Gaining Insight into the Underlayer Treatment for in Situ Fabrication of Efficient Perovskite Nanocrystal-Based Light-Emitting Diodes

Imran, Muhammad; Han, Dengbao; Ali, Shmshad; Zhang, Xin; Wang, Chenhui; Syed, Kazim; Chen, Yu; Chang, Shuai; Zou, B. S.; Zhong, Haizheng

doi:10.1021/acs.jpcc.9b04174

Cited by 9 publications

(8 citation statements)

References 57 publications

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“…In 2019, Zhong's group improved the HTL of PeLED and used oxygen plasma-treated PEDOT:PSS. [83] The surface of PEDOT:PSS was enriched with PSS after oxygen plasma treatment, and the material thickness was reduced, which promoted the crystallization and uniform growth of FAPbBr 3 nanocrystals on the surface and reduced cracks and pinholes. After 10 minutes of oxygen plasma treatment, the PLQY of the perovskite film increased from 42 % to 58.7 %, and the maximum brightness increased from 6865 cd/m 2 (4.3 V) to 19790 cd/m 2 (4.4 V).…”

Section: Light Emitting Diodementioning

confidence: 99%

“…Applied to PeLED, the luminous efficiency reached 403 cd/m 2 , the EQE reached 2.8 %, and as the voltage increases, it exhibited a stable emission peak. In 2019, Zhong's group improved the HTL of PeLED and used oxygen plasma‐treated PEDOT:PSS [83] . The surface of PEDOT:PSS was enriched with PSS after oxygen plasma treatment, and the material thickness was reduced, which promoted the crystallization and uniform growth of FAPbBr 3 nanocrystals on the surface and reduced cracks and pinholes.…”

Section: Application Of Organic‐inorganic Hybrid Perovskite Nanomatermentioning

confidence: 99%

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Organic‐Inorganic Hybrid Perovskite Nanomaterials: Synthesis and Application

Zhang

2020

ChemistrySelect

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In recent years, organic‐inorganic hybrid perovskite materials have drawn immense attention in the application of optoelectronic devices due to their superior semiconductor characteristics. Among them, organic‐inorganic hybrid perovskite nanomaterials with advantages such as long charge carrier diffusion lengths, high charge carrier mobilities, low trap‐state‐density, high photoluminescence quantum efficiency and low‐cost solution processability have shown great development potential in the field of semiconductor devices. In this review, we firstly summarize several synthesis strategies for organic‐inorganic hybrid perovskite nanomaterials, including template method, hot injection method, ligand‐assistant reprecipitation strategy, chemical vapor deposition method, microfluidic reactor method, ultrasound synthesis and mechanical ball milling method and analyze their own advantages and limitations. Subsequently, the research progress in applications in the field of light emitting diodes, solar cells, lasers and photodetectors are reviewed. At the end of this review, current challenges and future developments are discussed.

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Section: Light Emitting Diodementioning

confidence: 99%

Section: Application Of Organic‐inorganic Hybrid Perovskite Nanomatermentioning

confidence: 99%

Organic‐Inorganic Hybrid Perovskite Nanomaterials: Synthesis and Application

Zhang

2020

ChemistrySelect

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“…It has been reported that the substrate not only affects the carrier transport and recombination process during device operation , but also have a significant influence on the crystallization kinetics of perovskite films . Chang’s group used oxygen-plasma treatment to tune the morphology and surface molecular composition of the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) substrate that enabled them to achieve a 4-fold enhancement of current efficiency (CE) in green PeLEDs . Zhang and colleagues observed the existence of N–H hydrogen bonding between polymeric hole-transport materials as the substrates and the organic cation spacer, and suggested that such an interaction can significantly refine the grain size of quasi-2D perovskites .…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Role of Substrates on Domain Distribution of Quasi-2D Perovskites for Blue Light-Emitting Diodes

Cai

Ali

et al. 2021

ACS Appl. Electron. Mater.

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Perovskite light-emitting diodes (PeLEDs) have been developed at a rapid pace with high external quantum efficiencies (EQEs) surpassing 20% for red, infrared, and green emissions; nevertheless, the performance of their blue-emitting cousins remains relatively quite low. Among various crucial factors that could impact these solution-processed devices, selection of a suitable underlayer (usually a hole-transport layer) is critical to the quality of resulting perovskite films. Particularly, the role of the substrate is highly important in the case of quasi-2D perovskite films where the emission occurs as a result of cascade energy transfer among various perovskite domains with different numbers of lead-halide octahedral layers (n) sandwiched between long-chain organic molecules. Herein, we explored the impact of the substrate on domain distribution of quasi-2D perovskite films, and a series of efficient and color-stable blue PeLEDs is attained through precise stoichiometric engineering. By employing a range of characterization tools, we thoroughly investigated the crystallization mechanism of quasi-2D perovskites on different substrates, including poly(3,4ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and poly[(9,9-dioctylfluorenyl-2,7-diyl)-co -(4,4′-( N -(4-sec-butylphenyl)diphenylamine)] (TFB). Perovskite films spin-coated on PEDOT:PSS exhibited cyan emission from the n ≥ 4 quasi-2D phase with uniformly distributed small grains. In contrast, perovskite layers formed on TFB featured an island morphology and showed blue emission from the quasi-2D phase with n-values between 2 and 4. In addition, we examined how the variation of A-site cations affects the optical properties of quasi-2D perovskites. Consequently, PEDOT:PSSbased champion PeLED exhibited cyan emission at 495 nm with a maximum EQE of 6.73%, whereas TFB-based counterparts manifested blue emission at 486 nm with a peak EQE of 3.95%. We anticipate that our work will provide a fundamental guideline to rationally selecting the substrates for the optimized growth of quasi-2D perovskites toward high-efficiency PeLEDs.

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“…We invoke a simple and facile method, oxygen-plasma treatment on the PEDOT:PSS film, 30 to modulate the HIL/ HTL interface. PEDOT:PSS films were treated by oxygen plasma for 4 min (see Supporting Information for details).…”

mentioning

confidence: 99%

Design of the Hole-Injection/Hole-Transport Interfaces for Stable Quantum-Dot Light-Emitting Diodes

Zheng

Chen

et al. 2020

J. Phys. Chem. Lett.

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Extensive efforts have been devoted to improving the operational performance of quantum-dot light-emitting diodes (QLEDs). However, the fundamental understanding of the relationship between the design of the hole-injection layer (HIL)/hole-transporting layer (HTL) interface and the operational stability of QLEDs is limited. Here, we demonstrate that in the operation of red QLEDs, the leakage electrons induce in situ electrochemical reduction reactions of the polyfluorene HTLs, which in consequence create trap states and deteriorate charge-transport properties. We invoke an oxygen-plasma treatment on the PEDOT:PSS HILs, resulting in HIL/HTL interfaces with enhanced hole-injection properties. This simple method leads to more efficient exciton generation in the QDs layer and mitigated leakage electron-induced degradation of the HTLs, enabling red-emitting QLEDs with improved operational performance, i.e., high external quantum efficiency of >20.0% at a brightness ranging from 1000 to 10 000 cd m–2 and a long T 95 operational lifetime of ∼4200 h at 1000 cd m–2.

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Gaining Insight into the Underlayer Treatment for in Situ Fabrication of Efficient Perovskite Nanocrystal-Based Light-Emitting Diodes

Cited by 9 publications

References 57 publications

Organic‐Inorganic Hybrid Perovskite Nanomaterials: Synthesis and Application

Organic‐Inorganic Hybrid Perovskite Nanomaterials: Synthesis and Application

Elucidating the Role of Substrates on Domain Distribution of Quasi-2D Perovskites for Blue Light-Emitting Diodes

Design of the Hole-Injection/Hole-Transport Interfaces for Stable Quantum-Dot Light-Emitting Diodes

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