Journal
INORGANICA CHIMICA ACTA
Volume 368, Issue 1, Pages 37-43Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2010.12.035
Keywords
Iridium complex; Bluish green; Self-quenching; Steric blocking
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In this paper, we report two easily-synthesized Ir(III) complexes equipped with steric blocking phosphine ligands of bis(2-(diphenylphosphanyl)phenyl) (POP) and triphenylphosphane (PPh3), Ir-POP and Ir-PPh3. Their crystal structures, electronic nature, photophysical properties, and phosphorescence self-quenching mechanism are discussed in detail. It is found that the thermally activated intermolecular interaction is responsible for the phosphorescence self-quenching. The introduction of steric blocking ligands into Ir( III) complexes can efficiently suppress the phosphorescence self-quenching in solid state. We successfully realize a solid state emission peaking at 494 nm, with a long excited state lifetime of 15 mu s and a high photoluminescence quantum yield of 0.17. (C) 2010 Elsevier B.V. All rights reserved.
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