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. Author manuscript; available in PMC: 2024 Mar 1.
Published in final edited form as: Adv Drug Deliv Rev. 2023 Jan 25;194:114711. doi: 10.1016/j.addr.2023.114711

Fig. 4. Preparation of multicolor ML colloidal nanocrystals by a biomineral-inspired method.

Fig. 4.

(a) The biomineral-inspired approach leverages a suppressed dissolution mechanism by learning from natural biominerals to generate ML colloids as a rechargeable internal light source under FUS stimulation. (b) Top: SEM images of (i) Sr2MgSi2O7:Eu,Dy, (ii) ZnS:Cu,Al, (iii) ZnS:Mn, and (iv) CaTiO3:Pr bulk materials synthesized by solid-state reactions. Scale bars represent 50 μm. Middle: TEM images of (i) Sr2MgSi2O7:Eu,Dy, (ii) ZnS:Cu,Al, (iii) ZnS:Mn, and (iv) CaTiO3:Pr ML colloidal nanocrystals prepared by the biomineral-inspired approach . Scale bars represent 200 nm. The luminescence images of ML bulk materials and their colloidal nanocrystals in an aqueous solution are inserted in the top and the middle rows. Bottom: size histograms of (i) Sr2MgSi2O7:Eu,Dy, (ii) ZnS:Cu,Al, (iii) ZnS:Mn, and (iv) CaTiO3:Pr colloidal nanocrystals. (c) Mechanoluminescence spectra of (i) Sr2MgSi2O7:Eu,Dy, (ii) ZnS:Cu,Al, (iii) ZnS:Mn, and (iv) CaTiO3:Pr bulk materials (left) and their corresponding colloidal nanocrystals (right). Reproduced from [68] with permission from American Chemical Society, Copyright 2022.