Solution processing manufacturing is the key method to reduce the OLED device production cost. Furthermore, digital printing techniques such as inkjet printing provide the advantages of mask-free patterning, non-contact manufacturing and direct chip-integration. However, a complex layer structure consisting of ultrathin layers is typically required to obtain high device performance, which is difficult for inkjet printing manufacturing due to interlayer mixing, limited layer uniformity, and limited material availability. In this contribution, we introduce an ITO-free, inkjet-printed transparent OLED with a simple 4-layer structure via an inkjet-printable Al:ZnO:PEI interlayer. This is the first ITO-free, vacuum-free, fully solution-processed transparent OLED using the inkjet printing technique as the exclusive technique for electrode deposition and patterning. High emission brightnesses of 50 000 cd m⁻² and 16 000 cd m⁻² were achieved in a voltage-pulsed driving mode on ITO and silver nanowire embedded PEDOT:PSS bottom electrodes, respectively. In order to use the OLEDs for on-chip fluorescence sensing applications, the operational lifetime was also tested under a high emission brightness of ∼10 000 cd m⁻². LT85 was achieved after 3000 pulses.

中文翻译：

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不含ITO的喷墨印刷透明有机发光二极管，带有单个喷墨印刷的Al：ZnO：PEI中间层，用于传感应用

溶液加工制造是降低OLED装置生产成本的关键方法。此外，诸如喷墨印刷的数字印刷技术提供了无掩模图案化，非接触式制造和直接芯片集成的优点。然而，通常需要由超薄层组成的复杂层结构来获得高装置性能，由于层间混合，有限的层均匀性和有限的材料可用性，这对于喷墨印刷制造而言是困难的。在此贡献中，我们通过以下步骤介绍了具有简单4层结构的无ITO喷墨印刷透明OLED 。可喷墨印刷的Al：ZnO：PEI中间层。这是第一款使用喷墨印刷技术作为电极沉积和图案形成的专有技术的无ITO，无真空，经过完全溶液处理的透明OLED。在电压脉冲驱动模式下，分别在ITO和嵌入银纳米线的PEDOT：PSS底部电极上实现了500000 cd m ^-2和16000 cd m ^-2的高发射亮度。为了将OLED用于片上荧光传感应用，还对约10000 cd m ^-2的高发射亮度下的使用寿命进行了测试。LT85是在3000个脉冲后获得的。