Unlocking the Potential of Blue Perovskite Light‐Emitting Diodes for Active‐Matrix Displays

Liu, Baiquan; Lu, Guanhua; Wu, Runfeng; Hu, Sujuan; Zhang, Lingjiao; Guo, Min; Yuan, Zhangyu; Xue, Qifan; Xiao, Peng; Luo, Dongxiang; Zhang, Yiping; Huang, Fei; Liu, Chuan

doi:10.1002/adom.202202894

Cited by 9 publications

(1 citation statement)

References 65 publications

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“…In layered perovskites, this reproducibility problem arises from the fact that the n phases have minimal differences in their formation energies [25], resulting in large variations in the phase composition even when a slight change in perovskite thin-film growth conditions occurs [26,27]. Many examples of significant deviations in performance can indeed be observed in the literature, including in the case of quite efficient systems, independently of their emission wavelength [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Improving Device-to-Device Reproducibility of Light-Emitting Diodes Based on Layered Halide Perovskites

Do,

Antony,

Ratier

et al. 2024

Electronics

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Layered halide perovskites have emerged as a promising contender in solid-state lighting; however, the fabrication of perovskite light-emitting devices in laboratories usually experiences low device-to-device reproducibility since perovskite crystallization is highly sensitive to ambient conditions. Although device processing inside gloveboxes is primarily used to reduce the influence of oxygen and moisture, several extraneous variables, including thermal fluctuations in the inert atmosphere or contaminations from residual solvents, can destabilize the crystallization process and alter the properties of the emissive layers. Here, we examine typical experimental configurations used in research laboratories to deposit layered perovskite films in inert atmospheres and discuss their crucial influences on the formation of polycrystalline thin films. Our results demonstrate that fluctuations in the glovebox properties (concentrations of residual O2 and H2O or solvent traces), even in very short timescales, can negatively impact the consistency of the perovskite film formation, while thermal variation plays a relatively minor role in this phenomenon. Furthermore, the careful storage of chemical species inside the workstation is critical for reproducing high-quality perovskite layers. Consequently, when applying our most controlled environment for perovskite deposition, the photoluminescence lifetime of perovskite thin films shows a standard deviation of only 3%, whereas the reference set-up yields a 15% standard deviation. Regarding complete perovskite light-emitting diodes, the uncertainties in statistical luminance and EQE data are significantly reduced from 230% and 140% to 38% and 42%, respectively.

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Section: Introductionmentioning

confidence: 99%

Improving Device-to-Device Reproducibility of Light-Emitting Diodes Based on Layered Halide Perovskites

Do,

Antony,

Ratier

et al. 2024

Electronics

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Flexible Perovskite Light‐Emitting Diodes: Characteristics and Performance

Liu,

Mukhin,

Islamova

et al. 2023

Adv Funct Materials

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Future displays need to be stretchable, bendable, and wearable to match consumers’ needs for convenience, portable equipment, and real‐time information display. The development of flexible light source components, like flexible light‐emitting diodes (LEDs), is urgently required to fulfill these needs. Metal halide perovskites, known for their excellent optoelectronic properties and ductility, are considered the most promising light‐emitting materials for high‐definition displays, and their outstanding advantage is that the metal halide perovskites would be achieved by solution process under low temperature (<150 °C), which is especially good for the flexible organic substrates to maintain high conductivity during fabrication of flexible LEDs. In recent years, flexible perovskite LEDs have made significant progress, but still face a great deal of difficulties, obstacles, and great challenges. Herein, the mechanical properties of perovskite materials are examined and the failures for perovskite‐based flexible optoelectronic devices under strain are discussed. The authors then focus on optimizing each functional layer and the recent advancement in flexible perovskite LEDs is summarized. Finally, a brief outlook on the challenges faced by flexible perovskite LEDs and their possible future development is provided.

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Manipulating Electron‐Phonon Coupling for Efficient Tin Halide Perovskite Blue LEDs

Han,

Guo,

Liu

et al. 2024

Advanced Materials

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Low‐dimensional perovskites have opened up a new frontier in light‐emitting diodes (LED) due to their excellent properties. However, concerns regarding the potential toxicity of Pb limited their commercial development. Sn‐based perovskites are regarded as a promising candidate to replace Pb‐based counterparts, while they generally exhibit strong electron–phonon coupling and consequently blue emission quenching at room temperature (RT), thus the Sn‐based perovskite blue LED devices have not yet been reported. Herein, the luminescence properties are regulated by assembling a rigid organic skeleton within perovskite structure, and the protonated 4‐bromobenzylamine (BrPMA+ = C7H9BrN+) is employed as A site cation to synthesize a 100‐oriented 2D perovskite (BrPMA)2SnBr4, which exhibits a strong lattice rigidity via strong intermolecular interaction and consequently weak electron–phonon coupling, achieving the excellent blue PL emission at RT. The high quality (BrPMA)2SnBr4 perovskite thin films are obtained by further inhibiting oxidation and promoting crystallization. Finally, the Sn‐based perovskite blue emission LED is successfully fabricated for the first time at 467 nm with a champion EQE of 1.3% and a maximum brightness of 800 cd m−2. This work gives insights into the luminescence mechanism of Sn‐based perovskites and provides a new theoretical basis for the development of lead‐free blue LEDs.

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Unlocking the Potential of Blue Perovskite Light‐Emitting Diodes for Active‐Matrix Displays

Cited by 9 publications

References 65 publications

Improving Device-to-Device Reproducibility of Light-Emitting Diodes Based on Layered Halide Perovskites

Improving Device-to-Device Reproducibility of Light-Emitting Diodes Based on Layered Halide Perovskites

Flexible Perovskite Light‐Emitting Diodes: Characteristics and Performance

Manipulating Electron‐Phonon Coupling for Efficient Tin Halide Perovskite Blue LEDs

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