Mark J Fernée et al 2004 Nanotechnology 15 1328 doi:10.1088/0957-4484/15/9/037
Mark J Fernée, Andrew Watt, Jamie Warner, Norman Heckenberg and Halina Rubinsztein-Dunlop
Show affiliationsMultiple emission peaks have been observed from surface passivated PbS nanocrystals displaying strong quantum confinement. The emission spectra are shown to be strongly dependent on the excited-state parity. We also find that intraband energy relaxation from initial states excited far above the band-edge is nearly three orders of magnitude slower than that found in other nanocrystal quantum dots, providing evidence of inefficient energy relaxation via phonon emission. The initial-state parity dependence of the photoluminescent emission properties suggests that energy relaxation from the higher excited states occurs via a radiative cascade, analogous to energy relaxation in atomic systems. Such radiative cascade emission is possible from ideal zero-dimensional semiconductors, where electronic transitions can be decoupled from phonon modes.
63.20.-e Phonons in crystal lattices
Condensed matter: electrical, magnetic and optical
Issue 9 (September 2004)
Received 28 May 2004
Published 13 August 2004
Mark J Fernée et al 2004 Nanotechnology 15 1328
Mark J Fernée et al 2004 Nanotechnology 15 1351
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