Abstract：Optical limiting (OL) cycling behavior of chloroindium (Ⅲ) phthalocyanine (InPcCl) solution was investigated by repeating Z-scan measurement up to 150 times, while photostability was characterized by changes in the UV-Vis absorption spectra during the process of laser irradiation and daylight illumination. The results show that InPcCl is stable against laser irradiation, leading to its good OL cycling behavior, although it features poor stability against daylight illumination. The possible mechanism behind this difference in photostability is proposed.
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