Perovskite nanocrystals in block copolymer photonic crystal films for dual-responsive anticounterfeiting
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Metal halide perovskite nanocrystals (PeNCs) are emerging as attractive materials for photonic and optoelectronic applications because of its outstanding photoluminescence (PL) properties. Although tremendous efforts have been made for synthesizing PeNCs, most of them were complicated and time-consuming process. In this work, through simple and time efficient two-step process, highly luminescent PeNCs could be obtained in nano domain of block copolymer (BCP) photonic crystal (PC) films. Structural color of BCP PCs is changed by crosslinking concurrently with crystallization of PeNCs. Combining PL of PeNCs and structural color of BCP PCs, dual-responsive anticounterfeiting devices in which the information can be decrypted by two kinds of stimuli, ultraviolet light and liquids which can swell P2VP domain are achieved.