Contextualizing yellow light-emitting electrochemical cells based on a blue-emitting imidazo-pyridine emitter
2017; Elsevier BV; Volume: 140; Linguagem: Inglês
10.1016/j.poly.2017.11.048
ISSN1873-3719
AutoresElisa Fresta, Giorgio Volpi, Claudio Garino, Claudia Barolo, Rubén D. Costa,
Tópico(s)Organic Electronics and Photovoltaics
ResumoThis 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 (Φ) 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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