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. 2018 Jul 9;8(7):511. doi: 10.3390/nano8070511

Figure 2.

Figure 2

(a) Illustration of the penetration depths for UV and NIR light [55]. (b) Photographs of tissue penetration for NIR and UV light. Slices of chicken breast with various thicknesses (2 mm–10 mm) were placed between the laser source and the glass cuvette containing the UCNP-labeled hydrogel and fluorescein (FITC)-labeled hydrogel, respectively [56]. Reproduced with permission from [55]. Copyright The Royal Society of Chemistry, 2015. Reproduced with permission from [56]. Copyright Elsevier, 2017.