Han, Hyowon Oh, Jin Woo Lee, Hyeokjung Lee, Seokyeong Mun, Seungsoo Jeon, Seungbae Kim, Dongjun Jang, Jihye Jiang, Wei Kim, Taebin Jeong, Beomjin Kim, Jiwon Ryu, Du Yeol Park, Cheolmin 2024-01-19T08:02:03Z 2024-01-19T08:02:03Z 2024-01-18 2024-04 0935-9648 https://pubs.kist.re.kr/handle/201004/113000 Optical encryption using coloration and photoluminescent (PL) materials can provide highly secure data protection with direct and intuitive identification of encrypted information. Encryption capable of independently controlling wavelength-tunable coloration as well as variable light intensity PL is not adequately demonstrated yet. Herein, a rewritable PL and structural color (SC) display suitable for dual-responsive optical encryption developed with a stimuli-responsive SC of a block copolymer (BCP) photonic crystal (PC) with alternating in-plane lamellae, of which a variety of 3D and 2D perovskite nanocrystals is preferentially self-assembled with characteristic PL, is presented. The SC of a BCP PC is controlled in the visible range with different perovskite precursor doping times. The perovskite nanocrystals developed in the BCP PC are highly luminescent, with a PL quantum yield of approximate to 33.7%, yielding environmentally stable SC and PL dual-mode displays. The independently programmed SC and PL information is erasable and rewritable. Dual-responsive optical encryption is demonstrated, in which true Morse code information is deciphered only when the information encoded by SCs is properly combined with PL information. Numerous combinations of SC and PL realize high security level of data anticounterfeiting. This dual-mode encryption display offers novel optical encryption with high information security and anti-counterfeiting. Both wavelength-tunable coloration and light intensity-tunable photoluminescence are independently and reliably manipulated in the thin polymer-based film. A rewritable dual-responsive encryption display that has the benefit of direct and intuitive identification of encrypted information by the human eye is presented, enabling high information security and anti-counterfeiting.image English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Rewritable Photoluminescence and Structural Color Display for Dual-Responsive Optical Encryption Article 10.1002/adma.202310130 1 Advanced Materials, v.36, no.14 Advanced Materials 36 14 N scie scopus 001136472300001 2-s2.0-85181253595 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article PEROVSKITE SINGLE anti-counterfeiting techniques block copolymers metal halide perovskites optical encryption photoluminescence photonic crystals structural color