Low-angular-dependence dynamic structural colors enabled by Sb ₂ S ₃ phase change material

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.