Fig. 1: Characterization of the elastic polymer matrices for the ML platform.

a Schematic structure (inset: ML image under the stretching motion with human hands) and b working process of the ML platform containing ZnS:Cu in the elastic polymer matrix. c The screening method of polymer matrices based on three key factors, and structure of selected five candidates. d Transmittance of the thin film as coated by each pure polymer matrix. The inset photo in d exhibits the superior transmittance of all polymer candidates by clearly identifying the word “HYU”. e Stress-strain graphs indicating the yield points of the selected polymer matrices.