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HL: Halbleiterphysik
HL 21: Optische Eigenschaften I
HL 21.1: Vortrag
Dienstag, 23. März 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. Goldenblum2 — 1BTU 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.