Energy relaxation in CdSe nanocrystals: the effects of morphology and film preparation
Date of this Version
1-14-2013Citation
Optics Express Vol. 21, Issue S1, pp. A15-A22 (2013)
Abstract
Ultrafast time-resolved absorption spectroscopy is used to investigate exciton dynamics in CdSe nanocrystal films. The effects of morphology, quantum-dot versus quantum-rod, and preparation of nanocrystals in a thin film form are investigated. The measurements revealed longer intraband exciton relaxation in quantum-rods than in quantum-dots. The slowed relaxation in quantum-rods is due to mitigation of the Auger-relaxation mechanism from elongating the nanocrystal. In addition, the nanocrystal thin film showed long-lived confined acoustic phonons corresponding to the ellipsoidal breathing mode, contrary to others work on colloidal systems of CdSe nanocrystals. (C) 2012 Optical Society of America
Discipline(s)
Nanoscience and Nanotechnology
Link to Full Text