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3 October 2022 Electronic excitation dynamics of dibenzo [a,i] pyrene oligomers
Suman Gunasekaran, Xiushang Xu, Scott Renken, Lorenzo Ripani, Dieter Schollmeyer, Woojae Kim, Massimo Marcaccio, Andrew J. Musser, Akimitsu Narita
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Proceedings Volume PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI; PC121990E (2022) https://doi.org/10.1117/12.2636030
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
We report the synthesis of a new series of oligomers derived from dibenzo[a,i]pyrene. The compounds were characterized by steady-state and transient absorption spectroscopies. The results indicate that the compounds fluoresce from a formally dark S1 electronic state that is enabled by intensity borrowing from a neighboring bright S2 state. While the monomer exhibits a relatively low photoluminescence quantum yield (PLQY), the dimer exhibits a significantly enhanced PLQY due to a greater S2 intensity borrowing. Moreover, symmetry-breaking charge transfer in the dimer was demonstrated by investigations in solvents of different polarity.
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Suman Gunasekaran, Xiushang Xu, Scott Renken, Lorenzo Ripani, Dieter Schollmeyer, Woojae Kim, Massimo Marcaccio, Andrew J. Musser, and Akimitsu Narita "Electronic excitation dynamics of dibenzo [a,i] pyrene oligomers", Proc. SPIE PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI, PC121990E (3 October 2022); https://doi.org/10.1117/12.2636030
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KEYWORDS
Absorption spectroscopy
Luminescence
Absorption
Femtosecond phenomena
Organic materials
Quantum efficiency
Spectroscopy
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