A photochromic dye was constructed by incorporation of a carbon–carbon triple bond spaced triangle terthiophene skeleton and hydroxyphenylbenzothiazole. Regular photochromic behavior was investigated with alternated UV (254 nm) and visible light (≥ 400 nm) irradiation. The color of dye in solution can be cycled between pink and colorless. Additionally, the dye solution strongly fluoresces in THF with the absolute quantum yield (QY) being 0.56. When irradiation with 254 nm light, the emissive solution can be effectively quenched to photo-stationary sate (Φ = 0.05). An emission “on–off” cycle could be established based on the UV/visible light irradiation cycle. The photochromic dye also exhibits good photo- and thermal-stability at room temperature. The emission decay profile indicates typical single component character with the fluorescence lifetime being 6.68 ns. The emission color was determined by the CIE 1931 coordinates of x = 0.14, y = 0.25 in the blue region.

通过结合碳-碳三键间隔三角形三联噻吩骨架和羟基苯基苯并噻唑构建了一种光致变色染料。用交替的紫外线 (254 nm) 和可见光 (≥ 400 nm) 照射研究了常规的光致变色行为。溶液中染料的颜色可以在粉红色和无色之间循环。此外，染料溶液在 THF 中发出强烈荧光，绝对量子产率 (QY) 为 0.56。当用254 nm的光照射时，发射溶液可以有效地猝灭到光静止状态（Φ = 0.05）。可以根据紫外线/可见光照射周期建立发射“开-关”周期。光致变色染料在室温下也表现出良好的光稳定性和热稳定性。发射衰减曲线表明典型的单组分特征，荧光寿命为 6.68 ns。发射颜色由蓝色区域中x  = 0.14、y  = 0.25 的 CIE 1931 坐标确定。