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Münster 1999 – scientific programme

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HL: Halbleiterphysik

HL 21: Optische Eigenschaften I

HL 21.1: Talk

Tuesday, March 23, 1999, 16:00–16:15, H3

On the charge transfer process in ZnS based ac powder electroluminescent devices — •Alexandru Oprea1,2, Dieter Schmeißer1, and A. Goldenblum21BTU Cottbus
LS Angewandte Physik - Sensorik
Erich-Weinert-Str.1
03046 Cottbus — 2Institutul National de Fizica Materialelor
Bucuresti
Romania

The charge transfer process in ZnS based ac powder electroluminescent devices was experimentally and theoretically investigated. The time dependence of active currents and the voltage dependence of the brightness were measured in different operating conditions. This data allowed the hypothesis that each ZnS grain of the ac powder electroluminescent device (PWELD) behaves as a thin films electroluminescent device (TFELD) with metal-insulator-semiconductor-insulator-metal (MISIM) structure. The whole PWELD, itself, can be considered as a sum of many litle MISIM sandwiches electrically conected among them and having the quasi Fermi level of the semiconductor-insulator interface randomly distributed.
On this basis, in the frame of a statistical Monte-Carlo like procedure, was developed a quantative semiclassical model, in good agreement with the experimental data.

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