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Fig. 1 | Journal of Nanobiotechnology

Fig. 1

From: 808 nm-activable core@multishell upconverting nanoparticles with enhanced stability for efficient photodynamic therapy

Fig. 1

a Transmission EM (TEM) micrographs of the layer by layer process from cores (left) to the multishell particles (right). Scale bars correspond to 50 nm. The corresponding histograms for the synthetic steps are depicted in green bars below each image. b Table reflecting UCNPs composition, including the diameter or thickness of the core or the layer based on TEM images, and the individual core and shell composition as determined by ICP-MS. c Schematic representation of the upconversion mechanism of the multi-shell nanoplatforms. d Photographs of solutions of cores (left) and core@multishell UCNPs (right) under with a 980 nm- and 808 nm-excitation lasers, respectively. e Emission spectra of cores (black lines) and core@multishell UCNPs (green lines) in chloroform (~ 5 nM particles) under 808 nm and 980 nm excitation (1 W cm−2), respectively

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