Photophysics of Heteroleptic Iridium(III) Complexes Of Current Interest; a Closer Look on Relaxation Dynamics

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hsin-Sheng Duan
  • Pi-Tai Chou
  • Cheng-Chih Hsu
  • Jui-Yi Hung
  • Yun Chi

Detail(s)

Original languageEnglish
Pages (from-to)6501-6508
Journal / PublicationInorganic Chemistry
Volume48
Issue number14
Online published19 Jun 2009
Publication statusPublished - 20 Jul 2009
Externally publishedYes

Abstract

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) bis[2-(2,4-difluorophenyl)pyridinato-N,C2′] quinaldinate (1) and iridium(III) bis[2-(2,4-difluorophenyl)pyridinato-N,C2′]- [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 (<300 ps) and a single exponential decay. Further single wavelength as well as full spectrum of femto-picosecond transient absorption acquired in CH2Cl2 at room temperature reveals an ultrafast S1→Tn intersystem crossing (<1 ps) and a rapid Tn→T1 internal conversion/vibrational relaxation within a time period of <10 ps. The results lead us to conclude that following Franck-Condon excitation, the time scale required to populate the lowest triplet state should be <10 ps.

Citation Format(s)

Photophysics of Heteroleptic Iridium(III) Complexes Of Current Interest; a Closer Look on Relaxation Dynamics. / Duan, Hsin-Sheng; Chou, Pi-Tai; Hsu, Cheng-Chih; Hung, Jui-Yi; Chi, Yun.

In: Inorganic Chemistry, Vol. 48, No. 14, 20.07.2009, p. 6501-6508.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review