Photophysical study of iridium complexes by absolute photoluminescence quantum yield measurements using an integrating sphere

Kengo Suzuki, Ayataka Endo, Toshitada Yoshihara, Seiji Tobita, Masayuki Yahiro, Daisuke Yokoyama, Chihaya Adachi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

We have developed an apparatus (Hamamatsu C9920-02) for measuring the absolute photoluminescence quantum yield. This system consists of an excitation light source, a sample holder mounted in an integrating sphere and a multi-channel CCD spectrometer. Using this apparatus, the absolute phosphorescence quantum yields were measured for several iridium complexes doped in organic thin films or dissolved in deaerated solutions. The iridium complexes fac-tris(2-phenylpyridine)iridium(III) (Ir(ppy)3) and its derivatives, showed high phosphorescence quantum yields (>90 %), while bis(2-(2'-benzo(4,5-a)thienyl)pyridinato-N,C3')iridium(III) (acetylacetonate) (Btp2Ir(acac)) gave a lower phosphorescence quantum yield (less than 40 %). To reveal the mechanism of nonradiative decay of the excited iridium complexes, we made time-resolved photoacoustic measurements. It was found that all of the iridium complexes undergo S1-T1 intersystem crossing with efficiencies of close to 100 % after photoexcitation. This indicates that the lower phosphorescence quantum yield for Btp 2Ir(acac) is due to involvement of the T1-S0 intersystem crossing process.

Original languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XIII
Volume7415
DOIs
Publication statusPublished - Dec 1 2009
EventOrganic Light Emitting Materials and Devices XIII - San Diego, CA, United States
Duration: Aug 2 2009Aug 4 2009

Other

OtherOrganic Light Emitting Materials and Devices XIII
CountryUnited States
CitySan Diego, CA
Period8/2/098/4/09

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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