Facile synthesis of solution-processed MoS<sub>2</sub>nanosheets and their application in high-performance ultraviolet organic light-emitting diodes

Zhang, Xiaowen; Li, Wanshu; Ling, Zhitian; Zhang, Yan; Xu, Jiwen; Wang, Hua; Chen, Guohua; Wei, Bin

doi:10.1039/c8tc05370g

Cited by 41 publications

(18 citation statements)

References 75 publications

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“…On the other hand, device F1 has an impedance (Z) of ≈10 5 Ω and a phase angle (ϕ) of −60° at 1 V or less (Figure 5b), showing a high resistance state. [40][41][42][43] With the increase of voltage, Z decreases rapidly and the corresponding ϕ shifts to 0°, indicating a transition process from an insulating state to a semiconductor state. [44,45] The state transition voltage of device F1 is less than 4 V, revealing a good electrical performance.…”

Section: Characteristics and Mechanism Of The Cglmentioning

confidence: 99%

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoO_x and Ag Doped Planar Heterojunction

Niu

Gong

et al. 2022

Advanced Optical Materials

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commercialization of OLEDs, especially for the application in lighting, [6] but it is often hard to achieve both. High brightness requires high current density, [7] and the accompanying high temperature and Coulombic force degradation will greatly shorten the lifetime. [8][9][10][11][12] Tandem configuration, by using a charge generation layer (CGL) to connect several OLED units in series, is a practical strategy to optimize the lifetime of OLEDs while maintaining high luminance. [13,14] Under the same luminance, the current of each OLED unit can be reduced in the tandem structure, which efficiently extends the lifetime of the tandem OLEDs.CGLs in tandem OLEDs can separate carriers well and inject them into adjacent functional layers, functioning as a connector between the emitting units. [15,16] At present, CGLs are commonly based on metal, conductive oxides, and transition metal oxides, such as 4,7-diphenyl-1,10-phenanthroline (Bphen):Cs 2 CO 3 , N,N′-bis-(1-naphthalenyl)-N, N′-bis-phenyl-(1,1′-biphenyl)-4,4′-diamine (NPB):MoO 3 , and Bphen:Li. [17][18][19][20][21][22][23] On the other hand, organic p-n heterojunctions can also be used as the CGL. [24][25][26] The exciton can separate at the interface of the p-n junction induced by the external electric field so that electrons from the highest occupied molecular orbital (HOMO) of the p-type material can easily inject into the lowest unoccupied molecular orbital (LUMO) of the n-type material due to the small injection barrier. [15,27] In addition, the doped n-type material will simultaneously produce a much higher electron concentration, which facilitates the electron concentration and injection. [28,29] On the other hand, doped p-type material will induce an increase in the electrical conductivity caused by a charge transfer between the dopant and the p-type material, which will lead to an increase in the free hole concentration and hole injection. [28] Therefore, the performance of the tandem OLEDs can be significantly enhanced.Compared with the traditional tandem OLEDs, the inverted tandem OLEDs can well protect the water-and oxygen-sensitive n-type layer, thus obtaining a longer lifetime.

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Section: Characteristics and Mechanism Of The Cglmentioning

confidence: 99%

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoO_x and Ag Doped Planar Heterojunction

Niu

Gong

et al. 2022

Advanced Optical Materials

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“…TMDs can be also employed as HILs in OLEDs [39,41,[43][44][45]. Kim reported OLEDs with a structure of ITO/TMDs/NPB/Alq 3 :C545T/BCP/Alq 3 /LiF/Al, in which MoS 2 , WS 2 and TaS 2 nanosheets were used as HILs, as shown in Figure 3e [43].…”

Section: D Materials As Hole Injection Layer (Hil)mentioning

confidence: 99%

Improved Charge Injection and Transport of Light-Emitting Diodes Based on Two-Dimensional Materials

et al. 2019

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Light-emitting diodes (LEDs) are considered to be the most promising energy-saving technology for future lighting and display. Two-dimensional (2D) materials, a class of materials comprised of monolayer or few layers of atoms (or unit cells), have attracted much attention in recent years, due to their unique physical and chemical properties. Here, we summarize the recent advances on the applications of 2D materials for improving the performance of LEDs, including organic light emitting diodes (OLEDs), quantum dot light emitting diodes (QLEDs) and perovskite light emitting diodes (PeLEDs), using organic films, quantum dots and perovskite films as emission layers (EMLs), respectively. Two dimensional materials, including graphene and its derivatives and transition metal dichalcogenides (TMDs), can be employed as interlayers and dopant in composite functional layers for high-efficiency LEDs, suggesting the extensive application in LEDs. The functions of 2D materials used in LEDs include the improved work function, effective electron blocking, suppressed exciton quenching and reduced surface roughness. The potential application of 2D materials in PeLEDs is also presented and analyzed.

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“…[43] Nonetheless, only few works implement this scheme on LEDs, but the low concentration of exfoliated MoS2 used (~ 0.5 mg mL -1 ) did not allow to have a fair comparison with the reference device and/or UV-ozone irradiation treatment was still needed. [20,44,45 ] In this work we investigate the use of a nanocomposite aqueous ink, based on the mixture of PEDOT:PSS and highly concentrated MoS2 nanosheets, as HTL in NPL-LEDs. The aim of our study is to understand whether the addition of MoS2 to PEDOT:PSS can improve the drawbacks of this interface layer and have positive impact on the performance of corresponding device.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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Facile synthesis of solution-processed MoS₂nanosheets and their application in high-performance ultraviolet organic light-emitting diodes

Abstract: High-performance ultraviolet organic light-emitting diodes are assembled using liquid-phase exfoliated MoS2 and its composites, MoS2–UVO and MoS2+PEDOT:PSS.

Cited by 41 publications

References 75 publications

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoO_x and Ag Doped Planar Heterojunction

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoO_x and Ag Doped Planar Heterojunction

Improved Charge Injection and Transport of Light-Emitting Diodes Based on Two-Dimensional Materials

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

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Facile synthesis of solution-processed MoS2nanosheets and their application in high-performance ultraviolet organic light-emitting diodes

Abstract: High-performance ultraviolet organic light-emitting diodes are assembled using liquid-phase exfoliated MoS2 and its composites, MoS2–UVO and MoS2+PEDOT:PSS.

Cited by 41 publications

References 75 publications

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoOx and Ag Doped Planar Heterojunction

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoOx and Ag Doped Planar Heterojunction

Improved Charge Injection and Transport of Light-Emitting Diodes Based on Two-Dimensional Materials

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

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Product

Resources

About

Facile synthesis of solution-processed MoS₂nanosheets and their application in high-performance ultraviolet organic light-emitting diodes

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoO_x and Ag Doped Planar Heterojunction

High‐Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoO_x and Ag Doped Planar Heterojunction

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