By applying large A.C. square voltages to double-layer ITO/α-NPD/Alq3/Al devices, we studied the generation of electroluminescence (EL) in terms of the carrier injection and transport. The EL intensity gradually decayed with the increase of the frequency of the applied A.C. square voltage, and reached a minimum at the frequency corresponding to the carrier transit time. Interestingly, the EL intensity was again increased by the application of further higher frequency A.C. square voltages, relying on the D.C. component of the A.C. square voltages. The results suggested the presence of two EL modes. Using the Maxwell-Wagner effect model analysis, we proposed a model that accounts for the presence of two EL modes.
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