Conductor grid optimization for luminance loss reduction in organic light emitting diodes

Neyts, Kristiaan; Real, Alfonso; Marescaux, Matthias; Mladenovski, Saso; Beeckman, Jeroen

doi:10.1063/1.2907960

Cited by 46 publications

(39 citation statements)

References 5 publications

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“…[ 29 ] A video showing an excerpt of the printing of a t-hex TCE grid including the above-mentioned optimized velocity profi les is shown in Video S1 (Supporting Information).…”

Section: T R φ =mentioning

confidence: 99%

Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

Schneider

Rohner

Thureja

et al. 2015

Adv Funct Materials

240

255

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833wileyonlinelibrary.com fi lm solar cells, and smart windows. [ 4 ] The main disadvantage of ITO is its limited optical performance at very low sheet resistances. Moreover, the brittleness of the ceramic ITO fi lms can present a bottleneck in the fabrication of highly fl exible devices. [ 5 ] These disadvantages have motivated recent research efforts toward alternative material systems such as carbon nanotube [ 6 ] or silver nanowire (AgNW) networks, [ 7,8 ] metallized electrospun nanowires, [ 9,10 ] graphene layers, [ 11 ] ultrathin metal fi lms, [ 12 ] self-forming [ 13 ] or patterned metal grids. [14][15][16][17][18][19][20] Ideally, besides having very good electrical and optical performance, the new system should be low cost, fl exible and include direct patterning. The former two can be achieved by the additive solution-processing of silver nanowire networks that show remarkable fl exibility. [ 8 ] Depending on the application, this method however requires a post deposition structuring step. Direct patterning can be implemented with metal-wire grid electrodes when considering suitable printing technologies. While grids have been realized with nanoscale lines in several studies, the fabrication relied on subtractive multistep patterning methods such as imprinting, [ 14,15,20 ] lithography, [ 15 ] or evaporative self-assembly. [ 16 ] For microscale line widths, although not completely additive, an elegant method using selective laser sintering of a silver or nickel nanoparticle fi lm has been presented by Hong et al. [ 17 ] and Lee et al., [ 18 ] respectively. A direct ink writing approach of concentrated silver inks has been shown by Ahn et al., demonstrating linewidths around 5 µm. [ 19 ] TCE of very high performance have been demonstrated by electrospinning of polymer nanowires followed by the metal evaporation resulting in nanotrough networks of various metals. [ 9 ] A similar procedure was used to fabricate a network of copper wires about 1 µm in diameter that can be transferred onto a fi ner mesh of solution-deposited nanowires. [ 10 ] However, this interesting method is neither additive nor does it have the ability for direct patterning.Electrohydrodynamic (EHD) printing, the technique used in this work, has been applied as a viable additive and noncontact printing technique. Conventional additive printing methods such as screen printing or inkjet printing simply lack the resolution needed for invisible metal grid TCE applications. Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

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“…[ 29 ] A video showing an excerpt of the printing of a t-hex TCE grid including the above-mentioned optimized velocity profi les is shown in Video S1 (Supporting Information).…”

Section: T R φ =mentioning

confidence: 99%

Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

Schneider

Rohner

Thureja

et al. 2015

Adv Funct Materials

240

255

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“…According to Neyts et al [9], the current density pointing out to the anode plane in a stationary situation is 1 Rðx; yÞ…”

Section: Voltage Distribution In a Bottom Emitting Oledmentioning

confidence: 99%

“…2). Hexagon and square grid geometries create good voltage homogeneity at a transparent anode [9,5], and the line group design is the most suitable for Joule heating. The current model gives no information about the curing locality, but it describes how the current flows in a grid system.…”

Section: Current Modelmentioning

confidence: 99%

Optimization of large-area OLED current distribution grids with self-aligned passivation

Janka

Saukko

Raumonen

et al. 2014

Organic Electronics

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“…For the ETL (electron transfer layer) and EIL (electron injection layer), we used the general material and thickness, which were Alq3@100Å and LiF@20Å. The entire device structure is as follows (Figure 1 to reduce the non-uniformity of the WOLED panel, such as using a tandem structure that can reduce the resistance of the OLED device and improve the uniformity of the WOLED panel [13], and using a different type of grid design by, say, improving the shape, width, and length of the metal mesh to improve the uniformity and emitting area of the WOLED panel [14]. The improvement of the metal mesh design can achieve good uniformity, but the OLED is a current driving device, and the metal mesh is always resistant, so the metal mesh in the emitting area of the WOLED panel always has non-negligent power dissipation and leads to reliability problems, such as the short between anode and cathode [15], and the thermal problems of the organic materials [16].…”

Section: Device Structurementioning

confidence: 99%

“…The emitting area, which is far away from the electrode of the panel, is much dimmer than the emitting area near the electrode [12]. People have developed many methods to reduce the non-uniformity of the WOLED panel, such as using a tandem structure that can reduce the resistance of the OLED device and improve the uniformity of the WOLED panel [13], and using a different type of grid design by, say, improving the shape, width, and length of the metal mesh to improve the uniformity and emitting area of the WOLED panel [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Lighting OLED Panel Design

2016

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A novel OLED (organic light emitting diode) lighting panel, which uses a special layout design, can reduce the photolithography cycles and process costs and is more reliable. It only needs two steps of photolithography cycles, which include an ITO (InSnO compound transparent oxide) pattern and insulator pattern. There is no need for the metal bus pattern of the ordinary design. The OLED device structure is a type of red-green-blue (RGB)-stacked emitting layer that has a good color index and greater adjustability, which improves the performance of the device. This novel design has the same equipment and material requirement compared to the ordinary design, and it is very beneficial in terms of high volume and low-cost production. It uses a hyper driving method because the entire OLED lighting panel is divided into many sub-emitting units; if one of the sub-emitting units is burned out, it has no effect on the adjacent sub-emitting unit, so the reliability is markedly better than the ordinary design.

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Conductor grid optimization for luminance loss reduction in organic light emitting diodes

Cited by 46 publications

References 5 publications

Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

Optimization of large-area OLED current distribution grids with self-aligned passivation

A Novel Lighting OLED Panel Design

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