Understanding and Control of Metal-Organic Contacts and Transport in Organic Devices

如果发光二极管（led）等有机器件要在显示工程中发挥其潜力，了解其电流-电压（I-V）特性是很重要的。需要改进接触和散装运输。以可控方式修改触点的灵活性对于将新型聚合物透明电极或稳定的高功功能金属纳入有机器件将是重要的。在有机器件中，特别是在发光二极管技术中，最关键的问题是与电荷注入和输运物理有关。稳定性被认为是设备工作寿命的主要限制。各种各样的器件应用依赖于对有机发光二极管的I-V特性的深刻理解，而增加的理解可能会指导材料的系统操作。电流-电压特性将在限制排放和限制空间电荷注入两种情况下进行测量。在高场状态下，将测量电致发光、光致发光、拉曼和电流-电压特性。对发射受限触点的I-V特性进行理论研究。研究了无序电子聚合物中极化子的高场稳定性和迁移率的场依赖性。该项目可能与发展偶极间层有关，以降低有机器件的工作电压，并允许稳定的金属用作触点。

An understanding of current-voltage (I-V) characteristics of organic devices such as light-emitting diodes (LEDs) is important if these devices are to attain their potential for display engineering. Improvements in contacts and bulk transport are required. The flexibility to modify contacts in a controlled fashion will be important for incorporating new polymeric transparent electrodes or stable high work function metals into organic devices. The most critical remaining problems in organic devices, and particularly in light-emitting diode technology, are related to charge injection and transport physics. Stability is thought to be the primary limitation in device operating lifetime. The variety of device applications rely on a deep understanding of I-V characteristics of organic light-emitting diodes, and increased understanding may guide the systematic manipulation of materials. Current-voltage characteristics will be measured in both emission-limited and space charge limited injection regimes. In the high field regime electroluminescence, photoluminescence, Raman and current-voltage characteristics will be measured. A theoretical study of I-V characteristics of emission limited contacts will be carried out. The high-field stability of polarons and the field dependence of mobility in disordered electronic polymers will be investigated. This project may be relevant to the development of dipolar interlayers to reduce operating voltages of organic devices and permit stable metals to be used as contacts.