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Electro‐Photoluminescence Color Change for Deformable Visual Encryption
Author(s) -
Lee Gilwoon,
Kong Minsik,
Park Doowon,
Park Junho,
Jeong Unyong
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907477
Subject(s) - chromaticity , photoluminescence , materials science , phosphor , optoelectronics , electroluminescence , optics , structural coloration , luminescence , encryption , computer science , nanotechnology , physics , layer (electronics) , photonic crystal , operating system
Although structural coloring and photoluminescence (PL) have been investigated for radiation‐responsive color change, electroluminescence (EL) has not been used for the radiation‐responsive system. An electro‐photoluminescence (EPL) color change is presented here. The phosphors in the alternating current electroluminescence (ACEL) act simultaneously as electro‐luminophores and photo‐luminophores. The EPL chromaticity is systematically investigated depending on the ACEL frequency and UV intensity. It is found that the PL variation depending on UV intensity is the mechanism of the EPL color change. It is revealed that EL and PL can be controlled independently in the low electric field so that the EPL chromaticity can be adjusted by a linear combination of the EL color and the PL color. The EPL color‐changing device is used as a deformable visual encryption system and a soft skin for a soft robotic rover, imitating the concealment and signaling functions in nature.