Dynamics of photoinduced gap states and self-trapped excitons in the MX chain compounds with degenerate and non-degenerate CDW ground states

H. Okamoto; Y. Shimada; Y. Kaga; Y. Oka; Masahiro Yamashita; T. Manabe; T. Mitani

doi:10.1016/S0379-6779(97)80965-4

Dynamics of photoinduced gap states and self-trapped excitons in the MX chain compounds with degenerate and non-degenerate CDW ground states

H. Okamoto, Y. Shimada, Y. Kaga, Y. Oka, Masahiro Yamashita, T. Manabe, T. Mitani

Research output: Contribution to journal › Conference article › peer-review

Abstract

We have characterized the photoinduced gap states from the photoinduced absorption (PA) spectroscopy in the halogen (X)-bridged metal (M) complexes having degenerate CDW state, ([Pt(en) ₂ ][Pt(en) ₂ X ₂ ](ClO ₄ ) ₄ :X=Cl, Br) and those having non-degenerate CDW state, ([Pd(en) ₂ ][Pt(en) ₂ X ₂ ](ClO ₄ ) ₄ :X=Br, I). In the former complexes, observed are the two midgap bands named as A and B, which have been assigned to spin-solitons, while in the latter complexes, photogenerations of solitons are suppressed. Photogenerations of polarons have been detected in both types of complexes. We have also investigated the excitation profiles of the luminescence from the self-trapped excitons, which are compared with those of the PA signals due to the gap states. The results demonstrate that the luminescence process strongly competes with the dissociation process to spin-soliton pairs followed by nonradiative recombinations.

Original language	English
Pages (from-to)	1923-1926
Number of pages	4
Journal	Synthetic Metals
Volume	86
Issue number	1 -3 pt 3
DOIs	https://doi.org/10.1016/S0379-6779(97)80965-4
Publication status	Published - 1997 Jan 1
Event	Proceedings of the 1996 International Conference on Science and Technology of Synthetic Metals, ICSM'96. Part 3 (of 3) - Snowbird, UT, USA Duration: 1996 Jul 28 → 1996 Aug 2

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0379-6779(97)80965-4

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Dynamics of photoinduced gap states and self-trapped excitons in the MX chain compounds with degenerate and non-degenerate CDW ground states. / Okamoto, H.; Shimada, Y.; Kaga, Y.; Oka, Y.; Yamashita, Masahiro; Manabe, T.; Mitani, T.

In: Synthetic Metals, Vol. 86, No. 1 -3 pt 3, 01.01.1997, p. 1923-1926.

Research output: Contribution to journal › Conference article › peer-review

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title = "Dynamics of photoinduced gap states and self-trapped excitons in the MX chain compounds with degenerate and non-degenerate CDW ground states",

abstract = " We have characterized the photoinduced gap states from the photoinduced absorption (PA) spectroscopy in the halogen (X)-bridged metal (M) complexes having degenerate CDW state, ([Pt(en) 2 ][Pt(en) 2 X 2 ](ClO 4 ) 4 :X=Cl, Br) and those having non-degenerate CDW state, ([Pd(en) 2 ][Pt(en) 2 X 2 ](ClO 4 ) 4 :X=Br, I). In the former complexes, observed are the two midgap bands named as A and B, which have been assigned to spin-solitons, while in the latter complexes, photogenerations of solitons are suppressed. Photogenerations of polarons have been detected in both types of complexes. We have also investigated the excitation profiles of the luminescence from the self-trapped excitons, which are compared with those of the PA signals due to the gap states. The results demonstrate that the luminescence process strongly competes with the dissociation process to spin-soliton pairs followed by nonradiative recombinations. ",

author = "H. Okamoto and Y. Shimada and Y. Kaga and Y. Oka and Masahiro Yamashita and T. Manabe and T. Mitani",

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T1 - Dynamics of photoinduced gap states and self-trapped excitons in the MX chain compounds with degenerate and non-degenerate CDW ground states

AU - Okamoto, H.

AU - Shimada, Y.

AU - Kaga, Y.

AU - Oka, Y.

AU - Yamashita, Masahiro

AU - Manabe, T.

AU - Mitani, T.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - We have characterized the photoinduced gap states from the photoinduced absorption (PA) spectroscopy in the halogen (X)-bridged metal (M) complexes having degenerate CDW state, ([Pt(en) 2 ][Pt(en) 2 X 2 ](ClO 4 ) 4 :X=Cl, Br) and those having non-degenerate CDW state, ([Pd(en) 2 ][Pt(en) 2 X 2 ](ClO 4 ) 4 :X=Br, I). In the former complexes, observed are the two midgap bands named as A and B, which have been assigned to spin-solitons, while in the latter complexes, photogenerations of solitons are suppressed. Photogenerations of polarons have been detected in both types of complexes. We have also investigated the excitation profiles of the luminescence from the self-trapped excitons, which are compared with those of the PA signals due to the gap states. The results demonstrate that the luminescence process strongly competes with the dissociation process to spin-soliton pairs followed by nonradiative recombinations.

AB - We have characterized the photoinduced gap states from the photoinduced absorption (PA) spectroscopy in the halogen (X)-bridged metal (M) complexes having degenerate CDW state, ([Pt(en) 2 ][Pt(en) 2 X 2 ](ClO 4 ) 4 :X=Cl, Br) and those having non-degenerate CDW state, ([Pd(en) 2 ][Pt(en) 2 X 2 ](ClO 4 ) 4 :X=Br, I). In the former complexes, observed are the two midgap bands named as A and B, which have been assigned to spin-solitons, while in the latter complexes, photogenerations of solitons are suppressed. Photogenerations of polarons have been detected in both types of complexes. We have also investigated the excitation profiles of the luminescence from the self-trapped excitons, which are compared with those of the PA signals due to the gap states. The results demonstrate that the luminescence process strongly competes with the dissociation process to spin-soliton pairs followed by nonradiative recombinations.

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JF - Synthetic Metals

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ER -

Dynamics of photoinduced gap states and self-trapped excitons in the MX chain compounds with degenerate and non-degenerate CDW ground states

Abstract

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