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

A simulation of alternating-current thin-film electroluminescent devic e operation with positive space charge present in the phosphor layer o f the device is presented. The simulation is based on modeling the spa ce-charge distribution using a single-sheet charge model. The simulati on is performed for two cases of space-charge creation: by impact ioni zation of deep levels in the phosphor or by field emission from traps in the phosphor. Results of the simulation show that space-charge crea tion by either mechanism is capable of causing overshoot in both capac itance-voltage and internal charge-phosphor field (Q-F-p) plots. (C) 1 995 American Institute of Physics.