Figure 1.

(a) CdSe/ZnS core/shell QDs with CdSe core diameters ranging from 6.9 nm to 1.8 nm in diameter emitting with peaks from 1.9–2.8 eV (655–443 nm) from left to right under UV illumination. Adapted with permission from [20]; (b) Bandgap energy increases as the nanocrystal size decreases. Reprinted with permission from [38]; (c) Absorption (top) and emission (bottom) spectra of CdSe quantum dots. Reprinted with permission from [39]. Copyright (2010) American Chemical Society.