Abstract
AbstractThe extensive exposure of the human epidermis to solar radiation creates a health risk that results in skin cancer. Commercial sunscreens offer sufficient protection from ultraviolet (UV) radiation; however, the ability to determine UV exposure limits can provide informed decisions about the dose of sunscreen required and the frequency of re‐application. Here, a wide range of wearable devices that colorimetrically report on UV exposure are developed. Under UV radiation, UV‐sensitive dyes change their color from 280 to 400 nm in the visible spectrum. By correlating the current color value and the UV dose, the amount of sun exposure is determined with an accuracy of 95%. A smartphone camera algorithm is coded to automatically perform the color analysis of these dyes. The UV‐sensitive dyes are incorporated in wearable devices, skin patches, textiles, contact lenses, and tattoo inks. The developed wearable devices will ensure monitoring UV radiation to rationally manage the user's behavior in order to prevent harmful sun exposure.
Highlights
The extensive exposure of the human epidermis to solar radiation creates a health risk that results in skin cancer
Www.advancedsciencenews.com www.advopticalmat.de the triphenylmethyl dyemethyl leucobase) so that the leucobase is transformed from its amino to its imino form and changes color
To assess the functionality of UV sensitive dyes as a dosimeter, the samples were irradiated with UVA/-B and D65 light sources to induce a color change
Summary
The photosensitive agent (a triphenylsulfonium or diphenyliodonium ion) triggers a hydride transfer from. The red RGB component (Figure 4c) remains constant during irradiation with ultraviolet light, while the values of green and blue decrease in the same ratio for 200 min, proving the results of Figure 4b and this combination of RGB values result in a brown color of the UV-dye. The reflected spectrum of the UV sensitive dye S is presented in Figure 5a and appears to have a white color without irradiation, but turns to purple color with continuous exposure. Further tests should determine the sensitivity, the detection limit, and long-time stability
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