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Photoluminescence Spectroscopy of Single CdSe Nanocrystallite Quantum Dots

1996; American Physical Society; Volume: 77; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.77.3873

1092-0145

S. A. Empedocles, David J. Norris, Moungi G. Bawendi,

Near-Field Optical Microscopy

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.