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

了解发光二极管(LED)等有机器件的电流-电压(I-V)特性对于实现这些器件在显示工程中的潜力是非常重要的。需要改进接触和散装运输。对于将新的聚合物透明电极或稳定的高功函数金属结合到有机器件中，以受控方式修改触点的灵活性将是重要的。有机器件中最关键的遗留问题，特别是发光二极管技术，与电荷注入和传输物理有关。稳定性被认为是器件工作寿命的主要限制因素。器件应用的多样性依赖于对有机发光二极管的I-V特性的深入了解，而了解的增加可能会指导对材料的系统操作。电流-电压特性将在发射受限和空间电荷受限注入两种情况下进行测量。在高场区，将测量电致发光、光致发光、拉曼光谱和电流-电压特性。对发射限流触头的I-V特性进行了理论研究。我们将研究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。该项目可能与偶极中间层的开发有关，以降低有机器件的工作电压并允许将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.