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基于高场下电荷的注入过程及激子的解离和复合过程 ,建立了单层有机发光器件电致发光 (EL)效率的理论模型。计算表明 :(1)当金属 /有机界面势垒高度大于 0 .3eV时 ,器件的EL效率很低 ,降低金属 /有机界面势垒可以显著提高器件的EL效率 ;(2 )在较低偏压下 ,注入过程对器件的电致发光效率起主要作用 ,但在高偏压下复合过程起支配作用。这一模型可以阐明注入和复合过程对有机发光器件EL效率的影响 ,对选择发光材料、优化器件结构和提高器件EL效率具有指导意义。
Based on the charge injection process and exciton dissociation and recombination processes under high field, a theoretical model of electroluminescence (EL) efficiency for single-layer organic light-emitting devices was established. The calculated results show that: (1) the EL efficiency of the device is very low when the barrier height of the metal / organic interface is greater than 0.3 eV, and the metal / organic interface barrier can significantly improve the EL efficiency of the device; (2) , The injection process plays a major role in the electroluminescence efficiency of the device, but the composite process plays a dominant role under high bias. This model can clarify the influence of the injection and recombination processes on the EL efficiency of the organic light-emitting device, which is of guiding significance for selecting the light-emitting material, optimizing the structure of the device and improving the EL efficiency of the device.