The solution-processed fabrication of perovskite light-emitting diodes for low-cost and commercial applications,Journal of Materials Chemistry C

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The solution-processed fabrication of perovskite light-emitting diodes for low-cost and commercial applications
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-08-19 , DOI: 10.1039/d1tc03385a
Jianfeng Zhang ₁ , Bin Wei ₁ , Lin Wang ₁ , Xuyong Yang ₁

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Metal halide perovskite light-emitting diodes (PeLEDs) have emerged as some of the most promising candidates for next-generation high-resolution displays due to their wide color gamut, high color purity, and low-cost solution processability. After just a few years of research, the external quantum efficiencies (EQEs) have exceeded 20% for PeLEDs based on the vacuum evaporation of charge transport layers (CTLs) upon perovskite layers. The use of all-solution-processed deposition to produce PeLEDs could further simplify fabrication procedures, lower processing costs, and enhancing compatibility with flexible substrates. However, the EQEs do not exceed 7% for these PeLEDs because perovskites are sensitive to many solvents due to their ionic nature. Moreover, colloidal perovskite quantum dots (PeQDs) easily dissolve in polar and non-polar solvents because of their surface organic ligands. In this perspective, we first briefly introduce the crystal structures and intrinsic instability of metal halide perovskites making them unsuitable for solution-processed deposition, and then summarize recent advances relating to all-solution-processed PeLEDs. Finally, the challenges and outlooks for the future development of all-solution-processed PeLEDs are discussed.

中文翻译：

用于低成本和商业应用的钙钛矿发光二极管的溶液加工制造

金属卤化物钙钛矿发光二极管 (PeLED) 因其宽色域、高色纯度和低成本溶液加工性而成为下一代高分辨率显示器的最有希望的候选者之一。经过短短几年的研究，基于钙钛矿层上电荷传输层 (CTL) 的真空蒸发，PeLED 的外部量子效率 (EQE) 已超过 20%。使用全溶液处理沉积来生产 PeLED 可以进一步简化制造程序，降低加工成本，并增强与柔性基板的兼容性。然而，这些 PeLED 的 EQE 不超过 7%，因为钙钛矿由于其离子性质而对许多溶剂敏感。而且，胶体钙钛矿量子点 (PeQDs) 由于其表面有机配体而容易溶解在极性和非极性溶剂中。从这个角度来看，我们首先简要介绍了金属卤化物钙钛矿的晶体结构和内在不稳定性，使其不适合溶液处理沉积，然后总结与全溶液处理 PeLED 相关的最新进展。最后，讨论了全溶液处理的 PeLED 未来发展的挑战和展望。

更新日期：2021-09-14

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