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Digitale Medien

Voltage-controlled electroluminescence from SiO2 films containing Ge nanocrystals and its mechanism (2000)

Zhang, J.-Y. ; Ye, Y.-H. ; Tan, X.-L. ; [weitere]

Springer

Applied physics 71 (2000), S. 299-303

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Details

ISSN: 1432-0630

Schlagwort(e): PACS: 78.60.Fi; 78.66Jg; 78.66Db

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract. Luminescent SiO2 films containing Ge nanocrystals are fabricated by using Ge ion implantation, and metal–oxide–semiconductor structures employing these films as the active layers show yellow electroluminescence (EL) under both forward and reverse biases. The EL spectra are strongly dependent on the applied voltage, but slightly on the mean size of Ge nanocrystals. When the forward bias increases towards 30 V, the EL spectral peak shifts from 590 nm to 485 nm. It is assumed that the EL originates from the recombination of injected electrons and holes in Ge nanocrystals near the Si/SiO2 interface, or through luminescent centers in the SiO2 matrix near the SiO2/metal interface. The mismatch of the injection amounts between holes and electrons results in the low EL efficiency.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s003390000518

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Digitale Medien

Chemical modification in mass spectrometry IV - 2-alkenyl-4,4-dimethyloxazolines as derivatives for the double bond location of long-chain olefinic acids (1988)

Zhang, J. Y. ; Yu, Q. T. ; Liu, B. N. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 15 (1988), S. 33-44

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Details

ISSN: 0887-6134

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Long-chain unsaturated fatty acids (UFA) can easily be converted on a microgram scale to the corresponding 2-alkenyl-4,4-dimethyloxazolines by condensation with 2-amino-2-methylpropanol (AMP). These modified molecules with a ‘hidden’ carboxyl group have been proved to be a class of useful derivatives for gas chromatography/mass spectrometry (GC/MS) of UFA mixtures. While possessing very good GC characteristics, the title compounds show regular, well-recognizable diagnostic ion peaks of the double bond position in the chain. Detailed description of the method as well as electron impact (E1) mass spectra of derivatives resulting from mono-, di and polyenoic (maximally containing six double bonds) acids are presented.

Zusätzliches Material: 5 Ill.