Abstract
Detailed transient current response characteristics of organic light-emitting diode( OLED)were investigated. Transient current response curve can be divided into three partitions: positive current spike( IP),stead-state current( IS) and negative current spike( IN). It is found that the positive and negative current peaks correspond to the charging and discharging process of space charges near electrode / organic interface,respectively. Linear relationship between the current spikes and pulsed voltage amplitude is found. Larger INthan IPis induced by the difference between Femi level of electrode and the highest occupied orbital level( HOMO) of organic materials. Different duty-ration dual pulsed voltages are modulated to investigate the relation between current response and space charges. It is found the space charge charging and discharging threshold duty-ration is only depended on the hole injection barrier and independent with internal device structure.
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