【作者】 杨特宁；

【导师】 郭亨群；

【作者基本信息】 华侨大学 ， 物理电子学， 2002， 硕士

【摘要】 有机／聚合物电致发光是一种新兴平板显示技术。有机发光显示器在显示面积大小、对比度、色彩逼真度、响应时间、视角和亮度等方面，有着其它显示技术无法比拟的优势，有望在不远的将来取代液晶(LCD)显示。如何进一步提高有机发光二极管(OLED)的发光效率、提高发光亮度、延长器件寿命、降低工作电压还处于不断研究中。要达到这些目标，除了材料外，器件的结构设计也是至关重要的。本文利用互掺过渡层结构，对通常采用的界面结构进行改进，以期获得更好的器件性能。本文共分五章： 第一章：详细叙述了有机／聚合物电致发光器件的研究进展，分析了其作为平板显示的优缺点，介绍了OLED结构、发光原理和提高其效率的途径等。 第二章：讨论了LiF作为电子注入层，CuPc作为空穴注入层对器件性能的影响。 第三章：研究了短距离内浓度渐变互掺、较长距离的均匀比例互掺以及通过掺杂荧光染料进行互掺的三种互掺过渡层结构对器件性能的影响。 第四章：介绍了未来的各种平板显示技术，指出OLED的光辉未来。 第五章：结论总结。 我们在研究互掺过渡层之前，研究了功能层对器件影响。LiF作为电子注入层，能够明显提高器件的发光效率，降低器件的工作电压；CuPc作为空穴注入层能够使器件稳定性提高，但也导致了亮度和效率的下降。在对互掺过渡层的研究中发现，OLED中有机层间的界面对器件的性能有很大的影响。我们在器件中引入了互掺过渡层结构，发现不管在电子传输层和空穴传输层之间，还是在空穴传输层和空穴注入层之间采用这样的掺杂结构，都能够有效减少有机层间的界面缺陷态，明显提高了器件的亮度，降低了器件的工作电压。我们还发现，在互掺过渡层中再掺入荧光染料，能够显著提高器件的效率，并且观察到了双区域发射现象。本论文支持了靠人为消除有机层间界面，使载流子在有机层内更加顺畅流动来提高器件性能的观点。本文的最后，阐述了OLED是目前各种显示技术中，将来最有望代替LCD显示的显示技术，有着光辉的未来。更多还原

【Abstract】 Organic/polymeric electroluminescence is a newly-emerging display technique. From the aspects of display area, contrast color fidelity, response time, visual angle and brightness, the organic electroluminesent display device has the advantages over other display techniques. It is expected to replace liquid crystal display in the future. How to further improve the luminous efficiency, brightness, life length and operating voltage of organic light-emitting diodes (OLEDs) is still in research. To achieve these goals, we should pay attention to the significance of the design of the device structure as well as materials. In this paper, we introduce a mutually doped transitional layer to modify the interface structure used commonly, expecting to increase the performance of OLED. This paper has five chapters:The first chapter: describing the evolution of the Organic/polymeric electroluminescent device, analyzing its advantages and disadvantages when acting as flat display, introducing the OLED structure, luminous mechanics and the methods of increasing the luminous efficiency, etc.The second chapter: discussing the effects on the performance of OLED if the LiF acts as an electron inject layer and/or CuPc acts as a hole inject layer.The third chapter: studying three mutually doped transitional layer structures’ effects on the performance of OLED. The three structures are the thin mutually doped transitional layer with concentration gradually changing structure, the thicker transitional layer with uniform concentration structure and the transitional layer doped with fluorescent dye structure.The fourth chapter: introducing the display techniques in the future and pointing out that the OLED has a brilliant prospect.The fifth chapter: summing up the conclusions of this paper.The influence of functional layer upon the performance of the OLED is studied ahead the mutually doped transitional layer. LiF acting as the electron inject layer can increase the luminous efficiency and decrease the operating voltage; CuPc acting as the hole inject layer can improve the device’s stability, but at the same time, it will cause the reduction of brightness and efficiency. In the study of the mutually dopedtransitional structure, we discover that the interfaces of organic have great effects on the device’s performance. When a mutually doped transitional layer is introduced, no matter it is added to the interspace of electron transport layer and hole transport layer or to the interspace of the hole transport layer and hole inject layer, it can reduce the defects of the interface and result in the increase of brightness and the decrease of the operating voltage obviously. We also discover that luminous efficiency is increased markedly and two zones emission phenomenon appears if a fluorescent dye is added to the transitional layer between the ETL and HTL. This paper supports the standpoint that the interfaces of organic layers should be removed to make charge carriers move smoothly in order to improve the performance of OLED. At the end of the paper, other new present display techniques are compared with OLED, pointing out that the OLED is the most promising display technique to replace liquid crystal display in the future and has a brilliant future.更多还原