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在陷阱电荷限制电流传导理论的基础上 ,提出了双层有机电致发光器件的数值模型 ,研究了结构为“阳极 /空穴输运层 ( HTL) /发光层 ( EML) /阴极”的器件中电流密度和量子效率随有机层的特征陷阱能量、陷阱密度和载流子迁移率的依赖关系 .研究发现 ,对于给定的 HTL 和 EML 的特征陷阱能量、陷阱密度和载流子迁移率 ,存在一个最优的 HTL 和 EML 之间的厚度比率 ,在此最优厚度比下 ,器件的电流密度和量子效率达到最大 .通过有机层厚度的优化 ,器件的电流密度和量子效率可提高多达两个数量级 .另外 ,还研究了最优厚度比随有机层特征陷阱能量、总陷阱密度和载流子迁移率之间的定量关系 .
Based on the trapped charge-limited current conduction theory, a numerical model of a double-layer organic electroluminescent device is proposed. The device with the structure of “HTL / EML / cathode” The current density and the quantum efficiency in the organic layer depend on the trap energy, trap density and carrier mobility of the organic layer.It is found that for the given trap energy, trap density and carrier mobility of HTL and EML, There is an optimal thickness ratio between HTL and EML at which the current density and quantum efficiency of the device are maximized.The current density and quantum efficiency of the device can be increased by as much as the thickness of the organic layer Two orders of magnitude.In addition, the quantitative relationship between the optimum thickness ratio and the trapped trapped energy, total trap density and carrier mobility was also studied.