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论文类型：期刊论文

发表时间：2018-04-19

发表刊物：ADVANCED OPTICAL MATERIALS

收录刊物：SCIE、EI

卷号：6

期号：8

ISSN号：2195-1071

关键字：anticounterfeiting; colored plastics; inverse opal; photonic crystals; structural color

摘要：Iridescent and metallic structural colors originating from 3D photonic crystals (3DPCs) based on Bragg's law of diffraction have attracted considerable attention in recent years. The distinctive optical properties of the material promise tremendous potential in anticounterfeiting fields. However, the poor durability and device-assisted detection of 3DPCs still limit the material's practical application. To overcome these inherent limitations, a novel iridescent flexible polyvinylidene fluoride (PVDF) plastic film with a 3D inverse opal (3DIO) structure is prepared for the anticounterfeiting of banknotes. The excellent durability of the plastic film is due to the intrinsic robust properties of PVDF resin. Patterns can be easily printed on the plastic films by pressing method. The patterned colored PVDF film changes into six distinct color states when the viewing angle increases from 5 degrees to 45 degrees, and the color switching requires no external stimuli, which makes the plastic films a higher security-level material. Given their excellent mechanical properties, the colored films can serve as an ideal candidate for anticounterfeiting materials.