A test sample for UV/Vis spectroscopy was prepared, as shown in Figure 3a. Transmittance was evaluated in the range of wavelength from 400 nm to 700 nm using an UV/Vis spectrometer (Evolution 600, Thermo Fisher Scientific, Waltham, MA, USA). The backing film was located on the reference cell, and the baseline was calibrated by measuring the transmittance of the backing film without a PSA layer.
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