FERNÉE, Mark J.; SINITO, Chiara; MULVANEY, Paul; TAMARAT, Philippe; LOUNIS, Brahim

doi:10.1039/c4cp02

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FERNÉE, Mark J.
lp2n-01,lp2n-12

SINITO, Chiara
lp2n-01,lp2n-12

MULVANEY, Paul
School of Chemistry [Melbourne]

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Physical Chemistry Chemical Physics. 2014-08-28, vol. 16, n° 32, p. 16957-16961

Royal Society of Chemistry

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The direct coupling of excited electronic states to optical phonons in single CdSe colloidal quantum dots is explored using both photoluminescence emission and excitation spectroscopies. We find a broad optical phonon spectrum associated with a single fine structure state. Multiple peaks in the optical phonon sideband are ascribed to different optical phonon types emanating from both the core and shell layers. A mixed emission process that involves the simultaneous generation of two different types of optical phonon is also observed. In general, rather than a single mode, each designated phonon type is associated with a dispersed family of modes. Narrow optical phonon sidebands, consistent with the dominant LO mode, are observed in some nanocrystals. A linewidth analysis indicates that optical phonon lifetimes are in the 10 picosecond range. We demonstrate the ability to selectively excite a specific band-edge state by directly exciting its LO phonon sideband.< Leer menos

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INTRABAND RELAXATION

NANOCRYSTALS

EXCITON

PHOTOLUMINESCENCE

SPECTROSCOPY

BOTTLENECK

EMISSION

ENERGY

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The optical phonon spectrum of CdSe colloidal quantum dots

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