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Study of the factors affecting the broadening of the photoluminescence spectra of InGaAs/InP quantum wires (1994)

Notomi, M. ; Okamoto, M. ; Tamamura, T.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 75 (1994), S. 4161-4166

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The origin of the observed large half width of photoluminescence spectra for InGaAs/InP quantum wires fabricated by electron beam lithography and reverse-mesa wet etching have been investigated. First, we studied size fluctuations in the fabricated wires using an atomic force microscope. We also studied other factors that can affect the photoluminescence half width. We found that the interface carrier concentration and size fluctuations play dominant roles in shaping the luminescence spectrum for wires narrower than 200 A(ring). For wider wires, the carrier concentration was found to be a factor in the broadening. These results indicate that a large half width itself does not directly mean a degradation of device performance, but the amount of size fluctuations limits it.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.355998

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Surface modification by calcium ions—Effect on chromatographic properties of silica (1994)

Okamoto, M. ; Nobuhara, K. ; Ishii, D.

Springer

Chromatographia 39 (1994), S. 29-34

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ISSN: 1612-1112

Keywords: Column liquid chromatography ; Calcium modified silica ; Calcium adsorption isotherms

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Summary The modification of silica surfaces by calcium ions has been studied by high-performance liquid chromatography. After treatment at pH 7.0 and 9.0 with calcium hydroxide, the modified silicas were characterised by physical and chemical analysis. From measurements by atomic absorption, the amount of calcium adsorbed was 650 ppm on silica modified at pH 7.0, and 4800 ppm on silica modified at pH 9.0. The amount of calcium on the modified silica was 0.574 groups nm−2 at pH 9.0 (original silica: mean pore diameter 176 Å, specific surface 279 m2 g−1, pore volume 1.23 ml g−1, mean particle size 9.8 μm). On the other hand, the amount of calcium in the original silica was 58 ppm. The separation factor, α for N-methylaniline and N,N-dimethylaniline was 5.2 on silica modified at pH 9.0, but could not be measured on silica modified at pH 7.0 and the original silica, using iso-propyl alcohol—n-hexane (0.5∶99.5) eluent.