MODELING SPACE-CHARGE IN ALTERNATING-CURRENT THIN-FILM ELECTROLUMINESCENT DEVICES USING A SINGLE-SHEET CHARGE MODEL

A simulation of alternating-current thin-film electroluminescent device operation with positive space charge present in the phosphor layer of the device is presented. The simulation is based on modeling the space-charge distribution using a single-sheet charge model. The simulation is performed for two cases of space-charge creation: by impact ionization of deep levels in the phosphor or by field emission from traps in the phosphor. Results of the simulation show that space-charge creation by either mechanism is capable of causing overshoot in both capacitance-voltage and internal charge-phosphor field (Q-F-p) plots. (C) 1995 American Institute of Physics.