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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Manufacturing process: (a) chemical solutions with different dye concentrations; (b) extrusion machine with the luminescent material embedded in the LDPE matrix; (c) blowing machine; and (d) polymer substrate coil based on LDPE doped with luminescent dye.