an ultranarrow optical bandgap of 1.09 eV, and weak solid-state fluorescence near the NIR I/II border (1000 nm) was observed for DPPZ-ID and DPPZ-IDO powders. Such structures offers new opportunities for advancing next-generation high-efficiency NIR light-emitting materials. NIR Absorption; Fluorescence; Diphenyl-dihydrophenazines; Donor; Acceptor; Ultra Narrow Band Gap

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