Indexed by:期刊论文
Date of Publication:2018-06-18
Journal:CHEMISTRY-A EUROPEAN JOURNAL
Included Journals:PubMed、SCIE
Volume:24
Issue:34
Page Number:8577-8588
ISSN No.:0947-6539
Key Words:absorption; density functional calculations; iridium; ligand effects; upconversion
Abstract:A series of substituted 2-phenylquinoxaline ligands have been explored to finely tune the visible emission properties of a corresponding set of cationic, cyclometallated iridium(III) complexes. The electronic and redox properties of the complexes were investigated through experimental (including time-resolved luminescence and transient absorption spectroscopy) and theoretical methods. The complexes display absorption and phosphorescent emissions in the visible region that are attributed to metal to ligand charge-transfer transitions. The different substitution patterns of the ligands induce variations in these parameters. Time-dependent DFT studies support these assignments and show that there is likely to be a strong spin-forbidden contribution to the visible absorption bands at lambda = 500-600 nm. Calculations also reliably predict the magnitude and trends in triplet emitting wavelengths for the series of complexes. The complexes were assessed as potential sensitisers in triplet-triplet annihilation upconversion experiments by using 9,10-diphenylanthracene as the acceptor; the methylated variants performed especially well with impressive upconversion quantum yields of up to 39.3%.
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Alma Mater:Jilin University
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