Highly efficient flexible quantum-dot light emitting diodes with an ITO/Ag/ITO cathode

Ji, Wenyu; Wang, Ting; Zhu, Bingyan; Zhang, Han; Wang, Rong; Zhang, Dandan; Chen, Liezun; Yang, Qingyi; Zhang, Hanzhuang

doi:10.1039/c7tc00514h

Cited by 43 publications

(34 citation statements)

References 33 publications

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“…The ITO−Ag−ITO hybrid electrode was also reported on as a flexible cathode for QDLEDs due to its low sheet resistance, high transmittance, and outstanding mechanical flexibility. Ji et al . fabricated red (R), green (G), and blue (B) QDLEDs on ITO/Ag/ITO top cathodes and showed maximum current efficiencies of 16.3, 86.5, and 16.1 cd/A and luminance of 89080, 280000, and 13976 cd/m 2 for RGB QDLEDs as shown in Figure .…”

Section: Transparent Conducting Electrodes For Quantum Dots Light Emimentioning

confidence: 99%

“…[133] flexibility. Ji et al [134] fabricated red (R), green (G), and blue (B) QDLEDs on ITO/Ag/ITO top cathodes and showed maximum current efficiencies of 16.3, 86.5, and 16.1 cd/A and luminance of 89080, 280000, and 13976 cd/m 2 for RGB QDLEDs as shown in Figure 27.…”

Section: Hybrid Electrodes For Qdledsmentioning

confidence: 99%

“…To solve this problems, several alternatives such amorphous oxide electrodes, metal grid (mesh), metal nanowire, metal network, carbon nanotube (CNT), graphene, graphene oxide, conducting polymer, and hybrid electrodes have been extensively reported. [10][11][12][13][14][15][16][17][18] In fabricating QDLEDs, several new TCE materials have been employed as anodes or cathodes for hole/ electron injection. With this review, we report on recent research developments in TCEs for QDLEDs.…”

Section: Introductionmentioning

confidence: 99%

“…However, the brittleness of ITO and FTO electrodes prevent their use as flexible TCEs for flexible QDLEDs. To solve this problems, several alternatives such amorphous oxide electrodes, metal grid (mesh), metal nanowire, metal network, carbon nanotube (CNT), graphene, graphene oxide, conducting polymer, and hybrid electrodes have been extensively reported . In fabricating QDLEDs, several new TCE materials have been employed as anodes or cathodes for hole/electron injection.…”

Section: Introductionmentioning

confidence: 99%

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Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

Seok

Lee

Park

et al. 2019

Israel Journal of Chemistry

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In this review, we briefly describe a recent research development of transparent conducting electrodes (TCEs) for next‐generation quantum dot‐based light‐emitting diodes (QDLEDs). Although sputtered Sn‐doped In2O3 (ITO) and chemically grown F‐doped SnO2 (FTO) electrodes have mainly been employed as transparent electrodes for QDLEDs, there have been great advances in TCE materials and fabrication processes. This review presents important characteristics of various TCE and applications in QDLEDs as a transparent cathode or anode. In particular, we will focus on characteristics of metal grids, metal nanowire, carbon nanotube, graphene, and hybrid electrodes for QDLEDs as promising alternatives to typical ITO and FTO electrodes. In addition, we discuss the current status of transparent conducting oxide‐based QDLEDs. By comparing the performances of QDLED with different TCEs, we suggest promising alternatives ITO or FTO electrodes.

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Section: Transparent Conducting Electrodes For Quantum Dots Light Emimentioning

confidence: 99%

Section: Hybrid Electrodes For Qdledsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

Seok

Lee

Park

et al. 2019

Israel Journal of Chemistry

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“…As an alternative to organic lighting emitting diodes (OLEDs), the quantum dot lighting emitting diodes (QD‐LEDs) have been extensively investigated due to their attractive merits over other large‐area LED technologies, because of the color tenability by QD size control and the narrow full width at half maximum (FWHM) of emission wavelength . In normal QD‐LEDs, sputtered Sn‐doped In 2 O 3 (ITO) film and solution processed poly(3,4‐ethylenedioxythiophenc):poly(styrenesulfonate) (PEDOT:PSS) have been widely used as transparent electrode and hole injection layer (HIL) .…”

Section: Introductionmentioning

confidence: 99%

P‐type Sb‐doped Cu₂O Hole Injection Layer Integrated on Transparent ITO Electrode for Acidic PEDOT:PSS‐Free Quantum Dot Light Emitting Diodes

Seo

Lee

Heo

et al. 2019

Physica Status Solidi (a)

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It is developed that transparent p-type Sb-doped cuprous oxide (ACO) integrated Sn-doped In 2 O 3 (ITO) film as hole injection layer (HIL) and anode combined electrodes for quantum dot light emitting diodes (QD-LEDs) to substitute acidic PEDOT:PSS HIL based electrode. By graded co-sputtering of ACO and ITO targets, the graded p-type ACO buffer layer can be integrated on the surface region of the ITO electrodes. P-type conductivity of the ACO film for acting as effective HIL in QD-LEDs is confirmed by a positive Hall coefficient (1.74 Â 10 À3 ohm cm 3 /C) and a positive Seebeck constant (115 mV K À1 ). Due to the well-matched work function of p-type ACO on the ITO electrodes, the acidic PEDOT:PSS-free QD-LEDs exhibited typical currentvoltage-luminescence of QD-LEDs. The successful operation of PEDOT:PSSfree QD-LED with p-type ACO integrated ITO electrode indicates that ACO and ITO anode graded sputtering is simpler fabrication steps for costeffective QD-LEDs and elimination of interfacial reactions caused by the acidic PEDOT:PSS layer for reliable QD-LEDs.

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Emerging Self‐Emissive Technologies for Flexible Displays

2019

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in the connection between software and hardware and function as the direct information transfer windows, have improved substantially since their invention. [4] Actually, as one representative technology, flexible active-matrix organic light-emitting diodes (flex-AMOLEDs) have been made a huge success in commercialization due to the popularization of high-resolution TVs, smartphones, and solid state illuminations. As shown by IHS Markit, the shipments of flex-AMOLED displays are expected to surge to as many as 335.7 million units by 2020 as the demand for such panels continues a strong growth, which accounts for as high as 52.0% of total AMOLED panel shipments and this value reached 38.9% in 2018. [5] The promising prospect faced by flexible displays in the market serves as a testament to their great potential in the future.From a technical perspective, for ideal flexible displays, a number of parameters ought to be satisfied at the same time, including self-emissive characters, excellent mechanical flexibility, low powerconsumption, long-term stability, compatibility with solution processing as well as low cost for mass production, as shown in Figure 1. At present, depending on the emitting-active materials, which define the emission qualities and characteristics of the devices, the self-emissive flexible displays can be categorized into flexible organic light-emitting diodes (flex-OLEDs), flexible quantum dot light-emitting diodes (flex-QLEDs) and flexible perovskite light-emitting diodes (flex-PeLEDs). Derived from the loose van der Waals bonds between organic molecules, excellent mechanical flexibilities have been regarded as one of the intrinsic properties required for organic materials. Thus, in 1992, the first full flexible self-emissive device was created by fabricating a polymer OLED on a poly(ethylene terephthalate) (PET) substrate, which opened up a brand-new era for future displays. [6] From that point on, thanks to the emergence of the phosphorescent emitters and the recently reported thermally activated delayed fluorescence (TADF) emitters as well as the fast-paced advancement of device structure design and manufacturing techniques, both the theoretical and experimental maximum efficiencies of flex-OLEDs have improved considerably, which finally contributes to the success in commercialization of this technology. [7,8] Regarding flex-QLEDs, despite their superiority in high efficiency, low cost, solution-process compatibility and high color-purity, the progress of such devices is significantly slower as compared Featuring a combination of ultrathin and lightweight properties, excellent mechanical flexibility, low power-consumption, and widely tunable saturated emission, flexible displays have opened up a new possibility for optoelectronics. The demands for flexible displays are growing on a continual basis due not only to their successful commercialization but, more importantly, their endless possibilities for wearable integrated systems. Up to now, self-emissive technologies for displays, flexible ac...

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Highly efficient flexible quantum-dot light emitting diodes with an ITO/Ag/ITO cathode

Abstract: Flexible quantum dot light emitting diodes (QLEDs) are highly desired due to their advantages of foldability, lightweight, and potential applications in lighting and displays.

Cited by 43 publications

References 33 publications

Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

P‐type Sb‐doped Cu₂O Hole Injection Layer Integrated on Transparent ITO Electrode for Acidic PEDOT:PSS‐Free Quantum Dot Light Emitting Diodes

Emerging Self‐Emissive Technologies for Flexible Displays

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Highly efficient flexible quantum-dot light emitting diodes with an ITO/Ag/ITO cathode

Abstract: Flexible quantum dot light emitting diodes (QLEDs) are highly desired due to their advantages of foldability, lightweight, and potential applications in lighting and displays.

Cited by 43 publications

References 33 publications

Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

P‐type Sb‐doped Cu2O Hole Injection Layer Integrated on Transparent ITO Electrode for Acidic PEDOT:PSS‐Free Quantum Dot Light Emitting Diodes

Emerging Self‐Emissive Technologies for Flexible Displays

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P‐type Sb‐doped Cu₂O Hole Injection Layer Integrated on Transparent ITO Electrode for Acidic PEDOT:PSS‐Free Quantum Dot Light Emitting Diodes