Inorg. Chem. 2009, 48, 6501–6508 6501 DOI: 10.1021/ic9003164
Photophysics of Heteroleptic Iridium(III) Complexes Of Current Interest; a Closer Look on Relaxation Dynamics Hsin-Sheng Duan,† Pi-Tai Chou,*,† Cheng-Chih Hsu,† Jui-Yi Hung,‡ and Yun Chi*,‡ †
Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C, and ‡Department of Chemistry, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu 30013, Taiwan, R.O.C
Received February 16, 2009
The excited-state dynamics of heteroleptic iridium(III) complexes have been investigated using femto-nanosecond timeresolved luminescence and transient absorption spectroscopy. Two prototypical examples illustrated here are iridium(III) 0 0 bis[2-(2,4-difluorophenyl)pyridinato-N,C2 ] quinaldinate (1) and iridium(III) bis[2-(2,4-difluorophenyl)pyridinato-N,C 2 ][2-(6-methylbenzoxazol-2-yl)phenolate] (2). Upon photoexcitation at, for example, 400 nm, the emission decay, monitored at the region of phosphorescence, for both 1 and 2 consists of a system response limited rise (
