Fig. 2: Emission spectroscopy of surface-guided epitaxial CsPbBr3 nanowires on C-plane sapphire.
(a) PL spectra of nanowires with different heights (indicated in the figure) excited at 458 nm. SEM-CL monochromatic images of an ensemble of nanowires with varying heights: (b) SEM image and (c–e) CL monochromatic images generated by collecting the emitted light specifically at 480, 490, and 500 nm, displaying the emission wavelength distribution of the nanowires. Spatially resolved CL spectroscopy on a single tapered nanowire: (f) SEM image, (g) CL map, (h) the extracted emission peak wavelength map with its color-scale to its right, and (i) a true RGB color map calculated from the fitted emission peak displaying the varying emission wavelength, from green to blue, with the diminishing height of the tapered nanowire.
