Relaxation process of CT exciton state in a one-dimensional MX-chain compound [NiBr(chxn)2]Br2

Shinya Takaishi; Hiroshi Kitagawa; Ryuichi Ikeda

Relaxation process of CT exciton state in a one-dimensional MX-chain compound [NiBr(chxn)₂]Br₂

Shinya Takaishi, Hiroshi Kitagawa, Ryuichi Ikeda

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

Abstract

Luminescence spectroscopy measurements were performed in a one-dimensional halogen-bridged transition-metal compound [NiBr(chxn)₂]Br₂ (chxn: 1R,2R-cyclohexanediamine) and its mixed-metal compound [Ni _1-xPd_xBr(chxn)₂]Br₂ with x = 0.005, 0.05, 0.33. The broad peaks were observed at 1.3 and 1.4 eV for [NiBr(chxn) ₂]Br₂, which are attributed to a relaxation of LMCT exciton state and a hot luminescence, respectively. No Stokes shift of the luminescence at 1.3 eV was observed, which shows the electron-lattice interaction (S) is weak in this system. From the temperature dependence of luminescence spectra, it was clarified that the relaxation process is continuously changed from luminescence to thermal relaxation. The luminescence peak at 1.3 eV is remarkably quenched with increase of x for [Ni _1-xPd_xBr(chxn)₂]Br₂, implying that the LMCT exciton is trapped to in-gap states caused by doped Pd³⁺.

Original language	English
Pages (from-to)	279-284
Number of pages	6
Journal	Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume	379
Publication status	Published - 2002 Dec 1
Externally published	Yes

Keywords

Charge-transfer exciton
Luminescence
MX chain
Mixed valence

ASJC Scopus subject areas

Condensed Matter Physics

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title = "Relaxation process of CT exciton state in a one-dimensional MX-chain compound [NiBr(chxn)2]Br2",

abstract = "Luminescence spectroscopy measurements were performed in a one-dimensional halogen-bridged transition-metal compound [NiBr(chxn)2]Br2 (chxn: 1R,2R-cyclohexanediamine) and its mixed-metal compound [Ni 1-xPdxBr(chxn)2]Br2 with x = 0.005, 0.05, 0.33. The broad peaks were observed at 1.3 and 1.4 eV for [NiBr(chxn) 2]Br2, which are attributed to a relaxation of LMCT exciton state and a hot luminescence, respectively. No Stokes shift of the luminescence at 1.3 eV was observed, which shows the electron-lattice interaction (S) is weak in this system. From the temperature dependence of luminescence spectra, it was clarified that the relaxation process is continuously changed from luminescence to thermal relaxation. The luminescence peak at 1.3 eV is remarkably quenched with increase of x for [Ni 1-xPdxBr(chxn)2]Br2, implying that the LMCT exciton is trapped to in-gap states caused by doped Pd3+.",

keywords = "Charge-transfer exciton, Luminescence, MX chain, Mixed valence",

author = "Shinya Takaishi and Hiroshi Kitagawa and Ryuichi Ikeda",

year = "2002",

month = dec,

day = "1",

language = "English",

volume = "379",

pages = "279--284",

journal = "Molecular Crystals and Liquid Crystals",

issn = "1542-1406",

publisher = "Taylor and Francis Ltd.",

}

TY - JOUR

T1 - Relaxation process of CT exciton state in a one-dimensional MX-chain compound [NiBr(chxn)2]Br2

AU - Takaishi, Shinya

AU - Kitagawa, Hiroshi

AU - Ikeda, Ryuichi

PY - 2002/12/1

Y1 - 2002/12/1

N2 - Luminescence spectroscopy measurements were performed in a one-dimensional halogen-bridged transition-metal compound [NiBr(chxn)2]Br2 (chxn: 1R,2R-cyclohexanediamine) and its mixed-metal compound [Ni 1-xPdxBr(chxn)2]Br2 with x = 0.005, 0.05, 0.33. The broad peaks were observed at 1.3 and 1.4 eV for [NiBr(chxn) 2]Br2, which are attributed to a relaxation of LMCT exciton state and a hot luminescence, respectively. No Stokes shift of the luminescence at 1.3 eV was observed, which shows the electron-lattice interaction (S) is weak in this system. From the temperature dependence of luminescence spectra, it was clarified that the relaxation process is continuously changed from luminescence to thermal relaxation. The luminescence peak at 1.3 eV is remarkably quenched with increase of x for [Ni 1-xPdxBr(chxn)2]Br2, implying that the LMCT exciton is trapped to in-gap states caused by doped Pd3+.

AB - Luminescence spectroscopy measurements were performed in a one-dimensional halogen-bridged transition-metal compound [NiBr(chxn)2]Br2 (chxn: 1R,2R-cyclohexanediamine) and its mixed-metal compound [Ni 1-xPdxBr(chxn)2]Br2 with x = 0.005, 0.05, 0.33. The broad peaks were observed at 1.3 and 1.4 eV for [NiBr(chxn) 2]Br2, which are attributed to a relaxation of LMCT exciton state and a hot luminescence, respectively. No Stokes shift of the luminescence at 1.3 eV was observed, which shows the electron-lattice interaction (S) is weak in this system. From the temperature dependence of luminescence spectra, it was clarified that the relaxation process is continuously changed from luminescence to thermal relaxation. The luminescence peak at 1.3 eV is remarkably quenched with increase of x for [Ni 1-xPdxBr(chxn)2]Br2, implying that the LMCT exciton is trapped to in-gap states caused by doped Pd3+.

KW - Charge-transfer exciton

KW - Luminescence

KW - MX chain

KW - Mixed valence

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M3 - Article

AN - SCOPUS:3142560012

VL - 379

SP - 279

EP - 284

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

SN - 1542-1406

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