A Light Scattering Layer for Internal Light Extraction of Organic Light-Emitting Diodes Based on Silver Nanowires

Lee, Keunsoo; Shin, Jong-Yeol; Park, Jun-Hwan; Lee, Jonghee; Joo, Chul Woong; Lee, Jeong Ik; Cho, Doo Hee; Lim, Jong Tae; Oh, Min Cheol; Ju, Byeong Kwon; Moon, Jaehyun

doi:10.1021/acsami.6b02924

Cited by 52 publications

(28 citation statements)

References 42 publications

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“…When compared with a reference device, the fabricated flex‐OLEDs based on this scattering layer displayed a 24% increase in EQE. Scattering layer with nanodots were suggested as well by Moon et al for the purpose of reducing the waveguide mode, which made EQE optimized to be 65.3% with negligible spectra variance . Apart from the embedded nanoparticles, a thin film of microporous PI on the backside of AgNWs electrode embedded in neat colorless PI is also effective in enhancing the outcoupling efficiency massively .…”

Section: Progresses Of Highly Efficient Flexible Displaysmentioning

confidence: 99%

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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Section: Progresses Of Highly Efficient Flexible Displaysmentioning

confidence: 99%

Emerging Self‐Emissive Technologies for Flexible Displays

2019

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“…AgNWs are now being used as a substitute for indium tin oxide (ITO), which is the dominant transparent conductor material. In addition, AgNWs are now regarded as the next generation of flexible transparent materials and have been used in the fields of solar cells [8,9], organic lightemitting diodes (OLEDs) [10], flexible liquid crystal displays (LCDs) [11], and even medical textiles.…”

Section: Introductionmentioning

confidence: 99%

High-Yield Synthesis of Long Silver Nanowires via Chromic Chloride and a Stable Reaction Environment

Zhang

Dang

Cao

et al. 2019

Journal of Nanomaterials

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The search for suitable synthesis methods and parameters capable of controlling the length, diameter, and yield of silver nanowires (AgNWs) is still an emerging strategy today. Therefore, a method for high-yield synthesis of long AgNWs via chromic chloride and a stable reaction environment was proposed. The results show that Cr3+ could restore the adsorbed atomic oxygen quickly and provide a high efficiency in the prevention of the oxidative etching, for the ion of Cr2+ oxidized to Cr3+ has a lower standard electrode potential, and a more stable reaction environment provided by the coupling method could avoid disturbing the growth of the {111} reactive sites of the wires; then, the yield and length of the AgNWs were improved. The length of the AgNWs was over 75 μm and even 160 μm; the yield of the AgNWs was over 90%, which provides the referable basis for the synthesis of ultralong AgNWs.

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“…It has been widely accepted that organic light emitting diodes (OLEDs) have light extraction efficiencies of ~20% if a light extraction technique is not applied to OLEDs [1]. Even though a lot of methods have been presented to overcome the limits [2][3][4][5][6][7], a simple and highly massproducible technology that OLED producers want has been little announced. We paid attention to the uneven surface of a micro-lens array (MLA) [8][9], to be inspired by it.…”

Section: Introductionmentioning

confidence: 99%

12‐3: A Highly Mass‐producible Nano‐lens Array Technology for Optically Efficient Full‐color Organic Light Emitting Diode Display Applications

Park

Han

Cho

et al. 2019

Symp Digest of Tech Papers

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Recently, we have reported that a nano-lens array (NLA) technology using a very simple and fab-compatible vacuum deposition process contributes to highly efficient and color stable green and blue organic light emitting diodes (OLEDs). Here, the technique is applied to red OLEDs. With NLA, the increase ratio of current efficiency is about 1.57 which is similar to those of green and blue OLEDs (1.56, 1.59) . Furthermore, color coordinate change measurement values of red OLEDs in a wide viewing angle ranging from 0 o to 60 o are reduced as green and blueOLEDs do, indicating that NLA has a great potential for the development of the optically efficient full-color OLED displays composed of three color OLED pixels.

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A Light Scattering Layer for Internal Light Extraction of Organic Light-Emitting Diodes Based on Silver Nanowires

Cited by 52 publications

References 42 publications

Emerging Self‐Emissive Technologies for Flexible Displays

Emerging Self‐Emissive Technologies for Flexible Displays

High-Yield Synthesis of Long Silver Nanowires via Chromic Chloride and a Stable Reaction Environment

12‐3: A Highly Mass‐producible Nano‐lens Array Technology for Optically Efficient Full‐color Organic Light Emitting Diode Display Applications

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