A series of iridium complexes equipped with inert shields: Highly efficient bluish green emitters with reduced self-quenching effect in solid state

作者：He, Wei^*; Zu, Da-jian; Liu, De-min; Cheng, Ran

来源：Inorganica Chimica Acta, 2011, 365(1): 78-84.

DOI：10.1016/j.ica.2010.08.038

• Iridium complex
• Bluish green
• Self-quenching
• Inert shield

In this paper, we synthesize a series of cyclometalated ligands and their corresponding Ir(III) complexes using pentane-2,4-dione as the auxiliary ligand. We discuss the photophysical properties of these Ir(III) complexes in detail, including their UV-Vis absorption spectra, photoluminescence spectra in solid and liquid states, luminescence decay lifetimes, and luminescence quantum yields. The correlation between self-quenching effect and molecular structure is also investigated. It is found that these Ir(III) complexes are solid-emitting ones due to their reduced self-quenching in solid state. Theoretical calculation and experimental data reveal that the following two reasons should be responsible for the reduced self-quenching in solid state: (1) pentane-2,4-dione, phenyl, and triphenylamine moieties serve as inert shields for the excited state Ir(III) complexes; (2) the radiative decay process in these Ir(III) complexes is accelerated by the introduction of electron-donors, and thus partly immune from self-quenching caused by intermolecular action.

• 出版日期2011-1-15
• 单位华中科技大学