Spin-relaxation process of excited triplet states of Ir(ppy)3

Kenichi Goushi, Jason Brooks, Julie J. Brown, Hiroyuki Sasabe, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The phosphorescence intensities of the green phosphor, fac tris(2-phenylpyridine) iridium [Ir(ppy)3], in a polymethylmethacrylate [PMMA] host matrix are independent of temperature, while the phosphorescence lifetimes increase significantly at temperatures below T ∼ 50 K. In this paper, to rationalize the characteristic temperature dependence of the transient phosphorescence of Ir(ppy)3, we propose a model where the triplet excited states split by spin-orbital interaction, forming three levels in which mutual energy transfer between the sub-levels of triplet states occurs. We discuss the validity of this numerical model by comparing with the experimental result of the transient phosphorescence in a PMMA host matrix and demonstrate that the model well explains the characteristic temperature dependence.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalJournal of Photopolymer Science and Technology
Issue number2
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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