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- Title
Photoinduced Phase Transition in Single Crystals on Urethane-Sustituted Polydiacetylenes.
- Authors
Tachibana, Hiroaki; Hosaka, Noriko; Osaki, Masayuki; Tokura, Yoshinori
- Abstract
Thermochromic behaviors were investigated by measurements of reflectance spectra for urethane-substituted polydiacetylene crystal having side groups of R=(CH[sub 2])[sub 6]OCONHC[sub 2]H[sub 5] (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.
- Subjects
ACETYLENE crystals; THERMOCHROMISM; SPECTRAL reflectance
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2001, Vol 15, Issue 28-30, p3969
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979201009128