The electro-optical behavior of SrS:Ce electroluminescent devices under photonic excitation

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Abstract
The electro-optical behavior of the SrS:Ce electroluminescent devices under pulsed photonic excitation in the lower energy absorption band of Ce3+ was analyzed below the electroluminescence threshold voltage for a rectangular electric pulse. The photoluminescence quenching due to the ionization of the Ce3+ ions under the electrical field increases with the applied voltage (40% at the threshold). Delocalization of involved electrons is responsible for emissions at the trailing edge of the electric pulse and for emissions during the following pulse. These emissions do not restore the level of the photoluminescence without applied voltage. These different emissions allow detailed study of energy trap levels for each insulator/SrS interface. An interpretation of the photoluminescence quenching is proposed