Fig. 2.

Unstable vs stable silicon dopant emission correlates with grain boundaries. (A) CL point spectra taken when a STEM probe at positions pt. 1 to 6, corresponding to the points in the inset BF STEM image, sale bar 200nm. (B, i) TEM image of nanodiamond in Fig. 2, ii three dark field images combined into one image, overlaid on the TEM image (C, i): 2D map of CL counts for CL wavelengths 700 to 800 nm, and (ii): for CL wavelengths 738 $\pm$ 1nm, corresponding in space to the black dashed box in (B, i), scale bars, 200 nm. Dashed lines are used as a guide to the eye to indicate roughly the underlying grain boundaries within the nanodiamond.