Iridescence-controlled and flexibly tunable retroreflective structural color film for smart displays

Wen Fan, Jing Zeng, Qiaoqiang Gan, Dengxin Ji, Haomin Song, Wenzhe Liu, Lei Shi, Limin Wu

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Structural color materials, which use nano- or microstructures to reflect specific wavelengths of ambient white light, have drawn much attention owing to their wide applications ranging from optoelectronics, coatings, to energy-efficient reflective displays. Although various structural color materials based on specular or diffuse reflection have been demonstrated, neither efficient retroreflective structural colors nor iridescent and non-iridescent colors to different observers simultaneously were reported by existing artificial or natural structural color materials. Here, we show that by partially embedding a monolayer of polymer microspheres on the sticky side of a transparent tape, the spontaneously formed interferometric structure on the surface of air-cushioned microspheres can lead to unique structural colors that remain non-iridescent under coaxial illumination and viewing conditions, but appear iridescent under noncoaxial illumination and viewing conditions. Our findings demonstrate a smart, energy-efficient, and tunable retroreflective structural color material that is especially suitable for nighttime traffic safety and advertisement display applications.
Original languageEnglish (US)
JournalScience Advances
Volume5
Issue number8
DOIs
StatePublished - Aug 9 2019
Externally publishedYes

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