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RE-doped NPs encapsulated in aqueous droplets in a microfluidic device. Encapsulation of Eu3+-doped NPs (A) and Tb3+-doped NPs (B). Images are: (i) brightfield, (ii) fluorescence with filter set 1, (iii) fluorescence with filter set 2 and, (iv) overlay. Scale bar is 35 µm.
