Temperature and crystal size dependence of excitonic absorption for polydiacetylene microcrystals

Hideyuki Katagi, Hidetoshi Oikawa, Shuji Okada, Hitoshi Kasai, Akira Watanabe, Osamu Ito, Yasuo Nozue, Hachiro Nakanishi

Research output: Contribution to journalConference articlepeer-review

29 Citations (Scopus)


The excitonic absorption of well defined polydiacetylene microcrystals was measured as a function of temperature and crystal size. Poly-DCHD microcrystals were prepared by a recently reported reprecipitation method, and crystal size was controlled by changing the concentration of diacetylene monomer solution injected into water. The excitonic absorption peak position was blue-shifted from 650 nm to 635 nm with decreasing crystal size from 120 nm to 30 nm. On the other hand, the peak position was red-shifted by 15 nm (300 cm-1) upon decreasing the temperature from 273 K to 4 K. Narrowing of the half peak width was also observed to accompany this red-shift. These phenomena are considered to be related to the coupling interaction between the excitonic state and phonons depending on crystal size and temperature.

Original languageEnglish
Pages (from-to)285-290
Number of pages6
JournalMolecular Crystals and Liquid Crystals
Publication statusPublished - 1998
EventProceedings of the 1998 TAPPI Metered Size Press Forum - New Orleans, LA, USA
Duration: 1998 Apr 301998 May 2


  • Absorption spectrum
  • Crystal size
  • Exciton
  • Microcrystal
  • Phonon
  • Polydiacetylene


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