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Zhang, Dongdong; Huang, Tianyu; Duan, Lian
Advanced materials (Weinheim), 04/2020, Volume: 32, Issue: 15Journal Article
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. The progress of self‐emissive techniques for flexible displays is reviewed, beginning with emitting active materials and device fabrication technologies, followed by flexible substrates, transparent electrodes, and encapsulation, and then the rapid development of the performance of devices.
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