Abstract
Photoluminescence of poly(3-alkylthiophene) gel in the expanded state in chloroform is much enhanced compared with that in the shrunken state in ethanol. Enhancement of photoluminescence is more remarkable in the gel with larger volume change. That is, the change of the luminescence intensity associating with volume instability is interpreted to be due to the change of the inter-chain distance but not simply the environmental solvent effect. From the in-situ X-ray diffraction measurement of poly(3-alkylthiophene) the inter-chain distance of the gel is confirmed to increase accompanying with volume increase. These results suggest that the volume change of poly(3-alkylthiophene) gel and their luminescence change associating with the volume instability are originated in the changes of inter-chain interaction and the probability of the radiative recombination of photo-excited species depending on the inter-chain distance.
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