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Proceedings Paper

Optical properties of CdSe[sub]1-x[/sub]S[sub]x[/sub] nanoparticles
Author(s): S. G. Raymond; D. Clarke; S. Janssens; G. V. M. Williams
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Paper Abstract

Photoluminescence (PL) and absorption measurements have been made on CdSe1-xSx nanoparticles with x=0.69 to x=1 using a process that should lead a graded sulfur fraction where the sulfur fraction is lowest in the core. There is a systematic increase in the 1S3/2→1Se transition energy and the 1Se→1S3/2 PL emission energy that can be attributed to an increasing sulfur concentration. The quantum yield is ~30% for 0.69≤x≤0.83. It decreases to 0.7% for higher values as x approaches 1. The higher quantum yields for x≤0.83 may be due to the graded sulfur concentration that leads to a thermal barrier that reduces non-radiative recombination at the surface. Temperature dependent PL measurements on a x=0.83 sample are consistent with two PL lifetimes where the longer one (~30 ns) is nearly temperature independent and could arise from a fraction of the nanoparticles having a lower concentration of non-radiative recombination sites. The shorter component can be accounted for by thermal activation to surface non-radiative recombination sites with an activation energy of 9.6 meV.

Paper Details

Date Published: 15 November 2010
PDF: 8 pages
Proc. SPIE 7847, Optoelectronic Devices and Integration III, 784704 (15 November 2010); doi: 10.1117/12.870407
Show Author Affiliations
S. G. Raymond, Industrial Research Ltd. (New Zealand)
D. Clarke, Industrial Research Ltd. (New Zealand)
S. Janssens, Industrial Research Ltd. (New Zealand)
G. V. M. Williams, Industrial Research Ltd. (New Zealand)

Published in SPIE Proceedings Vol. 7847:
Optoelectronic Devices and Integration III
Xuping Zhang; Hai Ming; Alan Xiaolong Wang, Editor(s)

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