Four photochromic dithienylethene compounds, 1, 2-bis (2-methyl-5-naphthalene-3-thienyl) perfluorocyclopentene, 1, 2-bis [2-methyl-5 (p-fluorophenyl)-3-thienyl] perfluorocyclopentene, 1, 2-bis [2-methyl-5 (p-ethoxyphenyl)-3-thienyl] perfluorocyclopentene, and 1, 2-bis [2-methyl-5 (pN, N-dimethylaminophenyl)-3-thienyl] perfluorocyclopentene were synthesized, and their optoelectronic properties, such as ...