Triplet exciton formation due to interaction between singlet excitons in polydiacetylene

K. Ichimura; M. Yoshizawa; H. Matsuda; S. Okada; M. M. Ohsugi; H. Nakanishi; T. Kobayashi

doi:10.1063/1.465721

Triplet exciton formation due to interaction between singlet excitons in polydiacetylene

K. Ichimura, M. Yoshizawa, H. Matsuda, S. Okada, M. M. Ohsugi, H. Nakanishi, T. Kobayashi

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

16 Citations (Scopus)

Abstract

The time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1,3- butadiyne}) on femtosecond and picosecond time scales was performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes ∼200 fs, 1 - 2 ps, and ≫200 ps. These components are assigned to the free ¹B_u excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.

Original language	English
Pages (from-to)	7404-7416
Number of pages	13
Journal	The Journal of Chemical Physics
Volume	99
Issue number	10
DOIs	https://doi.org/10.1063/1.465721
Publication status	Published - 1993 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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abstract = "The time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1,3- butadiyne}) on femtosecond and picosecond time scales was performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes ∼200 fs, 1 - 2 ps, and ≫200 ps. These components are assigned to the free 1Bu excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.",

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T1 - Triplet exciton formation due to interaction between singlet excitons in polydiacetylene

AU - Ichimura, K.

AU - Yoshizawa, M.

AU - Matsuda, H.

AU - Okada, S.

AU - Ohsugi, M. M.

AU - Nakanishi, H.

AU - Kobayashi, T.

PY - 1993/1/1

Y1 - 1993/1/1

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AB - The time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1,3- butadiyne}) on femtosecond and picosecond time scales was performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes ∼200 fs, 1 - 2 ps, and ≫200 ps. These components are assigned to the free 1Bu excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.

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