In this study, coating solutions were prepared by mixing waterborne polyurethane with blue light and

ultraviolet absorption dyes, applying them on the PET sheet as a substrate, and then thermosetting them to produce a

plastic films that can block blue light and ultraviolet rays at the same time. As the amount of yellow quinoline yellow

and pigment yellow 74, which are blue light absorption dyes, increased, the transmittance of high-energy blue light with

a wavelength of 400 to 450 nm decreased, improving the effect of blocking blue light. However, the addition of pigment

yellow 74 had problems that the visibility was poor because a darker yellow film was obtained than quinoline yellow,

and the visible light transmittance in the 500-800 nm region was significantly reduced. As the amount of benzotriazole

and benzophenone, which are UV absorbers, increased, the average transmittance of the coating films at a wavelength of

320-400 nm decreased significantly, resulting in a significant improvement in the UV blocking effect. However, the

increase in the amount of benzotriazole did not significantly reduce the visibility of the coating film, while the increase in the

amount of benzophenone caused the coating film to change to a dark yellow color, significantly decreasing its visibility.

Blue light, Ultaviolet ray, Blocking, Quinoline yellow, Benzotriazole

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