A large and wide peak occurred of XRD chart at an angle of 2θ ≈ 20.8°.

The phase crystallinity indicates the amorphous nature of the PM-355 polymer sheets.

The absorption edge is randomly shifted to longer wavelengths.

Defects and atomic or molecular clusters affect the optical characteristics of the detectors.

Fluorescence spectra of the detectors show three prominent peaks at approximately 350, 420, and 470 nm, respectively.