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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

DREYSE, PAULINA; LOEB, BÁRBARA; BARRERA, MAURICIO  e  GONZALEZ, IVÁN. ANOMALOUS BEHAVIOR OF Ir(III) CYCLOMETALATED COMPLEXES: APPLICATION IN LIGHT-EMITTING ELECTROCHEMICAL CELLS. J. Chil. Chem. Soc. [online]. 2014, vol.59, n.3, pp.2628-2631. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072014000300023.

The cationic Ir(III) complex with 7,8-benzoquinoline (bzq) as cyclometalating ligand and 4,4'-diterbutyl-2,2'-bipyridine (tBuB) as ancillary ligand, [Ir(bzq)2(tBuB)](PF6) (1), was utilized in the fabrication of a light-emitting electrochemical cell (LEC). The photophysical properties and the characterization of the LEC device with this complex was compared with literature data for the analogous complex with 2-phenylpyridine (ppy), [Ir(ppy)2(tBuB)](PF6) (2). Complex 1 showed blue shifted emission compared to complex 2. Surprisingly, complex 1 shows lower luminance, efficiency and stability in regard to 2. This behavior correlated well with the low values of quantum yield and lifetime, registered for complex 1 in solution. The performance observed is unexpected, taking into account the emission wavelengths recorded for each complex, and the lesser non radiative deactivation processes expected for a complex with a more rigid ligand as bzq. A possible explanation of this behavior is given in terms of the predominance of a fluorescent emission in the case of the complex 1 instead of a phosphorescent emission, as observed for complex 2.

Palavras-chave : light-emitting electrochemical cell; cyclometalated complexes; phosphorescence; fluorescence.

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