基于有机光伏型连接层的叠层有机电致发光器件

项目名称： 基于有机光伏型连接层的叠层有机电致发光器件

项目编号： No.61307029

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 刘慧慧

作者单位： 太原理工大学

项目金额： 28万元

中文摘要： 作为一种能够实现小电流驱动下高亮度发光的有机电致发光器件，叠层器件能够解决高驱动电流带来的诸多负面效应。但是叠层器件同样也面临着一些问题，如连接层电压负载造成的器件功耗增加以及电荷产生效率不足引起的的复合区内电荷不平衡。我们突破当前的设计思路，提出一种基于有机光伏效应的叠层有机电致发光器件设计理念。由于有机电致发光器件结构的特殊性，80%的光辐射会损失掉，因此我们在叠层器件两发光单元之间插入一个基于光伏效应连接层，使其可以吸收部分由器件复合区发出的光子并形成激子，并在外电场的促进下，实现无能量势垒、高效率的电荷产生效果。产生的电荷可以很好的实现其两侧发光单元复合区内的电荷平衡以及高的发光效率，而高效率的发光又为连接层电荷产生提供了光源，因此这是一个良性循环过程。因为整个循环过程都发生在器件内部，利用更多的是80%本该损失掉的光子，因此该光伏型连接层的吸收对器件的效率造成的损失实际很低。

中文关键词： 有机电致发光器件；叠层；光伏型连接层；；

英文摘要： The tandem organic light emitting device (TOLED) can irradiate doubled luminance under the same driving current comparing to conventional devices. So there are no such problems caused by high driving current in TOLEDs. But the introduction of connector between two emissive unites also causes some disadvantages, such as driving high voltage, imbalance charge accumulation in recombination zone, and caused low luminous efficiency. We think outside the box and propose an idea about a new TOLED based on organic photovoltaic-type (OPV) charge generation connector, which can absorbs a portion of photons irradiated from emission zone and form excitons. Such axcitons can disassociate into free charges without any energy barrier and effectively under external electrical field, just like an organic photodetector, which can balance the opposite charges in both recombination zones well, leading to high luminous efficiency and providing enough photons for connector. So such processes are included inside a positive cycle. Normally in OLED only 20% irradiation can be extracted, and remained 80% irradiation is wasted through variety ways. Because the whole positive cycle processes we proposed work inside of the TOLED, the OPV type connector actually utilize the 80% irradiation much more, which should have been wasted, and the ne

英文关键词： organic light emitting devices；tandem；OPV-type CGL；；