Temperature-dependent current-voltage characteristics of organic light-emitting diodes(OLEDs) were studied in a device structure of ITO/TPD/A1g3/Al. The OLEDs were based on the molecular compounds, N,N'-diphenyl-N,N'-bis(3- methylphenyl)-1,1'-diphenyl...
Temperature-dependent current-voltage characteristics of organic light-emitting diodes(OLEDs) were studied in a device structure of ITO/TPD/A1g3/Al. The OLEDs were based on the molecular compounds, N,N'-diphenyl-N,N'-bis(3- methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD) as a hole transport and tris(8-hydroxyquinoline) aluminum (Alg3) as an electron transport and emissive material. The current-voltage characteristics were measured in the temperature range of 10K and 300K. We analyzed an electrical conduction mechanism of the OLEDs using space-chargelimited current(SCLC) and Fowler-Nordheim tunneling.