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

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

doi:10.1016/j.cplett.2013.01.038

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

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	52-56
Number of pages	5
Journal	Chemical Physics Letters
Volume	561-562
DOIs	https://doi.org/10.1016/j.cplett.2013.01.038
Publication status	Published - 2013 Mar 13

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Energy transfer and phosphorescence-quenching dynamics in a phosphorescent host-guest system",

abstract = "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.",

author = "Chang, {Chih Wei} and Lee, {Rei Yun} and Diau, {Eric Wei Guang}",

year = "2013",

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doi = "10.1016/j.cplett.2013.01.038",

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AU - Chang, Chih Wei

AU - Lee, Rei Yun

AU - Diau, Eric Wei Guang

PY - 2013/3/13

Y1 - 2013/3/13

N2 - 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.

AB - 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.

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