Formation of chiral polydiacetylene (PDA) film using circularly polarized light (CPL) was demonstrated for the first time. Commercially available achiral derivative of diacetylene was used to prepare the vacuum evaporated monomer film and it was polymerized using ultra-violet CPL. Chiral source was only CPL, and the irradiation of left- and right-CPL definitely yielded opposite chiral polymer.

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Trapped carriers in polydiacetylene (PDA) films were directly observed by the electric field induced second harmonic generation (EFISHG) using field effect transistor (FET) structure. Response of EFISHG signal from PDA-FET with applying voltage depended strongly on the polarity of gate voltage. For negative bias, which promotes hole injection from source electrode, EFISHG signal was not observed during bias application, whereas it was enhanced after turning off the bias. Electric field formed by trapped holes in PDA activated the EFISHG signal for the negative bias condition.

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