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Preparation of amorphous phase of a photochromic dye, cis-1,2-dicyano-1,2- bis(2,4,5-trimethyl- 3-thienyl) ethene, has been investigated and its photochromic properties have been studied. This photochromic dye shows clear photochromism in the amorphous solid state accompanying reversible changes in absorption spectrum, refractive index, and dielectric properties. Clear optical pattern formation has been achieved on the amorphous dye layer.

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Photoconduction of a conducting polymer, poly(9,9-dihexadecylfluorene) containing a photochromic dye, cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene, is suppressed upon photoisomerization of the dye from ring-open form to ring-closed form but recovered by the reverse photoisomerization. The reversible memory effect in the photoconduction has been discussed on the basis of the energy states of the dye and those trapping effects on the photo-carriers in the conducting polymer.

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