Photoinduced phase transition in single crystals of urethane-substituted polydiacetylenes

Hiroaki Tachibana, Noriko Hosaka, Masayuki Osaki, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)3969-3972
Number of pages4
JournalInternational Journal of Modern Physics B
Issue number28-30
Publication statusPublished - 2001 Dec 10
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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