Photoinduced phase transition in single crystals of urethane-substituted polydiacetylenes

Hiroaki Tachibana; Noriko Hosaka; Masayuki Osaki; Yoshinori Tokura

doi:10.1142/s0217979201009128

Photoinduced phase transition in single crystals of urethane-substituted polydiacetylenes

Hiroaki Tachibana, Noriko Hosaka, Masayuki Osaki, Yoshinori Tokura

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

Abstract

Thermochromic behaviors were investigated by measurements of reflectance spectra for urethane-substituted polydiacetylene crystal having side groups of R=(CH₂)₆OCONHC₂H₅(PDA-6UEt). The PDA-6UEt crystal shows an irreversible thermochromic A-to-B (blue-to-red) phase transition: the absorption band at 1.88 eV due to the lowest exciton shifts to higher energy (2.15 eV) in the heating run, but the reflectance spectra remain in the B phase even when cooled down to room temperature. We have demonstrated that photoinduced phase transition (PIPT) is observed by utilizing the irreversible A-to-B phase transition. The conversion shows the presence of a threshold of the light intensity and depends on photon energy, suggesting that the PIPT is mediated by the photogenerated electron-hole pairs.

Original language	English
Pages (from-to)	3969-3972
Number of pages	4
Journal	International Journal of Modern Physics B
Volume	15
Issue number	28-30
DOIs	https://doi.org/10.1142/s0217979201009128
Publication status	Published - 2001 Dec 10
Externally published	Yes

ASJC Scopus subject areas

Statistical and Nonlinear Physics
Condensed Matter Physics

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title = "Photoinduced phase transition in single crystals of urethane-substituted polydiacetylenes",

abstract = "Thermochromic behaviors were investigated by measurements of reflectance spectra for urethane-substituted polydiacetylene crystal having side groups of R=(CH2)6OCONHC2H5(PDA-6UEt). The PDA-6UEt crystal shows an irreversible thermochromic A-to-B (blue-to-red) phase transition: the absorption band at 1.88 eV due to the lowest exciton shifts to higher energy (2.15 eV) in the heating run, but the reflectance spectra remain in the B phase even when cooled down to room temperature. We have demonstrated that photoinduced phase transition (PIPT) is observed by utilizing the irreversible A-to-B phase transition. The conversion shows the presence of a threshold of the light intensity and depends on photon energy, suggesting that the PIPT is mediated by the photogenerated electron-hole pairs.",

author = "Hiroaki Tachibana and Noriko Hosaka and Masayuki Osaki and Yoshinori Tokura",

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T1 - Photoinduced phase transition in single crystals of urethane-substituted polydiacetylenes

AU - Tachibana, Hiroaki

AU - Hosaka, Noriko

AU - Osaki, Masayuki

AU - Tokura, Yoshinori

PY - 2001/12/10

Y1 - 2001/12/10

N2 - Thermochromic behaviors were investigated by measurements of reflectance spectra for urethane-substituted polydiacetylene crystal having side groups of R=(CH2)6OCONHC2H5(PDA-6UEt). The PDA-6UEt crystal shows an irreversible thermochromic A-to-B (blue-to-red) phase transition: the absorption band at 1.88 eV due to the lowest exciton shifts to higher energy (2.15 eV) in the heating run, but the reflectance spectra remain in the B phase even when cooled down to room temperature. We have demonstrated that photoinduced phase transition (PIPT) is observed by utilizing the irreversible A-to-B phase transition. The conversion shows the presence of a threshold of the light intensity and depends on photon energy, suggesting that the PIPT is mediated by the photogenerated electron-hole pairs.

AB - Thermochromic behaviors were investigated by measurements of reflectance spectra for urethane-substituted polydiacetylene crystal having side groups of R=(CH2)6OCONHC2H5(PDA-6UEt). The PDA-6UEt crystal shows an irreversible thermochromic A-to-B (blue-to-red) phase transition: the absorption band at 1.88 eV due to the lowest exciton shifts to higher energy (2.15 eV) in the heating run, but the reflectance spectra remain in the B phase even when cooled down to room temperature. We have demonstrated that photoinduced phase transition (PIPT) is observed by utilizing the irreversible A-to-B phase transition. The conversion shows the presence of a threshold of the light intensity and depends on photon energy, suggesting that the PIPT is mediated by the photogenerated electron-hole pairs.

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JO - International Journal of Modern Physics B

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Photoinduced phase transition in single crystals of urethane-substituted polydiacetylenes

Abstract

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