本科毕业论文-叠层有机发光器件的性能优化.doc

PAGE 13 叠层有机发光器件的性能优化 Innovative Design and Performance Optimization of Tandem Organic Light-emitting Diodes 摘 要 有机白光发光二极管是实现全色显示的重要原型器件之一,而且作为一种超薄光源还可用作液晶显示的背光源以及一些特殊场合的照明。 本文从发光区域、器件结构、材料选择等方面回顾了有机白光发光研究的一些进展情况，以及对研究现状进行了分析，并做了一些的开拓创新的实验。实验中采用了 MoO3 和 Mg：Bphen 作为叠层有机发光器件的中间连接层，并对其进行了性能优化。在这其中，选择、设计、制备合适的内部连接层是提高叠层器件性能的关键。 本论文主要通过光电子能谱（ XPS 和 UPS ）对叠层有机发光器件的界面电子结构和能级排布进行分析，研究其工作机理，并进一步探讨了各种中间连接层结构和材料对器件性能的影响。具体实验内容如下： 蒸镀单层标准器件,电流效率达到了3 cd/A； 改变器件结构，将单层变为叠层，并且分别使用MoO3，Mg：Bphen和 Mg：Bphen加MoO3作为中间连接层，与单层器件发光单元相比，其亮度与效率均有大幅度提高； 将叠层结构进一步优化，使用叠层加入掺杂结构，使用绿光材料C545T,使得叠层器件的最大电流效率达到了20 cd/A。 通过实验，对前后实验进行对比，从理论分析和实验验证两个角度，都证明了实验结果的正确性和可靠性。 最后，我们还对此次实验进行了一定的推广应用，初步探讨了叠层结构在太阳能电池中作为中间电极的作用。 关键词：半导体技术 叠层有机发光二极管 能级排布 内部连接层 Abstract Organic white light-emitting diode is one of the important prototype devices of full-color display. As a type of super-thin lighting, it can be applied in back-lighting of LCD and various flat-panel displays. This paper presents the progress of organic white light-emitting diodes in terms of light-emitting zone, device structure, and material selection.The favorable intermediate connector is of critical importance for designing high-performance tandem Organic Light-emitting Diodes （ OLEDs ）. In this thesis, the interfacial electronic structures and energy level alignment of Tandem OLED were studied in detail via ultraviolet and X-ray photoemission spectroscopies ( UPS and XPS ), and their working mechanisms for charge carrier generation and injection process were also explored. In addition, the impact of constituent materials and structure on the performance of intermediate connectors were discussed. The details of research work are as following: The single structures; The tandem structures with MoO3-based intermediate connectors.Highly efficient emission was obtained from the tandem device; Device optimization,the maximum luminous efficiency of 20 cd/ A is obtained. Moreover, the function of the interfacial electronic structures