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Theoretical and Experimental Investigation on the Intersystem Crossing Kinetics in Benzothioxanthene Imide Luminophores, and Their Dependence on Substituents Effects

submitted on 25.02.2020, 13:24 and posted on 26.02.2020, 06:04 by Laura Abad Galan, Jose Maria Andrés Castán, Clement Dalinot, Pablo Simon Marques, Philippe Blanchard, Olivier MAURY, Clement Cabanetos, Tangui Le Bahers, Cyrille Monnereau

In spite of their remarkable luminescence properties, benzothioxanthene imide (BTXI an imide containing rylene chromophores) derivatives have been largely overlooked compared to their perylene bisimide and naphthalene bisimide counterparts. Thus their detailed photophysics are much less understood. In this paper, we show how relatively simple structural modifications of the backbone of BTXIs can lead to impressive variations in their Inter-System Crossing kinetics. Thus, through rational engineering of their structure, it is possible to obtain a triplet formation quantum yield that reaches unity, making BTXI a promising class of compounds for triplet-based applications (photodynamic therapy, electroluminescence, etc.).


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ENS de Lyon



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