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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Molecular Electronics and Excited State Properties II
CPP 27.6: Vortrag
Mittwoch, 19. März 2025, 12:45–13:00, H38
Exceptionally High Two-Photon Absorption Cross Sections in Quinoidal Diazaacene-Bithiophene Derivatives — •Gabriel Sauter1, Antonia Papapostolou2, Audrey Pollien1, Kathleen Fuchs3, Kerstin Brödner3, Jan Freudenberg3, Uwe H. F. Bunz3, Andreas Dreuw2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut — 2Interdisziplinäres Zentrum für Wissenschaftliches Rechnen — 3Organisch-Chemisches Institut, Universität Heidelberg
In nonlinear optics, materials with high two-photon absorption (2PA) cross sections are crucial for bioimaging, photodynamic therapy, and 3D nanoprinting [1]. Our study highlights quinoidal diazaacene-bithiophene derivatives with exceptional 2PA cross sections, reaching 53,600 GM (850-950 nm) and 4,100 GM (1400-1600 nm), unmatched by organic chromophores of this size [3].
Using experimental z-scan techniques and TDDFT calculations, we attribute these properties to the chromophores acceptor-π-donor-π-acceptor structure, which ensures high oscillator strength and strong state coupling. These features optimize transition dipole moment alignment, maximizing 2PA efficiency.
These findings advance the development of efficient NIR-2PA materials for photonic and biomedical applications.
References:
1. F. Kröger et al., RSC Appl. Polym. 2024, 2, 847.
2. K. Fuchs et al., Angew. Chem. Int. Ed. 2024.
Keywords: Two-Photon Absorption; Nonlinear Optical Materials; N-Heteropolycycle; Quinoidal Diazaacene; Structure-property Relationships