Low-angular-dependence dynamic structural colors enabled by Sb2S3 phase change material

Tunable 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 effects is a key breakthrough. 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. The design achieves excellent angular effects due to the high refractive index and absorption characteristics of Sb2S3. Furthermore, an ultra-thin Ge layer is introduced to enhance color saturation. Experimentally achieved red, orange, and yellow colors exhibit high purity (>90%) and peak reflectance exceeding 85%, with minimal spectral shift (