Figure 1

Spectroscopic measurements of methylene blue-CdTe nanocrystals solutions. Panel a normalized absorption spectrum of methylene blue dye (solid line) and photoluminescence spectra of 2.8-nm (dotted line) and 3.3-nm (dashed line) colloidal CdTe samples. The 2.8-nm NCs have much smaller spectral overlap with methylene blue. Panels b and c show the change in the absorption spectrum of b 2.8-nm and c 3.3-nm CdTe NCs with increasing dye concentration (curves “a”–”g”), respectively. There was no evidence of any major chemical changes upon the mixing of NCs and MB dye