Scopus Publication Detail
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Observation of size-dependent thermalization in CdSe nanocrystals using time-resolved photoluminescence spectroscopy
Daniel C. Hannah; Nicholas J. Dunn; Sandrine Ithurria; Dmitri V. Talapin; Lin X. Chen; Matthew Pelton; George C. Schatz; Richard D. Schaller (Profiled Authors: Richard Daniel Schaller; George C Schatz)
Physical Review Letters. 2011;107(17).Abstract
We report heat dissipation times in semiconductor nanocrystals of CdSe. Specifically, a previously unresolved, subnanosecond decay component in the low-temperature photoluminescence decay dynamics exhibits longer decay lifetimes (tens to hundreds of picoseconds) for larger nanocrystals as well as a size-independent, ∼25-meV spectral shift. We attribute the fast relaxation to transient phonon-mediated relaxation arising from nonequilibrium acoustic phonons. Following acoustic phonon dissipation, the dark exciton state recombines more slowly via LO-phonon assistance resulting in the observed spectral shift. The measured relaxation time scales agree with classical calculations of thermal diffusion, indicating that interfacial thermal conductivity does not limit thermal transport in these semiconductor nanocrystal dispersions. © 2011 American Physical Society.
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