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(a) A schematic of the devices consisting of Si3N4 circular Bragg gratings (CBGs) covered by a layer of polymethyl methacrylate (PMMA) mixed with perovskite NCs. Inset: the atomic structure of the perovskite nanocrystals (NCs). (b) The absorption and photoluminescence (PL) spectra of the NCs. Inset: transmission electron microscopy (TEM) image of perovskite NCs., the scale bar is 100 nm.
