Potential and perspectives of halide perovskites in light emitting devices

Abstract

Light emitting diodes (LEDs) have become part of numerous electrical and electronic systems such as lighting, displays, status indicator lamps and wearable electronics. Owing to their excellent optoelectronic properties and deposition via simple solution process, metal halide perovskites possess unique potential for developing halide perovskite-based LEDs (PeLEDs) with superior photoluminescence efficiencies leading to external quantum efficiencies beyond 20% for PeLEDS. However, the limited durability, high operative voltages, and challenges of scale-up are persisting barriers in achieving required technology readiness levels. To build up the existing knowledge and raise the device performance this review provides a state-of-the-art study on the properties, film and device fabrication, efficiency, and stability of PeLEDs. In terms of commercialization, PeLEDs need to overcome materials and device challenges including stability, ion migration, phase segregation, and joule heating, which are discussed in this review. We hope, discussions about the strategies to overcome the stability issues and enhancement the materials intrinsic properties towards development more stable and efficient optoelectronic devices can pave the way for scalability and cost-effective production of PeLEDs. Graphical Abstract

Lead-free Perovskite with Distorted [InX6]3– Octahedron Induced by Organic Cation and Enhanced PLQY by Sb Doping

“…To address the growing energy shortage and pollution concerns, it is important to find efficient and eco-friendly luminescent materials. White light-emitting diodes (wLEDs) have emerged as a viable alternative to traditional incandescent and xenon lamps due to their high energy efficiency and stability, making them a popular choice for lighting and color-rendering applications. − In recent years, metal halide perovskites have emerged as a class of material with low-temperature solution processing, tunable band structure, and efficient photoluminescence, which offer an intriguing potential application for low-cost LEDs. − Lead halide perovskite, represented by CsPbX 3 (X = Cl, Br, I), can be used as an excellent solid-state luminescent material because of its high absorption coefficient, high carrier mobility and adjustable band gap, wide band luminescence, and high photoluminescence quantum yield (PLQYs). − …”

Organic cations in halide perovskite solid solutions: exploring beyond size effects

“…1 This class of materials has recognized diverse optoelectronic applications owing to their chemical, structural, synthetic, and property vastness. [2][3][4][5][6][7][8][9][10] With intense initial progress and current establishment of the fundamentals of these materials, with high efficiencies being obtained in perovskite devices, as in solar cells, 11 these materials can be close to the commercial outbreak as their main bottleneck, i.e., their instability issues, keeps getting better addressed. [12][13][14][15][16][17] In this scenario of technological maturity, a great part of the scientific challenges ahead lies in consolidating the understanding of the principles behind empirical knowledge about these materials.…”