Hybrid MoS<sub>2</sub>/PEDOT:PSS transporting layers for interface engineering of nanoplatelet-based light-emitting diodes

Sorrentino, R.; Worsely, Robyn; Lagonegro, Paola; Martella, Christian; Alieva, Adriana; Scavia, Guido; Galeotti, Francesco; Pasini, Mariacecilia; Dubertret, Benoît; Brovelli, Sergio; Molle, Alessandro; Casiraghi, Cinzia; Giovanella, Umberto

doi:10.1039/d1dt01066b

Cited by 3 publications

(7 citation statements)

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“…As a proof-of-concept demonstration of the practical merits of the prepared MSO NWs in enhancing the performance of QLEDs, they were blended into a PEDOT/PSS solution and spin-coated as HIL. Fine powders of MSO NWs were dissolved in DI water (1 mg/mL) and mixed with the PEDOT/PSS solution in different volume ratios of 0, 3, 7, and 10%, instead of the solid fraction ratio such as that in ref . The device structure is typically designed as anode/HIL/HTL/emitter layer (EML)/electron transport layer (ETL)/cathode in which all the layers were spin-coated except the anode and cathode.…”

Section: Resultsmentioning

confidence: 99%

“…Nonetheless, there is a decrease in EL intensity, luminance, and EQE of QLED, compared to the pristine PEDOT:PSS, upon the addition of 3% of MSO NWs. This can be either due to the change in the surface thickness/roughness of the deposited HIL or an increase in the energy barrier for hole injection upon the initial addition of MSO NWs . However, with a further increase in the concentration of MSO to 7%, there is a dramatic enhancement in the QLED optoelectronic features.…”

Section: Resultsmentioning

confidence: 99%

“…This can be either due to the change in the surface thickness/ roughness of the deposited HIL or an increase in the energy barrier for hole injection upon the initial addition of MSO NWs. 18 However, with a further increase in the concentration of MSO to 7%, there is a dramatic enhancement in the QLED optoelectronic features. Indeed, the luminance and EQE increased from 44,330 cd.m −2 and 1.6% to 60,510 cd.m −2 and 1.9%, respectively.…”

Section: Synthesis Of Qdsmentioning

confidence: 99%

“…Sorrentino et al have used MoS 2 nanosheets to show that the addition of this watersoluble and highly concentrated solvent to the PEDOT: PSS layer can boost the efficiency of Cd-based QLED while improving the stability up to 41 days. 18 However, they have used bulk MoS 2 powders to prepare their nanocomposites. Singh et al recently reported a synthesis approach for the preparation of MoS 2 /MoO 3 nanocomposite as a gas-sensing agent.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nonetheless, in most cases, minimal attention has been dedicated to the synthesis of such MoO 3 or MoS 2 nanoparticles. Sorrentino et al have used MoS 2 nanosheets to show that the addition of this water-soluble and highly concentrated solvent to the PEDOT: PSS layer can boost the efficiency of Cd-based QLED while improving the stability up to 41 days . However, they have used bulk MoS 2 powders to prepare their nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Nanowire-Shaped MoS₂@MoO₃ Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

Bastami

Soheyli

Arslan

et al. 2022

ACS Appl. Electron. Mater.

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Molybdenum disulfides and molybdenum trioxides are structures that possess the potential to work as efficient charge transport layers in optoelectronic devices. In the present study, as opposed to the existing Mo-based nanostructures in flake, sheet, or spherical forms, an extremely simple and low-cost hydrothermal method is used to prepare nanowires (NWs) of MoS2@MoO3 (MSO) composites. The synthesis method includes several advantages including easy handling and processing of inexpensive precursors to reach stable MSO NWs without the need for an oxygen-free medium, which would facilitate the possibility of mass production of these nanostructures. The structural analysis confirmed the formation of MSO nanocomposites with different Mo valence states, as well as NWs of average length and diameter of 70 nm and 5 nm, respectively. In order to demonstrate their potential for optoelectronic applications, MSO NWs were blended into hole injection layers (HILs) in quantum dot-based light-emitting diodes (QLEDs). Electroluminescence measurements show a substantial enhancement in both luminance (from 44,330 to 68,630 cd.m–2) and external quantum efficiency (from 1.6 to 2.3%), based on the increase in the ratio of MSO NWs from 3 to 10%. Interestingly, the addition of 10% volume of MSO NWs resulted in a remarkably smoother HIL with improved current efficiency and stability in green-emitting QLEDs. The simplicity and cost-effective features of the synthesis method along with outstanding favorable morphology demonstrated their ability to enhance the QLED performance and mark them as promising agents for optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of Qdsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nanowire-Shaped MoS₂@MoO₃ Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

Bastami

Soheyli

Arslan

et al. 2022

ACS Appl. Electron. Mater.

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2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Diroll

Güzeltürk

et al. 2023

Chem. Rev.

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The field of colloidal synthesis of semiconductors emerged 40 years ago and has reached a certain level of maturity thanks to the use of nanocrystals as phosphors in commercial displays. In particular, II−VI semiconductors based on cadmium, zinc, or mercury chalcogenides can now be synthesized with tailored shapes, composition by alloying, and even as nanocrystal heterostructures. Fifteen years ago, II−VI semiconductor nanoplatelets injected new ideas into this field. Indeed, despite the emergence of other promising semiconductors such as halide perovskites or 2D transition metal dichalcogenides, colloidal II−VI semiconductor nanoplatelets remain among the narrowest room-temperature emitters that can be synthesized over a wide spectral range, and they exhibit good material stability over time. Such nanoplatelets are scientifically and technologically interesting because they exhibit optical features and production advantages at the intersection of those expected from colloidal quantum dots and epitaxial quantum wells. In organic solvents, gram-scale syntheses can produce nanoparticles with the same thicknesses and optical properties without inhomogeneous broadening. In such nanoplatelets, quantum confinement is limited to one dimension, defined at the atomic scale, which allows them to be treated as quantum wells. In this review, we discuss the synthetic developments, spectroscopic properties, and applications of such nanoplatelets. Covering growth mechanisms, we explain how a thorough understanding of nanoplatelet growth has enabled the development of nanoplatelets and heterostructured nanoplatelets with multiple emission colors, spatially localized excitations, narrow emission, and high quantum yields over a wide spectral range. Moreover, nanoplatelets, with their large lateral extension and their thin short axis and low dielectric surroundings, can support one or several electron−hole pairs with large exciton binding energies. Thus, we also discuss how the relaxation processes and lifetime of the carriers and excitons are modified in nanoplatelets compared to both spherical quantum dots and epitaxial quantum wells. Finally, we explore how nanoplatelets, with their strong and narrow emission, can be considered as ideal candidates for pure-color light emitting diodes (LEDs), strong gain media for lasers, or for use in luminescent light concentrators.

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Optical Limiting Performance of MoS₂ Nanosheets Exfoliated via Liquid-Phase Sonication: Implications for Laser Shielding

Rafi,

Little Flower

et al. 2024

ACS Appl. Nano Mater.

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The utilization of two-dimensional (2D) materials in optoelectronic devices has witnessed a surge. Production of 2D ultrathin molybdenum disulfide (MoS 2 ) nanosheets without the use of toxic precursors and without altering the phase of the material is still a task. We developed a cost-effective liquid-phase exfoliation method that is free of additives, utilizing ultrasound to produce a significant amount of nearly single-layered MoS 2 nanosheets by employing isopropyl alcohol and deionized water as a cosolvent. This work addresses the deficiencies in the current state-of-the-art studies by exploring the mechanism governing ultrasonic cavitation, resulting in MoS 2 nanosheets. Various sonication durations were altered to investigate the relationship between the duration of sonication and the dimensionality of the resulting nanosheets. The findings revealed that prolonged sonication durations yielded bilayered and trilayered nanosheets. The reduction in layer thickness was confirmed by Raman modes as the sonication time increased. Size-dependent optical studies indicated that the optical properties have enhanced as the sonication time increased. An open-aperture Z-scan investigation was conducted to explore the size-dependent nonlinear optical features of MoS 2 nanosheets, employing a 532 nm neodymium-doped yttrium aluminum garnet pulsed laser in a nanosecond pulsed regime. The optical limiting performance of the nanosheets sonicated at various time intervals was accessed and it was observed that as the nanosheets' thickness decreases, the optical limiting behavior improves. Due to two-photon absorption, MoS 2 nanosheets display optical limiting behaviors through reverse saturable absorption. Optical limiting thresholds as low as 2.98 × 10 12 W/m 2 are attained. This significant enhancement suggests that these ultrathin MoS 2 nanosheets are suitable for applications in laser shielding.

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Hybrid MoS₂/PEDOT:PSS transporting layers for interface engineering of nanoplatelet-based light-emitting diodes

Abstract: Colloidal semiconductor nanoplatelets (NPLs) are a subgroup of quantum confined materials that have recently emerged as promising active material for solution processed light-emitting diodes (LEDs) thanks to their peculiar structural...

Cited by 3 publications

References 62 publications

Nanowire-Shaped MoS₂@MoO₃ Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

Nanowire-Shaped MoS₂@MoO₃ Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Optical Limiting Performance of MoS₂ Nanosheets Exfoliated via Liquid-Phase Sonication: Implications for Laser Shielding

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Hybrid MoS2/PEDOT:PSS transporting layers for interface engineering of nanoplatelet-based light-emitting diodes

Abstract: Colloidal semiconductor nanoplatelets (NPLs) are a subgroup of quantum confined materials that have recently emerged as promising active material for solution processed light-emitting diodes (LEDs) thanks to their peculiar structural...

Cited by 3 publications

References 62 publications

Nanowire-Shaped MoS2@MoO3 Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

Nanowire-Shaped MoS2@MoO3 Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

2D II–VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration

Optical Limiting Performance of MoS2 Nanosheets Exfoliated via Liquid-Phase Sonication: Implications for Laser Shielding

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Product

Resources

About

Hybrid MoS₂/PEDOT:PSS transporting layers for interface engineering of nanoplatelet-based light-emitting diodes

Nanowire-Shaped MoS₂@MoO₃ Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

Nanowire-Shaped MoS₂@MoO₃ Nanocomposites as a Hole Injection Layer for Quantum Dot Light-Emitting Diodes

Optical Limiting Performance of MoS₂ Nanosheets Exfoliated via Liquid-Phase Sonication: Implications for Laser Shielding