Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
Department of Physics, The University of Texas at Dallas , 800 West Campbell Road, PHY 36, Richardson, Texas 75080-3021, United States.
ACS Appl Mater Interfaces. 2016 Apr 13;8(14):8888-92. doi: 10.1021/acsami.6b01816. Epub 2016 Apr 1.
Light-emitting electrochemical cells (LEECs) offer the potential for high efficiency operation from an inexpensive device. However, long turn-on times and low luminance under steady-state operation are longstanding LEEC issues. Here, we present a single-layer LEEC with a custom-designed iridium(III) complex and a lithium salt additive for enhanced device performance. These devices display reduced response times, modest lifetimes, and peak luminances as high as 5500 cd/m(2), 80% higher than a comparable device from an unoptimized complex and 50% higher than the salt-free device. Improved device efficiency suggests that salt addition balances space charge effects at the interfaces. Extrapolation suggests favorable half-lives of 120 ± 10 h at 1000 cd/m(2) and 3800 ± 400 h at 100 cd/m(2). Overall, complex design and device engineering produce competitive LEECs from simple, single-layer architectures.
发光电化学电池 (LEEC) 为从廉价设备中获得高效率操作提供了潜力。然而，长开启时间和稳定状态下的低亮度仍然是 LEEC 的长期问题。在这里，我们提出了一种具有定制设计的铱(III)配合物和锂盐添加剂的单层 LEEC，以提高器件性能。这些器件显示出较短的响应时间、适度的寿命和高达 5500 cd/m(2)的峰值亮度，比未优化配合物的可比器件高 80%，比无盐器件高 50%。改进的器件效率表明盐的添加可以平衡界面处的空间电荷效应。推断表明，在 1000 cd/m(2)时半衰期为 120 ± 10 h，在 100 cd/m(2)时半衰期为 3800 ± 400 h。总的来说，通过简单的单层结构设计和器件工程，可以制造出具有竞争力的 LEEC。
