Figure 4: Quantum yield and brightness equalization.
The left column depicts representative data for QDs based on size-tuned CdSe cores and the right column depicts representative data for composition-tuned cores. (a,b) Quantum yield values measured for QDs capped with different CdS shell thicknesses in organic solvents. The x axis is the extinction coefficient at 400 nm during shell growth and the y axis is QY with excitation at 400 nm. (c,d) Relative brightness measured for QDs capped with CdS and then ZnS shells with different ZnS shell thicknesses, with 400 nm excitation. (e,f) Relative brightness determined for different excitation wavelengths for two QD colours in aqueous solution. Insets show wavelength-dependent ratios of brightness.
