Flexible perovskite light-emitting diodes: Progress, challenges and perspective

Metal halide perovskites with excellent optoelectronic properties and good ductile properties have emerged as promising materials suitable for flexible optoelectronics that can be integrated into portable and wearable display devices, showing great potential for the next generation displays and lighting. Currently, encouraging progress has been witnessed in the field of flexible perovskite light-emitting diodes (PeLEDs), with maximal external quantum efficiencies (EQEs) of over 28%. Herein, we summarize the major breakthroughs in recent years, with the aim of providing a comprehensive review and facilitating the further development of flexible PeLEDs. In addition, the main challenges that hinder the performance and commercialization of flexible PeLED devices are discussed. Finally, a brief perspective and conclusion toward the future opportunities and applications of flexible PeLEDs are provided.