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Proceedings Paper

Red luminescence from Si quantum dots embedded in SiOx films grown with controlled stoichiometry
Author(s): Z. T. Kang; B. Arnold; C. J. Summers; B. K. Wagner
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Paper Abstract

Silicon quantum dot (QD) based luminescent structures can emit throughout the visible region by controlling their size and/or the host matrix. Consequently, multiple sized Si QDs embedded in thin films could be used to produce efficient white light sources, when integrated with a blue/UV LED, and film structures designed for high light extraction. In this paper, we report strong red photoluminescence from Si QDs embedded in films prepared by thermal evaporation of SiO in vacuum or an O2 atmosphere. The SiOx film composition (1.0< x <1.9) was controlled by varying the deposition rate and the oxygen flow rate in the chamber. After annealing at 1100°C, silicon nanocrystals of 20nm to 2nm in size were formed in films with different stroichiometry, as indicated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterization. Red photoluminescence was observed from films with Si QDs smaller than ~5nm, and attributed to confined carrier radiative recombination in the Si QDs. The emission peak shifted from 840nm to 745nm with increasing O2 flow rate due to a decrease in the size of the Si QDs.

Paper Details

Date Published: 14 September 2005
PDF: 8 pages
Proc. SPIE 5941, Fifth International Conference on Solid State Lighting, 59411F (14 September 2005); doi: 10.1117/12.624969
Show Author Affiliations
Z. T. Kang, Georgia Tech Research Institute (United States)
B. Arnold, Fort Valley State Univ. (United States)
C. J. Summers, Georgia Tech Research Institute (United States)
B. K. Wagner, Georgia Tech Research Institute (United States)

Published in SPIE Proceedings Vol. 5941:
Fifth International Conference on Solid State Lighting
Ian T. Ferguson; John C. Carrano; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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