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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/228

Title: Origin of the Enhanced Photoluminescence from Semiconductor CdSeS Nanocrystals
Authors: Sarma, D D
Nag, Angshuman
Santra, Pralay K
Kumar, Akshay
Sapra, Sameer
Mahadevan, Priya
Issue Date: 2010
Publisher: Journal of Physical Chemistry Letters
Citation: D. D. Sarma, A. Nag, P. Santra, A. Kumar, S. Sapra and P. Mahadevan, Origin of enhanced photoluminescence from semiconductor CdSeS nanocrystals, Journal of Physical Chemistry Letters, 2010, 1, 2149
Abstract: Internal structures of extraordinarily luminescent semiconductor nanoparticles are probed with photoelectron spectroscopy, establishing a gradient alloy structure as an essential ingredient for the observed phenomenon. Comparative photoluminescence lifetime measurements provide direct evidence for a minimization of nonradiative decay channels because of the removal of interfacial defects due to a progressive change in the lattice parameters in such graded structures, exhibiting a nearly single-exponential decay. Quantum mechanical calculations suggest a differential extent of spatial collapse of the electron and the hole wave functions in a way that helps to enhance the photoluminescence efficiency, while at the same time increasing the lifetime of the excited state, as observed in the experiments
URI: http://hdl.handle.net/123456789/228
Appears in Collections:2010

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