Zhang Dongdong, Huang Tianyu, Duan Lian
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, P. R. China.
Adv Mater. 2020 Apr;32(15):e1902391. doi: 10.1002/adma.201902391. Epub 2019 Oct 9.
Featuring a combination of ultrathin and lightweight properties, excellent mechanical flexibility, low power-consumption, and widely tunable saturated emission, flexible displays have opened up a new possibility for optoelectronics. The demands for flexible displays are growing on a continual basis due not only to their successful commercialization but, more importantly, their endless possibilities for wearable integrated systems. Up to now, self-emissive technologies for displays, flexible active-matrix organic light-emitting diodes (flex-AMOLED), flexible quantum dot light-emitting diodes (flex-QLEDs), and flexible perovskite light-emitting diodes (flex-PeLEDs) have been widely reported, but despite the significant progress made in these technologies, enormous obstacles and challenges remain for the vision of truly wearable applications, in particular with flex-QLEDs and flex-PeLEDs. Here, a review of the recent progress of all three self-emissive technologies for flexible displays is conducted, including the emissive active materials, device structures and approaches to manufacturing, the flexible substrates, and conductive electrodes, as well as the encapsulation techniques. The fast-paced improvement made to the efficiency of flexible devices in recent years is also summarized. The review concludes by making suggestions on the future development in this area, and is expected to help researchers in gaining a comprehensive understanding about the newly emerging technologies for flexible displays.
柔性显示器具有超薄、轻质、出色的机械柔韧性、低功耗以及广泛可调的饱和发射等特性，为光电子学开辟了新的可能性。对柔性显示器的需求持续增长，这不仅归因于它们的成功商业化，更重要的是它们在可穿戴集成系统方面具有无限潜力。到目前为止，已经广泛报道了用于显示器的自发光技术，如柔性有源矩阵有机发光二极管（flex-AMOLED）、柔性量子点发光二极管（flex-QLED）和柔性钙钛矿发光二极管（flex-PeLED），但尽管这些技术取得了重大进展，但对于真正的可穿戴应用愿景而言，仍然存在巨大障碍和挑战，特别是对于flex-QLED和flex-PeLED。在此，对用于柔性显示器的所有三种自发光技术的最新进展进行综述，包括发光活性材料、器件结构和制造方法、柔性基板、导电电极以及封装技术。还总结了近年来柔性器件效率的快速提升。综述最后对该领域的未来发展提出建议，有望帮助研究人员全面了解新兴的柔性显示器技术。
