Iridium metal complexes as an unambiguous probe of intramolecular vibrational redistribution.
Ultrafast luminescence spectroscopy has been undertaken on three iridium cored phosphorescent complexes, with the Ir(ppy)3 molecule being compared with two Ir(ppy)3 cored dendrimers. Energy dissipation by intramolecular vibrational redistribution (IVR) and cooling shows as a luminescence decay because it decreases the admixture of singlet character to the emitting triplet state. A larger amount of vibrational energy dissipates by IVR in dendrimer complexes. We have therefore found a methodology of obtaining unambiguous information on the IVR process and show its potential to study IVR rates as a function of vibrational energy.
Hedley
Gordon J
GJ
Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, United Kingdom.
Ruseckas
Arvydas
A
Liu
Zehua
Z
Lo
Shih-Chun
SC
Burn
Paul L
PL
Samuel
Ifor D W
ID
D050091:Dendrimers / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods; D009942:Organometallic Compounds / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry
D050091:Dendrimers; D009942:Organometallic Compounds; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; D007495:Iridium