Temperature Dependence in Emission Characteristics of an Organic EL Cell with 8‐hydroxyquinoline Aluminum Emitting Layer

Current density-voltage characteristics, luminance, and emission spectra of an organic electroluminescent (EL) cell were measured at temperatures between -160 and 20 o C. An aromatic diamine and 8-hydroxyquinoline aluminum (Alq 3 ) were used as the hole transport and the emitting layers, respectively. The EL luminance at a constant current density of 1 mA/cm 2 was found to decrease with increasing temperature, and the photoluminescence intensity of the Alq 3 powder was also found to show a similar temperature dependence