Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , Suzhou 215123, China.
ACS Appl Mater Interfaces. 2017 Jan 25;9(3):2767-2775. doi: 10.1021/acsami.6b14778. Epub 2017 Jan 11.
Inverted organic light-emitting diode (OLED) has attracted extensive attention due to the demand in active-matrix OLED display panels as its geometry enables the direct connection with n-channel transistor backplane on the substrate. One key challenge of high-performance inverted OLED is an efficient electron-injection layer with superior electrical and optical properties to match the indium tin oxide cathode on substrate. We here propose a synergistic electron-injection architecture using surface modification of ZnO layer to simultaneously promote electron injection into organic emitter and enhance out-coupling of waveguided light. An efficient inverted white OLED is realized by introducing the nanoimprinted aperiodic nanostructure of ZnO for broadband and angle-independent light out-coupling and inserting an n-type doped interlayer for energy level tuning and injection barrier lowering. As a result, the optimized inverted white OLEDs have an external quantum efficiency of 42.4% and a power efficiency of 85.4 lm W, which are accompanied by the superiority of angular color stability over the visible wavelength range. Our results may inspire a promising approach to fabricate high-efficiency inverted OLEDs for large-scale display panels.
倒置有机发光二极管（OLED）由于在有源矩阵 OLED 显示面板中的需求而受到广泛关注，因为其几何形状允许与衬底上的 n 沟道晶体管背板直接连接。高性能倒置 OLED 的一个关键挑战是具有优异的电和光性能的高效电子注入层，以与衬底上的氧化铟锡阴极相匹配。我们在这里提出了一种协同电子注入架构，使用 ZnO 层的表面修饰来同时促进有机发射器中的电子注入并增强波导光的出射。通过引入用于宽带和角度无关光出射的纳米压印非周期性纳米结构的 ZnO 和用于能级调谐和注入势垒降低的 n 型掺杂中间层，实现了高效的倒置白色 OLED。结果，优化的倒置白色 OLED 的外量子效率为 42.4%，功率效率为 85.4 lm W，同时在可见波长范围内具有角度颜色稳定性的优势。我们的结果可能会激发一种制造用于大规模显示面板的高效倒置 OLED 的有前途的方法。
