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Proceedings Paper

Improving CdS quantum-dot materials by the sol-gel method
Author(s): Chia-Yen Li; Yu-Hua Kao; Kazutaka Hayashi; Toshimi Takada; John D. Mackenzie; Koo Il Kang; San-Goo Lee; Nasser Peyghambarian; Masayuki Yamane; Guang-Wen Zhang; S. Iraj Najafi
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Paper Abstract

In this paper we discuss our approaches and results for the preparation of improved semiconductor quantum dot materials by the sol-gel method. By taking advantage of the low- temperature sol-gel route, the nanostructure and optical properties of CdS quantum dots were greatly improved for device applications. Pore-free sodium borosilicate (NBS) glasses and organically modified silicates (ORMOSILs) were used as matrices for the CdS nanocrystallites. Results from both degenerate four-wave mixing and pump-probe techniques indicated large third-order nonlinear responses of the order of 10-6 esu from CdS-doped NBS glasses. By using potassium ion exchange, the first CdS-doped channel waveguides were fabricated in NBS glasses. Propagation of femtosecond laser pulses through the waveguide was investigated. Pulse breakup effect that may be the result of soliton formation was observed in these waveguides. Polydimethylsiloxane (PDMS) was uses as the organic component to modify the silica gel. CdS-doped ORMOSILs derived from the PDMS- TEOS system exhibits improved mechanical property and film-forming ability compared to purely inorganic gels. Both CdS-doped PDMS-TEOS ORMOSILs and NBS glasses were much more resistant to photodarkening than the glasses made by melting. The use of the bifunctional ligand 3-aminopropyltriethoxysilane (APTES) significantly reduced the average particle size and narrowed the size distribution of CdS quantum dots in silica gels and densified NBS glasses.

Paper Details

Date Published: 13 October 1994
PDF: 12 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188946
Show Author Affiliations
Chia-Yen Li, MicroTouch Systems, Inc. (United States)
Yu-Hua Kao, Univ. of California/Los Angeles (United States)
Kazutaka Hayashi, Univ. of California/Los Angeles (Japan)
Toshimi Takada, Univ. of California/Los Angeles (Japan)
John D. Mackenzie, Univ. of California/Los Angeles (United States)
Koo Il Kang, Princeton Univ. (United States)
San-Goo Lee, Optical Sciences Ctr./Univ. of Arizona (United States)
Nasser Peyghambarian, Optical Sciences Ctr./Univ. of Arizona (United States)
Masayuki Yamane, Tokyo Institute of Technology (Japan)
Guang-Wen Zhang, Ecole Polytechnique de Montreal (Canada)
S. Iraj Najafi, Ecole Polytechnique de Montreal (Canada)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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