Pressure Welding of Silver Nanowires Networks at Room Temperature as Transparent Electrodes for Efficient Organic Light‐Emitting Diodes

Abstract

In this work, polymethylmethacrylate (PMMA) as a superior mediate for the pressure welding of silver nanowires (Ag NWs) networks as transparent electrodes without any thermal treatment is demonstrated. After a pressing of 200 kg cm , not only the sheet resistance but also the surface roughness of the PMMA-mediated Ag NWs networks decreases from 2.6 kΩ sq to 34.3 Ω sq and from 76.1 to 12.6 nm, respectively. On the other hand, high transparency of an average transmittance in the visible wavelengths of 93.5% together with a low haze value of 2.58% can be achieved. In terms of optoelectronic applications, the promising potential of the PMMA-mediated pressure-welded Ag NWs networks used as a transparent electrode in a green organic light-emitting diode (OLED) device is also demonstrated. In comparison with the OLED based on commercial tin-doped indium oxide electrode, the increments of power efficiency and external quantum efficiency (EQE) from 80.1 to 85.9 lm w and 19.2% to 19.9% are demonstrated. In addition, the PMMA-mediated pressure welding succeeds in transferring Ag NWs networks to flexible polyethylene naphthalate and polyimide substrates with the sheet resistance of 42 and 91 Ω sq after 10 000 times of bending, respectively.

Bifilar‐Pendulum‐Assisted Multilayer‐Structured Triboelectric Nanogenerators for Wave Energy Harvesting

“…Based on the advantages of light‐weight, [ 4 ] low cost, [ 5,6 ] simple structure, [ 7 ] diverse material options [ 8 ] and high efficiency at the low‐frequency, [ 3 ] the triboelectric nanogenerator (TENG) is widely applied in the micro/nanoenergy, [ 5,6 ] self‐powered sensing, [ 9 ] environmental protection, and flexible electronics applications. [ 10 ] Meanwhile, with the merits of light‐weight, [ 4 ] low‐cost, [ 5,6 ] and high‐efficiency in low frequency (<5 Hz), [ 3 ] TENG, based on the triboelectrification effect and electrostatic induction, [ 11–13 ] shows many superiorities in wave energy harvesting. [ 14,15 ] Therefore, TENG (Figure S1A, Supporting Information) has been regarded as a potential technology instead of linear permanent magnet generators for harvesting low‐frequency water wave energy.…”

High energy electron beam stimulated nanowelding of silver nanowire networks encapsulated with graphene for flexible and transparent electrodes

“…To overcome these issues, the complementary hybridization of nanostructures, in terms of their properties and effective welding processes to decrease the junction resistance, are highly required 13 . In previous studies, welding processes for randomly networked metallic NWs with low sheet resistance have included plasma treatment, UV-pulsed laser irradiation, thermal annealing, and pressure welding 14–18 . However, these approaches suffer from limitations such as requirements of large-scale fabrication and low-temperature processes for the application of plastic substrates for flexible nanoelectronics.…”

High-Uniformity Planar Mini-Chip-Scale Packaged LEDs with Quantum Dot Converter for White Light Source

“…As a new type of fluorescent semiconductor nanocrystals, nano quantum dots (QDs) have many unique optical properties, such as high photoluminescence quantum yield, narrow emission spectrum, tunable emission spectrum, and high color purity [10][11][12][13][14][15][16]. It has been demonstrated that in the efficient photon management, QD converter can be widely used in solar cells [17,18], LEDs [19,20], and photodetectors [21][22][23].…”