This work provides the synthesis, structural characterization, electrochemical and photophysical features, as well as the application in light-emitting electrochemical cells (LECs) of a novel small molecule belonging to the pyridilimidazo[1,5-a]pyridine family, namely 3-(2-methoxyphenyl)-5-methyl-1-(6-methylpyridin-2-yl)H-imidazo[1,5-a]pyridine (Me-impy). This compound shows a low-cost and facile synthesis, excellent redox properties, and a high photoluminescence quantum yield of 0.4 associated to a blue emission (436 nm) in solution. Despite these appealing features, the emission in solid state is red-shifted to the yellow region, owing to its aggregation character. Additionally, the electroluminescence response shows a broader and red-shifted emission even upon dilution of Me-impy thin films with polymethyl methacrylate (PMMA). Herein, we report an in-depth study on the aggregation features and their impact on the electroluminescence response of Me-impy, providing relevant information to design small-molecule based LECs.

Contextualizing yellow light-emitting electrochemical cells based on a blue-emitting imidazo-pyridine emitter

Fresta, Elisa;Volpi, Giorgio;Garino, Claudio;Barolo, Claudia;
2018

Abstract

This work provides the synthesis, structural characterization, electrochemical and photophysical features, as well as the application in light-emitting electrochemical cells (LECs) of a novel small molecule belonging to the pyridilimidazo[1,5-a]pyridine family, namely 3-(2-methoxyphenyl)-5-methyl-1-(6-methylpyridin-2-yl)H-imidazo[1,5-a]pyridine (Me-impy). This compound shows a low-cost and facile synthesis, excellent redox properties, and a high photoluminescence quantum yield of 0.4 associated to a blue emission (436 nm) in solution. Despite these appealing features, the emission in solid state is red-shifted to the yellow region, owing to its aggregation character. Additionally, the electroluminescence response shows a broader and red-shifted emission even upon dilution of Me-impy thin films with polymethyl methacrylate (PMMA). Herein, we report an in-depth study on the aggregation features and their impact on the electroluminescence response of Me-impy, providing relevant information to design small-molecule based LECs.
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https://www.sciencedirect.com/science/article/pii/S0277538717307763
Light-emitting electrochemical cells, Blue-emission, Small molecules, Pyridilimidazo[1,5-a]pyridine, Aggregation
Fresta, Elisa; Volpi, Giorgio; Garino, Claudio; Barolo, Claudia; Costa, Rubén D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1657604
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