Issue 36, 2021

The solution-processed fabrication of perovskite light-emitting diodes for low-cost and commercial applications

Abstract

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.

Graphical abstract: The solution-processed fabrication of perovskite light-emitting diodes for low-cost and commercial applications

Article information

Article type
Perspective
Submitted
20 jul 2021
Accepted
16 ago 2021
First published
19 ago 2021

J. Mater. Chem. C, 2021,9, 12037-12045

The solution-processed fabrication of perovskite light-emitting diodes for low-cost and commercial applications

J. Zhang, B. Wei, L. Wang and X. Yang, J. Mater. Chem. C, 2021, 9, 12037 DOI: 10.1039/D1TC03385A

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