A disordered hopping model of charge carriers at the organic/organic interface in bilayer organic lightemitting diodes is presented. The influences of the variation of electric field, barrier height, efficient hopping is determined by the effective barrier height at the organic/organic interface, at the same time the field strength recombination efficiency increases with effective hopping distance and applied voltage increasing, when the applied when the differences of electric strength at the organic/organic interface is very small, with the difference increasing the recombination efficiency increases; on the contrary, when the difference increasing the recombination efficiency increases; on the contrary, when the difference of electric strength reaches the critical value, recombination efficiency decreases with the increase of differences of electric strength. This model might explain the relative experimental phenomena.%本文建立了双层有机电致发光器件中载流子在有机/有机界面复合的无序跳跃理论模型.计算表明:①内界面处电子和空穴的有效势垒高义决定OLEDs中的电子和空穴密度的分布,而电子与空穴密度又决定了电场强度的大小;且复合效率随着有效势垒高度的增加而增加;②当电压较低时,复合效率随载流子有效跳跃距离的增加而增加;当电压较高时,复合效率随载流子的有效跳跃距离的增加而减少;③当界面场强差较小时,有机层界面场强突变增大,复合效率增大,当界面场强差达临界值时,复合效率反而随着界面场强差的增大而减小.该理论模型可较好地解释相关的实验现象.
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