Fig. 4: Calculated excitonic properties of CdSe nanoplatelets.
From: Controlling light emission from semiconductor nanoplatelets using surface chemistry
a Predicted absorption linewidth of CdSe nanoplatelets passivated with a mix of acetate and sulfur as a function of ligand mixing for a range of nanoplatelet thicknesses (shown in monolayers, ML). b Maximum absorption linewidth (corresponding to 50 percent acetate and 50 percent sulfur) is shown in blue as a function of nanoplatelet (NP) thickness. Experimental linewidths are plotted for comparison. Linewidths at cryogenic temperatures from ref. 7 are shown in orange. Room-temperature experiments show thermal broadening, which is not included in our calculations. Therefore, for the sake of comparison, thermal broadening has been removed from the room-temperature experimental data by subtracting kBT ≈ 26 meV from the linewidths (data from refs. 19,20, shown in green). c Exciton dark-bright exchange splitting in acetate-passivated CdSe nanoplatelets as a function of nanoplatelet thickness d. The short-range contribution is shown in orange, the long-range in green, and the total in blue. d Temperature-dependent radiative lifetime, τavg(T), of CdSe nanoplatelets. Each curve represents a different nanoplatelet thickness, labeled by the number of monolayers. Source data are provided as a Source Data file.
