Organic electroluminescent devices with an aluminium alloy cathode, consisting of
aluminium-lithium, aluminium-calcium or aluminium-magnesium, have been examined.
From the temperature dependence of the current-voltage characteristics in metal/aluminium
complex (Alq3)/metal structure devices, the carrier-injection mechanism in the higher current
range is ascribed to thermionic (Schottky) emission and the carrier-conduction mechanism
of the Alq3 layer in the lower current range is observed to be three-dimensional variable …