We extract the room temperature homogeneous linewidth for 5 sizes of CdSe/CdS/ZnS nanocrystals from the temperature dependence of the ensemble emission spectra. We find that the homogeneous linewidth scales as 1/R2 for small nanocrystals as is expected for acoustic phonon scattering. We analyze the contributions of an inhomogeneous size distribution, spectral diffusion, and the homogeneous linewidth to the NC ensemble spectrum at room temperature.

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