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. 2017 Aug 29;7:9724. doi: 10.1038/s41598-017-09904-9

Figure 4.

Figure 4

Absorption, photoluminescence excitation (PLE), and PL spectra of DOX-doped SDNA microneedles. (a) Absorption spectra of SDNA microneedles with various concentrations of DOX, i.e. 0, 5, 10, 20, and 30 μM (marked as SDNA, DOX 5, DOX 10, DOX 20, and DOX 30, respectively). (inset) For clarity, the absorption bands of DOX in SDNA microneedles in the wavelength range of 430–600 nm are magnified. (b) PLE spectra of DOX-doped SDNA microneedles at a fixed emission wavelength of λem = 597 nm. (c) PL spectra of DOX-doped SDNA microneedles at a fixed excitation wavelength, λex = 480 nm.