Ultrafast intersystem crossing in a red phosphorescent iridium complex

Hedley, G. J. , Ruseckas, A. and Samuel, I. D.W. (2009) Ultrafast intersystem crossing in a red phosphorescent iridium complex. Journal of Physical Chemistry A, 113(1), pp. 2-4. (doi: 10.1021/jp808944n) (PMID:19072547)

Abstract

Femtosecond photoluminescence (PL) and transient absorption (TA) studies have been carried out on the red phosphorescent metal complex tris(1-phenylisoquinoline)iridium(III) [Ir(piq)3] following excitation of the metal−ligand charge transfer singlet state. Rapid decay of the PL observed at 270 meV above the phosphorescence peak and TA dynamics are indicative of intersystem crossing, which occurs with a time constant of 70 fs. PL decays at 140 meV above the phosphorescence peak are biexponential with time constants of 95 fs and 3 ps, attributed to intramolecular vibrational redistribution (IVR) and vibrational cooling. The larger Ir(piq)3 ligands facilitate faster dissipation of excess energy by IVR than the smaller Ir(ppy)3 core.

• Item Type: Articles (Letter)
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hedley, Dr Gordon
• Authors: Hedley, G. J., Ruseckas, A., and Samuel, I. D.W.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Journal of Physical Chemistry A
• Publisher: American Chemical Society
• ISSN: 1089-5639
• ISSN (Online): 1520-5215
• Published Online: 12 December 2008