Modulation and Excitation of the Infrared Luminescence of ZnS(Cu) by Electric AC Fields

TLDR: In this article, the infrared luminescence of ZnS(Cu) due to internal transitions within the 3d9 configuration of Cu2+ ions excited by radiation may be modulated by electric ac fields (field modulation).

Abstract: The infrared luminescence of ZnS(Cu) due to internal transitions within the 3d9 configuration of Cu2+ ions excited by radiation may be modulated by electric ac fields (field modulation). The experimental data lead to the conclusion that the modulation of the emission is caused by field-induced density oscillations of free electrons within the ZnS lattice. The infrared Cu2+ emission may also be obtained without exciting radiation by the action of the electric ac field (electroluminescence). The infrared electroluminescence may be stimulated or quenched by additional irradiation. Die durch Strahlung angeregte infrarote Cu-Lumineszenz in ZnS, die von inneren Ubergangen der 3d9-Konfiguration herruhrt, last sich durch elektrische Wechselfelder modulieren (Feldmodulation). Die experimentellen Ergebnisse fuhren zu dem Schlus, das die Modulation der Emission durch Oszillationen der Dichte freier Elektronen im elektrischen Feld verursacht wird. Die infrarote Cu2+-Emission kann ohne Strahlung durch die alleinige Wirkung eines elektrischen Wechselfeldes angeregt werden (Elektrolumineszenz). Die infrarote Elektrolumineszenz last sich durch zusatzliche Bestrahlung verstarken oder abschwachen.