Ag nanowire-based electrodes for improving the output power of ultraviolet AlGaN-based light-emitting diodes

Park, Jae-Seong; Kim, Jae Ho; Na, Jin Young; Kim, Dae Hyun; Kang, Daesung; Kim, Sun Kyung; Seong, Tae Yeon

doi:10.1016/j.jallcom.2017.01.351

Cited by 15 publications

(10 citation statements)

References 30 publications

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“…The current choice for flexible TEs is indium tin oxide (ITO) because it has high optical transparency and electrical conductivity; however, its brittle nature under deformation limits its use in flexible electronics [13,14]. Several candidates to replace ITO have been proposed, including carbon nanotubes [15,16], graphene [17,18], and metal nanowires [19,20]. Of these alternatives, Ag nanowires are considered the most promising due to their higher optical and electrical performance as TEs compared to carbon-based materials [21,22].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Urethane Acrylate-Based Photosensitive Coating on the Reliability of Ag Nanowire Transparent Electrodes

Seo

Matteini

et al. 2021

Applied Sciences

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Due to the susceptibility of Ag nanowires to external mechanical and chemical damage, maintaining high optical performance and ambient and mechanical stability during the fabrication process is important for the industrial use of Ag nanowire transparent electrodes (TEs). In this study, urethane acrylate-based photosensitive resin (UAPR) is used as the coating material for Ag nanowire TEs to improve their optical transmittance, ambient stability, and resistance to external wiping damage. In the proposed method, UV-curable UAPR is coated onto Ag nanowire TEs using a simple doctor blade, forming a protective coating that increases the optical transmittance of the electrodes due to the refractive index of the UAPR between the air and the substrate. The UAPR coating successfully protects the Ag nanowires from corrosion in ambient air, with no significant change in their optical or electrical properties observed after 180 h of exposure to ambient air. Mechanical wiping tests also confirm that the UAPR coating is effective in protecting the Ag nanowires from external wiping damage, with no degradation of the optical or electrical properties observed after six wiping cycles.

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Section: Introductionmentioning

confidence: 99%

Effect of a Urethane Acrylate-Based Photosensitive Coating on the Reliability of Ag Nanowire Transparent Electrodes

Seo

Matteini

et al. 2021

Applied Sciences

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“…One of the main causes of the low EQE of NUV LEDs is their low light extraction efficiency (LEE), which is caused by the total internal reflection by the refractive index difference between the semiconductor and air [5]. Various approaches have been used to enhance the LEE of NUV LEDs, such as surface plasmon enhancement [6][7][8], surface roughening [9][10][11], aluminum (Al) nelectrodes [12], periodic hole patterns [13], additional silver nanostructures [14][15][16][17], and Al-doped indium tin oxide (ITO) electrodes [18].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Optical Output of Near-Ultraviolet Light-Emitting Diodes by a Monolayer of Nanospheres

Wan

Chen

et al. 2020

Journal of Nanomaterials

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The optical output of near-ultraviolet (NUV) light-emitting diodes (LEDs) was improved by including a monolayer of hexagonal close-packed polystyrene (PS) nanospheres. PS nanospheres with different sizes were deposited on the indium tin oxide layer of the NUV LEDs. The electroluminescence results showed that the light extraction efficiency of the NUV LEDs was increased by the inclusion of PS nanospheres, and the maximum optical output enhancement was obtained when the size of the nanospheres was close to the light wavelength. The largest enhancement of the optical output of 1.27-fold was obtained at an injection current of 100 mA. The enhanced optical output was attributed to part of the incident light beyond the critical angle being extracted when the exit surface of the NUV LEDs had a PS nanosphere monolayer. This method may serve as a low-cost and effective approach to raise the efficiency of NUV LEDs.

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“…Thus, p-type electrodes possessing low contact resistivity as well as high transmittance have been extensively studied. Several kinds of transparent conductive layer such as metal nanowires [ 13 , 14 , 15 , 16 ], graphene [ 17 , 18 , 19 ], carbon nanotubes [ 20 , 21 ], and conductive polymers [ 22 , 23 , 24 ] have been reported to improve the current spreading of LEDs. For top-emitting LEDs, indium-tin-oxide (ITO) has been widely used to increase current spreading uniformity over the entire active region due to its high optical transmittance and excellent electrical conductivity [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement in Light Output of Ultraviolet Light-Emitting Diodes with Patterned Double-Layer ITO by Laser Direct Writing

et al. 2019

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A patterned double-layer indium-tin oxide (ITO), including the first unpatterned ITO layer serving as current spreading and the second patterned ITO layer serving as light extracting, was applied to obtain uniform current spreading and high light extraction efficiency (LEE) of GaN-based ultraviolet (UV) light-emitting diodes (LEDs). Periodic pinhole patterns were formed on the second ITO layer by laser direct writing to increase the LEE of UV LED. Effects of interval of pinhole patterns on optical and electrical properties of UV LED with patterned double-layer ITO were studied by numerical simulations and experimental investigations. Due to scattering out of waveguided light trapped inside the GaN film, LEE of UV LED with patterned double-layer ITO was improved as compared to UV LED with planar double-layer ITO. As interval of pinhole patterns decreased, the light output power (LOP) of UV LED with patterned double-layer ITO increased. In addition, UV LED with patterned double-layer ITO exhibited a slight degradation of current spreading as compared to the UV LED with a planar double-layer ITO. The forward voltage of UV LED with patterned double-layer ITO increased as the interval of pinhole patterns decreased.

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Ag nanowire-based electrodes for improving the output power of ultraviolet AlGaN-based light-emitting diodes

Cited by 15 publications

References 30 publications

Effect of a Urethane Acrylate-Based Photosensitive Coating on the Reliability of Ag Nanowire Transparent Electrodes

Effect of a Urethane Acrylate-Based Photosensitive Coating on the Reliability of Ag Nanowire Transparent Electrodes

Enhanced Optical Output of Near-Ultraviolet Light-Emitting Diodes by a Monolayer of Nanospheres

Improvement in Light Output of Ultraviolet Light-Emitting Diodes with Patterned Double-Layer ITO by Laser Direct Writing

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