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We report that the ultraviolet (UV) light induced photochromic behavior of layered organic-inorganic perovskite material of (C4H9NH3)2CuCl4, changed from yellow to brown after irradiation with UV light (10 mW/cm2) and partially recovered through storage in the dark. (C4H9NH3)2CuCl4 exhibited two distinct absorption bands centered at 286 nm (band I) and 384 nm (band II), which were attributed to the...
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