Red Perovskite Light‐Emitting Diodes: Recent Advances and Perspectives

Abstract

Metal halide perovskite (MHP) materials have shown great advantages for the next-generation optoelectronic devices, especially for light-emitting diodes (LEDs), on account of their outstanding photoelectric properties and facile solution processability. However, the performances of red perovskite LEDs (PeLEDs) are not ready for commercialization, presumably due to the instability both of the emission spectra and operation conditions, and the toxicity of lead ions. In this review, the structures, physical properties, and preparation approaches of red emissive perovskite materials are first introduced, including 3D bulk perovskites, 2D and quasi-2D perovskites, and colloidal perovskite nanocrystals (NCs). In addition, several strategies that contribute to the recent development and achievement of red PeLEDs are summarized in detail, mainly involving component engineering, dimension, and phase distribution modulation, ligand engineering, additive engineering, interfacial engineering, and strategies for the light out-coupling device structure. Moreover, the challenges and corresponding solutions are discussed from three aspects of spectral stability, operational stability, and lead-free red PeLEDs. Finally, the conclusion and outlook on the promising future of the red PeLEDs are raised.

In Situ Halide Insertion for Efficient and Stable Pure‐Red Perovskite Light‐Emitting Diodes

“…To achieve the desirable pure-red perovskite emitters, substantial progress has been made in the modulation of the perovskite composition and dimensionality. [15,16] In the aspect of perovskite composition, the strategy of mixed-halide perovskites (e.g., CsPbBr x I 3-x , FAPbBr x I 3-x , 0 < x < 3, FA: formamidinium) were widely adopted to obtain the desired emission colors. The emission wavelengths of mixed bromide-iodine perovskite can be facilely tuned to achieve purered emission by optimizing the bromide/iodine ratio.…”

Ag Nanoparticles Optimized the Optical Properties and Stability of CsPbBrI2 Glass for High Quality Backlight Display

“…As the display industry continues to evolve, the market puts forward higher requirements on the performance of display devices. − All inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystal (NC) materials exhibit distinguished optical properties, including high carrier mobility, size-tunable emission, narrow full width at half-maximum (fwhm), − and high photoluminescence quantum yield (PLQY). , Over the past few years, they have been consistently identified as emerging frontiers, particularly in the area of backlight display applications, − generating significant interest among researchers. However, the instability of perovskite quantum dots (QDs), particularly their sensitivity to environmental conditions such as water, heat, light, and oxygen, significantly hinders their potential applications. − To keep pace with industrial development, it is imperative to optimize the performance and stability of perovskite QDs.…”

“…As the display industry continues to evolve, the market puts forward higher requirements on the performance of display devices. 1−3 All inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystal (NC) materials exhibit distinguished optical properties, including high carrier mobility, 4 size-tunable emission, 5 narrow full width at half-maximum (fwhm), 6−8 and high photoluminescence quantum yield (PLQY). 9,10 Over the past few years, they have been consistently identified as emerging frontiers, particularly in the area of backlight display applications, 11−14 generating significant interest among researchers.…”

High-Performance Pure Red Quasi-Two-Dimensional Perovskite Light-Emitting Diodes with Bifunctional Potassium Trifluoroacetate Additive

“…Perovskite light-emitting diodes (PeLEDs) are regarded as promising candidates for next-generation high-color-purity displays and lighting applications, due to their facile solution processability and excellent optoelectronic properties, such as narrow band emission, widely tunable bandgap, and high photoluminescence quantum yields (PLQYs). , To achieve the application of PeLEDs in high-color-purity displays, as for red emission, the Commission Internationale de l’éclairage (CIE) coordinates should satisfy the International Telecommunication Union Recommendation BT.2020 (Rec.2020) of (0.708,0.292). − PeLEDs with an electroluminescence (EL) emission peak in the range of 620–650 nm meet the Rec.2020 standard and so are referred to as pure red PeLEDs. − …”