3 years ago

Highly Stable and Efficient Light-Emitting Electrochemical Cells Based on Cationic Iridium Complexes Bearing Arylazole Ancillary Ligands

Highly Stable and Efficient Light-Emitting Electrochemical Cells Based on Cationic Iridium Complexes Bearing Arylazole Ancillary Ligands
Antonio Pertegás, Enrique Ortí, Gustavo Espino, José M. Junquera-Hernández, Jesús Cerdá, Ana M. Rodríguez, Marta Martínez-Alonso, Henk Bolink, Aránzazu Heras, Cristina Momblona
A series of bis-cyclometalated iridium(III) complexes incorporating imidazole-based arylazole N^N ligands is reported and their use as electroluminescent materials in light-emitting electrochemical cell (LEC) devices is investigated. LECs performance is determined by the nature of the emitting state (3MLCT/3LLCT vs 3LC) and the electrochemical stability of the complex. Complexes using N−CH3-protected benzimidazole units lead to LECs with simultaneous high luminance (904 cd m−2), efficiency (9.15 cd A−1), and stability (lifetime over 2500 h).

Publisher URL: http://dx.doi.org/10.1021/acs.inorgchem.7b01167

DOI: 10.1021/acs.inorgchem.7b01167

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