Toward Stable and Efficient Perovskite Light‐Emitting Diodes. (11th November 2021)

• Record Type: Journal Article
• Authors: Yang, Dexin; Zhao, Baodan; Yang, Tao; Lai, Runchen; Lan, Dongchen; Friend, Richard H.; Di, Dawei
• Is Part Of: Advanced functional materials. Volume 32:Number 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-11
• Subjects: perovskite light‐emitting diodes -- metal halide perovskites -- optoelectronic devices -- stability -- efficiency; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202109495
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Metal halide perovskites (MHPs) are a promising class of materials for next‐generation display and lighting applications. Since the first demonstration of bright electroluminescence (EL) from perovskite light‐emitting diodes (PeLEDs) in 2014, the EQEs of these devices increased from below 1% to more than 20% in merely four years. Despite the meteoritic rise of device efficiencies that placed the new LED technology in the spotlight, many scientific and technical challenges remain, preventing PeLEDs from advancing further into practical applications. The success of inorganic III‐V LEDs, or commercial LED technologies in general, lies in the ability to demonstrate the reliable generation of blue EL. For PeLEDs, high operational stability and efficient blue EL remain to be some of the most pressing goals. To accelerate further developments in these areas, the recent progress in the research of PeLEDs is reviewed. The authors attempt to establish preliminary connections between the degradation mechanisms and the strategies for improvements, exemplified by a selection of recent representative works in the field. Lessons learned from organic LEDs and perovskite solar cells point toward some of the most important directions. This progress report serves as a catalyst for further interdisciplinary research involving materials scientists, chemists, and physicists working together to realize operationally stable PeLEDs. Abstract : Perovskite LEDs show great promise for next‐generation display and lighting applications. However, many scientific and technical challenges remain, preventing perovskite LEDs from advancing further into practical applications. This review attempts to outline key mechanisms affecting device efficiency and operational stability as well as the strategies for improvements, exemplified by a selection of recent representative works in the field.