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Fig. 7.

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Fig. 7. Schematic representation of the mechanism of PL excitation, energy transfer, and PL emission in Mn2+-doped material. The orange lines represent the energy level diagram of the Mn2+ ion in a free-ion state (right) and tetrahedrally coordinated environment (left) in a supertetrahedral nanocluster. The dotted arrows indicate nonradiative transitions. PL, photoluminescence. Reprinted with permission from Lin et al. (J Am Chem Soc 2014;136:4769-4779) [24]. Copyright 2014 American Chemical Society.
Progress in Medical Physics 2022;33:11-24 https://doi.org/10.14316/pmp.2022.33.2.11
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