Low-angular-dependence dynamic structural colors enabled by Sb2S3 phase change material
Abstract:
Dynamic structural color based on phase change materials in visible wavelength is of great significance for the development of dynamic color filters and advanced display technology, in which angular effect is still a major challenge. This study proposes a five-layer asymmetric Fabry-Pérot cavity structure based on phase change material (Sb2S3) to generate high-purity, low-angular-dependence tunable structural colors. Experimentally achieved red, orange, and yellow colors exhibit high purity (>90%), with minimal spectral shift (<10 nm) at a 60° incident angle. By changing the structural phase of Sb2S3 from amorphous to crystalline, the red, orange, and yellow samples can be transformed into black, brown, and orange, respectively. This work features a simple structure and outstanding color performance, making it promising for application in various scenarios, including display technology and anti-counterfeiting labels.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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