Passivation Layer of Potassium Iodide Yielding High Efficiency and Stable Deep Red Perovskite Light-Emitting Diodes

Chen, Cheng; Xuan, Tongtong; Yang, Yang; Huang, Fan; Zhou, Tianliang; Wang, Le; Xie, Rong‐Jun

doi:10.1021/acsami.2c00621

Cited by 25 publications

(27 citation statements)

References 64 publications

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“…reported Sr 2+ doped CsPbI 3 NCs based red PeLEDs with an EQE of 17% [ 221 ] and further improved the EQE up to 21.8% via KI passivation. [ 222 ]…”

Section: Engineering Peleds Toward High Performancementioning

confidence: 99%

Luminescence and Degeneration Mechanism of Perovskite Light‐Emitting Diodes and Strategies for Improving Device Performance

Qin

et al. 2023

Small Methods

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Perovskite light‐emitting diodes (PeLEDs) can be a promising technology for next‐generation display and lighting applications due to their excellent optoelectronic properties. However, a systematical overview of luminescence and degradation mechanism of perovskite materials and PeLEDs is lacking. Therefore, it is crucial to fully understand these mechanisms and further improve device performances. In this work, the fundamental photophysical processes of perovskite materials, electroluminescence mechanism of PeLEDs including carrier kinetics and efficiency roll‐off as well as device degradation mechanism are discussed in detail. In addition, the strategies to improve device performances are summarized, including optimization of photoluminescence quantum yield, charge injection and recombination, and light outcoupling efficiency. It is hoped that this work can provide guidance for future development of PeLEDs and ultimately realize industrial applications.

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“…reported Sr 2+ doped CsPbI 3 NCs based red PeLEDs with an EQE of 17% [ 221 ] and further improved the EQE up to 21.8% via KI passivation. [ 222 ]…”

Section: Engineering Peleds Toward High Performancementioning

confidence: 99%

Luminescence and Degeneration Mechanism of Perovskite Light‐Emitting Diodes and Strategies for Improving Device Performance

Qin

et al. 2023

Small Methods

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“…Researchers have achieved great success in improving the performance of PeLEDs through material composition engineering, dimensional engineering, and device structure optimization (Figure 4, Table 1, [108,[120][121][122][123][124][125][126][127][128][129][130][131][132][133][134][135][136][137] Table 2, [107,119,11,99, and Table 3 [120,150,35,[161][162][163][164][165][166][167][168][169][170][171][172][173][174][175][176] ), which serve as a fundamental prerequisite for developing flexible PeLEDs. Currently, the EQE of NIR, red, and green PeLEDs exceed 20%, which is close to that of the best quantum dot LEDs and organic LEDs.…”

Section: El Characteristics Of Peledsmentioning

confidence: 99%

Materials, Device Structures, and Applications of Flexible Perovskite Light‐Emitting Diodes

Jang

Kim

et al. 2023

Adv Elect Materials

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The flexible type of displays, which can alter their shape freely (e.g., bendable or foldable displays) according to situational demands, is under an intense spotlight due to applications in human‐friendly mobile electronics. Among various types of light‐emitting diodes (LEDs), meanwhile, perovskite‐based LEDs (PeLEDs) have garnered particular attention in recent years as next‐generation optoelectronic devices due to their exceptional optical characteristics, such as high efficiency (up to theoretical limits), high color purity, wide color gamut over the entire visible range, and ultrathin form factor. By integrating perovskite materials on an ultrathin flexible substrate with a proper encapsulation layer, the flexible PeLEDs, which can conform to various curved surfaces and be stably operated in an ambient condition, have been developed. Here, recent advances of the flexible PeLEDs are reviewed. First, light‐emitting materials and device structures for the PeLEDs are introduced. Then, research progress on the flexible PeLEDs, either with and without the encapsulation layer are summarized. Next, some representative application examples of the flexible PeLEDs are briefly discussed. Finally, this review includes a brief discussion on future prospects.

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“…Chen et al proposed to improve the optical performance of CsPbI 3 :Sr emissive layer (EML) by inserting an additional potassium iodide (KI) passivation layer between the hole transport layer and EML. [ 98 ] The addition of the KI passivation layer can improve the film quality, photoluminescence quantum yield, and thermal stability of the EML. At the same time, the KI layer can also increase the carrier mobility to balance the charge injection in PeLEDs, leading to reduce the Auger recombination and Joule heating.…”

Section: Strategies For Efficient and Stable Red Emission Peledmentioning

confidence: 99%

Red Perovskite Light‐Emitting Diodes: Recent Advances and Perspectives

Tang

Wang

et al. 2022

Laser & Photonics Reviews

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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.

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Passivation Layer of Potassium Iodide Yielding High Efficiency and Stable Deep Red Perovskite Light-Emitting Diodes

Cited by 25 publications

References 64 publications

Luminescence and Degeneration Mechanism of Perovskite Light‐Emitting Diodes and Strategies for Improving Device Performance

Luminescence and Degeneration Mechanism of Perovskite Light‐Emitting Diodes and Strategies for Improving Device Performance

Materials, Device Structures, and Applications of Flexible Perovskite Light‐Emitting Diodes

Red Perovskite Light‐Emitting Diodes: Recent Advances and Perspectives

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