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- Temperature-dependent current-voltage characteristics of organic light-emitting diodes(OLEDs) were studied in a device structure of ITO/TPD/Alq3/Al to understand conduction mechanism. The current-voltage characteristics were measured in the temperature range of 8K ∼ 300K. We analyzed an electrical conduction mechanism of the OLEDs using space-charge-limited current(SCLC) and Fowler-Nordheim tunneling. In the temperature range above 150K, the conduction mechanism could be explained by space charge limited current from the inversely proportional temperature dependence of exponentm`