Man Jia-Xiu, He Shou-Jie, Shi Chang-Sheng, Yang Han-Nan, Wang Deng-Ke, Lu Zheng-Hong
Opt Lett. 2020 Jul 1;45(13):3561-3564. doi: 10.1364/OL.388303.
Connecting electrodes play a crucial role to assist charge injection into the adjacent electroluminescent units in tandem organic light-emitting diodes (OLEDs). In this study, we demonstrate that Mg:Ag alloy is an effective connecting electrode for bottom- and top-emitting tandem OLEDs. Optical cavity design and simulation are also conducted to predict the luminance of tandem OLEDs. It is found that the theoretical luminance of tandem OLEDs is close to but not higher than twofold enhancement over the luminance of a single OLED optimized to the first resonance mode, which is theoretically higher than high-order resonance modes. It is also found that the optical properties of Mg:Ag connecting electrodes, while having relatively small influence on weak microcavity bottom-emitting tandem OLEDs, have large influence on strong microcavity top-emitting tandem OLEDs.
连接电极在串联有机发光二极管（OLED）中辅助电荷注入相邻的电致发光单元方面起着至关重要的作用。在本研究中，我们证明Mg:Ag合金是底部发射和顶部发射串联OLED的有效连接电极。还进行了光学腔设计和模拟以预测串联OLED的亮度。结果发现，串联OLED的理论亮度接近但不高于优化至第一共振模式的单个OLED亮度的两倍增强，理论上高于高阶共振模式。还发现，Mg:Ag连接电极的光学性质，虽然对弱微腔底部发射串联OLED影响相对较小，但对强微腔顶部发射串联OLED影响较大。
