Long lifetime and high efficiency are strongly desired for electronic devices. Encapsulation is especially required for organic light-emitting diodes (OLEDs) because they are extremely sensitive to the ambient moisture and oxygen. However, few studies had investigated their individual effects. We found in this study that even with a trace amount, oxygen showed drastically marked effects on both the short- and long-term properties of OLEDs, either typical or tandem. It is unprecedented to see that moisture did not compromise the device performance at least within the 20 ppm level. In contrary, the moisture helped alleviate the attack of oxygen via reducing its kinetic energy and collision probability striking on the aluminum surface. The findings suggest a more stringent oxygen control in fabrication and encapsulation to achieve an upmost device performance.

电子设备强烈需要长寿命和高效率。有机发光二极管 (OLED) 尤其需要封装，因为它们对环境中的水分和氧气极为敏感。然而，很少有研究调查了它们的个体影响。我们在这项研究中发现，即使是微量，氧气对 OLED 的短期和长期特性（无论是典型的还是串联的）都显示出显着的影响。湿气至少在 20 ppm 水平内不会影响设备性能，这是前所未有的。相反，水分通过降低其撞击铝表面的动能和碰撞概率来帮助减轻氧气的侵蚀。