Energy transfer and phosphorescence-quenching dynamics in a phosphorescent host-guest system

Chih Wei Chang, Rei Yun Lee, Eric Wei Guang Diau

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We investigated the energy transfer dynamics in a phosphorescent host-guest system. Two spirobifluorene derivatives, [2,7-bis(2,2-diphenylvinyl)-9,9 -spirobifluorene] (DPVSBF) and [2,7-bis(1,2,2-triphenylvinyl)- 9,9′-spirobifluorene] (TPVSBF), were doped with the red phosphor complex [Os(bpftz)2(PPh2Me)2] (Os-R). The two hosts exhibit similar host-to-guest energy transfer efficiencies; however, the backward energy transfer from the Os-R complex to TPVSBF is slower than that from Os-R to DPVSBF. Quantum chemical calculations suggest that the backward energy transfer dynamics are related to the host's triplet-state energy level. The greater energy of the TPVSBF triplet state compared to that of DPVSBF plays a crucial role in its ability to confine triplet excitons in Os-R.

Original languageEnglish
Pages (from-to)52-56
Number of pages5
JournalChemical Physics Letters
Publication statusPublished - 2013 Mar 13


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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