了解叠层有机电致发光器件(简称叠层OLEDs)的工作机理是制备高性能叠层OLEDs的基础，在叠层OLEDs中，器件内载流子浓度、电场强度、电势、激子浓度的分布特征，发光单元的电流平衡因子及器件的出光特性是叠层OLEDs工作机理的重要表现形式。本项目以基于有机异质结为连接层的叠层OLEDs为研究对象，拟数值研究其电学和光学性能。首先，建立准确的叠层OLEDs的电学模型，通过数值求解，研究器件中载流子浓度、电场强度、电势、激子的分布特征以及各个发光单元的电流平衡因子；其次，建立叠层OLEDS的光学模型，研究功能层厚度对器件出光特性和发光光谱的影响；最后，研制一套叠层OLEDs光电性能模型软件，为深入了解叠层OLEDs的工作机理、制备高性能的叠层OLEDs提供一个可靠的分析工具。

The further understanding of the work mechanism of tandem OLEDs is the basis of fabrication of high performance tandem OLEDs. For tandem OLEDs, the distribution characteristics of carrier concentration, electric field intensity, potential and excition concentration in device，the current balance factor of each light units，and the light output perfanmence are the significant embodiment of manifestation of work mechanism. The project investigates on the electrical and optical performance of organic heterojunction-based tandem OLEDs by numerical study method. Firstly, it builds an electrical model for tandem OLEDs in order to research the distribution characteristics of carrier concentration, electric field intensity, potential and excition concentration in device. Secondly, it builds an optical model of tandem OLEDs for studying the influence of the functional layer thickness on the light output property and light emitting spectrum of tandem OLEDs. Finally, it edits a set of software to caculate the electrical and optical performance of tandem OLEDs, providing a reliable analysis tool to research and design the tandem OLEDs.