Photoluminescence Spectroscopy of Single CdSe Nanocrystallite Quantum Dots

Abstract

We collect and spectrally resolve photoluminescence from single CdSe nanocrystallite quantum dots. The elimination of spectral inhomogeneities reveals resolution limited spectral linewidths ( $<120\ensuremath{\mu}\mathrm{eV}$ at 10 K) more than 50 times narrower than expected from ensemble measurements. Light driven spectral diffusion is observed as a form of power broadening. These studies confirm the atomiclike nature of the emitting state in CdSe nanocrystallites.