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

Elisa Fresta, Giorgio Volpi, Claudio Garino, Claudia Barolo, Rubén D. Costa

Research output: Contribution to journalArticle

19 Citations (Scopus)

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 (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.

Original languageEnglish
Pages (from-to)129-137
Number of pages9
JournalPolyhedron
Volume140
DOIs
Publication statusPublished - 2018 Feb 8
Externally publishedYes

Keywords

  • Aggregation
  • Blue-emission
  • Light-emitting electrochemical cells
  • Pyridilimidazo[1,5-a]pyridine
  • Small molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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