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- W2007293474 abstract "The photoluminescence of Se single crystals was investigated at 4 K under the influence of ac and dc electric fields. From the results followed a classification of the seven lines into two groups with different behaviour. The luminescence of one group is quenched in an electric field while that of the other group is amplified. This effect as well as the already known temperature behaviour of the luminescence are explained assuming an indirect energy gap of 1.91 eV and two impurity levels. There are traps for holes 29 meV above the valence band and a smaller number of traps for electrons 24.5 meV below the conduction band. An kristallinem Selen wurde bei 4 K die Lumineszenz im elektrischen Feld untersucht. Das Verhalten bei angelegter Gleich- und Wechselspannung ergab eine Einteilung der sieben Lumineszenzlinien in zwei Gruppen mit sehr unterschiedlichem Verhalten. Die Lumineszenz der einen Gruppe wird im elektrischen Feld stark erniedrigt während die der anderen verstärkt wird. Zur Erklärung dieses Verhaltens und der früher beobachteten Temperaturbhängigkeit der Lumineszenz wird ein Modell vorgeschlagen, das in einer indirekten Energielücke von 1,91 eV zwei Störstellenniveaus berücksichtigt. Löcherhaftstellen liegen 29 meV über dem Valenzband; 24,5 meV unter dem Leitungsband liegen in geringerer Anzahl Elektronenhaftstellen." @default.
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- W2007293474 date "1973-08-16" @default.
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- W2007293474 title "Electrophotoluminescence of trigonal selenium single crystals" @default.
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- W2007293474 doi "https://doi.org/10.1002/pssa.2210180211" @default.
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