Solution-Processable Vertical Organic Light-Emitting Transistors (VOLETs) with Directly Deposited Silver Nanowires Intermediate Source Electrode

A simple spin-coating process for fabricating vertical organic light-emitting transistors (VOLETs) is realized by utilizing silver nanowire (AgNW) as a source electrode. The optical, electrical and morphological properties of the AgNW formation was initially optimized, prior VOFET fabrication. A high molecular weight of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] MEH-PPV was used as an organic semiconductor layer in the VOFET in forming a multilayer structure by solution process. It was found that current density and luminance intensity of the VOLET can be modulated by a small magnitude of gate voltage. The modulation process was induced by changing an injection barrier via gate voltage bias. A space-charge-limited current (SCLC) approach in determining transistor mobility has been introduced. This preliminary and fundamental work is beneficial towards all-solution processing display devices.

Download Full-text

High Brightness Organic Light-Emitting Diodes with Capillary-Welded Hybrid Diameter Silver Nanowire/Graphene Layers as Electrodes

Micromachines ◽

10.3390/mi10080517 ◽

2019 ◽

Vol 10 (8) ◽

pp. 517 ◽

Cited By ~ 1

Author(s):

Jianhua Zhang ◽

Yiru Li ◽

Bo Wang ◽

Huaying Hu ◽

Bin Wei ◽

...

Keyword(s):

Indium Tin Oxide ◽

Heat Dissipation ◽

Composite Electrode ◽

Silver Nanowires ◽

Silver Nanowire ◽

Composite Electrodes ◽

Light Emitting ◽

Graphene Layers ◽

Graphene Composite ◽

Organic Light

The development of silver nanowire electrodes is always limited due to some disadvantages, such as roughness, oxidative properties, and other disadvantages. In this research, a capillary-welded silver nanowire/graphene composite film was used as an electrode for organic light-emitting diode (OLED) devices. As an encapsulation layer, graphene reduced the surface roughness and the oxidation probability of silver nanowires. The composite electrode showed an excellent transmittance of 91.5% with low sheet resistant of 26.4 ohm/sq. The devices with the silver nanowire/graphene composite electrode emitted green electroluminescence at 516 nm, and the turn-on voltage was about 3.8 V. The maximum brightness was 50810 cd/cm2, which is higher than the indium tin oxide-based (ITO-based) devices with the same configuration. Finally, it was proved that the silver nanowire/graphene composite electrodes possessed better heat dissipation than the ITO-based ones under energization. In summary, it means that this novel silver nanowires/graphene electrode has great potential in OLED device applications.

Download Full-text

Promising Hybrid Graphene-Silver Nanowire Composite Electrode for Flexible Organic Light-Emitting Diodes

Scientific Reports ◽

10.1038/s41598-019-54424-3 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 4

Author(s):

Huiying Li ◽

Yunfei Liu ◽

Anyang Su ◽

Jintao Wang ◽

Yu Duan

Keyword(s):

Grain Boundaries ◽

Carrier Concentration ◽

Silver Nanowires ◽

Light Emitting Diode ◽

Silver Nanowire ◽

Single Layer Graphene ◽

Transparent Conductive Electrode ◽

Vacancy Defects ◽

Light Emitting ◽

Organic Light

AbstractThanks to its high transparency, high carrier mobility, and thermal conductivity, graphene is often used as transparent conductive electrode (TCE) in optoelectronic devices. However, the low carrier concentration and high resistance caused by vacancy defects, grain boundaries, and superposed folds in typical graphene films limit its application. In this study, we propose a method to increase both the conductivity and carrier concentration in single-layer graphene (SLG) by blending it with silver nanowires (AgNWs). AgNWs provide connections between grain boundaries of graphene to improve charge-carrier transport. The AgNWs in this study can reduce the resistance of SLG from 650 Ω/◻ to 27 Ω/◻ yet still maintain a transmittance of 86.7% (at 550 nm). Flexible organic light-emitting diode, with a maximum 15000 cd m−2 luminance was successfully fabricated using such graphene and AgNWs composite transparent electrodes.

Download Full-text

ITO-Free OLED and OPV Devices with a Transparent Silver Nanowire Electrode

MRS Proceedings ◽

10.1557/opl.2014.674 ◽

2014 ◽

Vol 1699 ◽

Author(s):

Florian Pschenitzka

Keyword(s):

Positive Impact ◽

Silver Nanowires ◽

Silver Nanowire ◽

Optical Performance ◽

Transparent Conductor ◽

Light Emitting ◽

Light Emitting Devices ◽

Transparent Substrate ◽

Organic Light ◽

Liquid Suspension

ABSTRACTCambrios has developed a transparent conductor material based on silver nanowires which can be used to replace the ITO layer in organic photovoltaics (OPV) device and in organic light-emitting devices (OLED).After being deposited from a liquid suspension by conventional coating or printing methods onto a transparent substrate, these nanowires form a transparent conducting network. The sheet resistance of the resulting film is determined by the density of the nanostructures and can thus be easily controlled during the coating process.The elimination of the ITO layer also results in a reduced microcavity effect and thus has a positive impact on the optical performance for OLED lighting devices.This paper will focus on the use of this material as an ITO replacement for OLED devices for lighting applications and for OPV devices. The performance of ITO-free OPV and OLED devices with a nanowire anode will be discussed. We also will present the optical performance data of OLED lighting devices which show the implications of a reduced microcavity effect. In addition, we will show lifetime data for these devices which demonstrate the viability of this technology.

Download Full-text