White Organic Electroluminescent Devices Fabricated Using Ink-Jet Printing Method

Satoh, Ryu−ichi; Naka, Shigeki; Miki, Satoshi; Okada, Hiroyuki; Onnagawa, Hiroyoshi; Miyabayashi, Takeshi

doi:10.1143/jjap.43.7395

Cited by 15 publications

(12 citation statements)

References 12 publications

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“…These device characteristics are much better than those of the spin-coated reference OLEDs, exhibiting maximum brightness of %1,800 cd m À2 and a peak efficiency of %4.4 cd A À1 (Figure S4, Supporting Information). Moreover, the device characteristics of the singleinkjet-printed μ-OLED arrays exceed those of previous inkjetprinted devices fabricated using the intrinsically phase-inseparable polymer PMMA, [44] as expected. It is also noteworthy that the green μ-OLED array studied here showed much higher brightness levels even with comparable peak efficiency values as compared with those of conventional well-optimized inkjet-printed OLED devices with additional hole-blocking and electron-transport layers.…”

Section: Device Performance Of μ-Oleds With Inkjet-inlaid Eml Spotssupporting

confidence: 68%

“…Moreover, it is important to note that the structural characteristics of the microinlay spot in the phase-separable P4VP layer are quite different from those of previous inkjet-printed spots on PMMA layers. [44] For the PMMA insulating layer, a confocal Raman study shows that a large amount of the PMMA polymer still remains inside the inkjet-printed spot, forming a blended mixture with CBP (Figure S2, Supporting Information), in contrast to the microinlay structure studied here, as mentioned earlier.…”

Section: Confocal Raman Spectra Of a Single-inkjet-printed Cbp Spot I...supporting

confidence: 60%

“…As a preliminary example, a simple maskless inkjet‐patterned OLED that included a thin insulating layer of poly(methyl methacrylate) (PMMA) was suggested. [ 44 ] Despite its simple fabrication process, it was ineffective; due to the PMMA polymer remaining inside the inkjet‐printed spots of the light‐emitting functional materials, the inkjet‐printed OLED based on PMMA exhibited relatively poor device performance. The PMMA‐based inkjet technology thus remains associated with difficulties in regard to improving the low quality and/or low purity levels of functional materials in printed spots.…”

Section: Introductionmentioning

confidence: 99%

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Light‐Emitting Microinlaid Spots Produced through Lateral Phase Separation by Means of Simple Single‐Inkjet Printing

Park

Kim

et al. 2022

Small Science

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High‐performance solution‐processable light‐emitting diodes (LEDs) attract much research interest due to the very high complexity of conventional vacuum‐processed LEDs. A simple single‐inkjet‐printing process using a phase‐separable material combination is presented. With single‐inkjet printing of an ink containing semiconducting compounds on a phase‐separable insulating layer, convective and Marangoni flows in sessile droplets can produce microinlaid spots through the site‐selective etching of the insulating layer and the simultaneous self‐filling of the semiconductors in the etched vacancies. As a proof of concept, microinlaid organic LEDs (OLEDs) with a spatial resolution of ≈200 dpi in a phase‐separable poly(4‐vinylpyridine) layer without any conventional preformation of bank‐like structures are produced. The fabricated green microinlaid OLEDs exhibit excellent performance with maximum brightness of ≈13 000 cd m−2 and maximum efficiency of ≈14.2 cd A−1. Moreover, large‐area inkjet‐printed OLEDs are simply realized using the microinlaid spot arrays. These results demonstrate that the inkjet‐inlay structure is a promising candidate for high‐performance next‐generation solution‐processable LEDs.

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Section: Device Performance Of μ-Oleds With Inkjet-inlaid Eml Spotssupporting

confidence: 68%

Section: Confocal Raman Spectra Of a Single-inkjet-printed Cbp Spot I...supporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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Light‐Emitting Microinlaid Spots Produced through Lateral Phase Separation by Means of Simple Single‐Inkjet Printing

Park

Kim

et al. 2022

Small Science

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“…Through sequestering emissive species in colloidal particles, the ability to inhibit fluorescent resonance energy transfer (FRET) between emissive species enables the device engineer to create single-layer OLED devices that emit light in wavelengths across the visible spectrum for a variety of applications . These mixed colloidal dispersions can then be used in spin-cast device architecture or formed into inks suitable for a variety of conventional printing processes, such as inkjet, − roll to roll, , screen, and spray printing techniques.…”

Section: Introductionmentioning

confidence: 99%

Spectral Tuning of Conjugated Polymer Colloid Light-Emitting Diodes

Huebner

Foulger

2009

Langmuir

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In recent years, the importance of the polymer light-emitting diode (PLED) has grown immensely, proving very desirable in numerous applications because of very high efficiencies, low power consumption, and ease of fabrication. Typically, these devices have been constructed in a layered, thin-film fashion consisting of either electron- and hole-transport materials doped with a luminescent dye (Hebner, T. R.; Sturm, J. C. Appl. Phys. Lett. 1998, 73, 1775. Jiang, X.; Register, R. A.; Killeen, K. A.; Thompson, M. E.; Pschenitzka, F.; Hebner, T. R.; Sturm, J. C. J. Appl. Phys. 2002, 91, 6717. Yeh, K. M.; Chen, Y. Org. Electron. 2008, 9, 45-50. Oh, G. C.; Yun, J. J.; Park, S. M.; Son, S. H.; Han, E. M.; Gu, H. B.; Jin, S. H.; Yoon, Y. S. Mol. Cryst. Liq. Cryst. 2003, 405, 43-51. Lee, J. I.; Chu, H. Y.; Kim, S. H.; Do, L. M.; Zyung, T.; Hwang, D. H. Opt. Mater. 2003, 21, 205-210. Hwang, D.-H.; Park, M.-J.; Lee, C. Synth. Met. 2005, 152, 205-208) or a conjugated polymer that can be engineered to tune the emission of the PLED to particular wavelengths. Stable PLED aqueous colloidal dispersions were prepared containing poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene], (MEH-PPV), poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO), and a binary poly(9,9-di-n-octylfluorenyl-2,7-diyl)/poly(2,5-dioctyl-1,4-phenylenevinylene) (PFO/POPPV) particle dispersion. Red-, green-, and blue-light-emitting colloidal dispersions could then be combined to achieve color-tailored emissions spanning the visible spectrum.

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“…To fabricate WOLEDs based on small molecules, a general approach is sequentially to evaporate multiple layers with a specific emission color for each layer [4,5] or simultaneously to evaporate multi-materials in one layer [10] in a high vacuum, which is a quite complicated technique to realize white light. The WOLED based on light emitting polymer (WPLED), however, often consist of a single active layer easily made by wet processes, including spin-casting, screen printing or ink-jet printing techniques [6,11,[15][16][17], which are expected to reduce the cost in mass production, especially in the production of large-area panel displays and light source.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of White Polymer Light Emitting Diode with Single Emitting Layer Using Blends of Polyfluorene Based Polymers

Lee

Shin

et al. 2013

Molecular Crystals and Liquid Crystals

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We synthesized one blue emitting polymer (P1) and two green emitting polymers (P2, P3) based on polyfluorene with wide photoluminescence spectra, and fabricated white polymer light emitting diodes (W1, W2) with single emitting layer through a blend method. The weight ratio of P1 and P2 or P3 was adjusted to achieve white light emission and to balance the light color. In this study, we achieved (575 cd/m 2 , 0.68 cd/A) with bluish white emission using W1 (P1 : P2 = 98.0 : 2.0), and (554 cd/m 2 , 0.8 cd/A) using W2 (P1 : P3 = 98.0 : 2.0) with greenish white emission. Luminance of devices, which had the donor concentration above 2.0 wt%, decreased on account of high concentration quenching.

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White Organic Electroluminescent Devices Fabricated Using Ink-Jet Printing Method

Cited by 15 publications

References 12 publications

Light‐Emitting Microinlaid Spots Produced through Lateral Phase Separation by Means of Simple Single‐Inkjet Printing

Light‐Emitting Microinlaid Spots Produced through Lateral Phase Separation by Means of Simple Single‐Inkjet Printing

Spectral Tuning of Conjugated Polymer Colloid Light-Emitting Diodes

Fabrication of White Polymer Light Emitting Diode with Single Emitting Layer Using Blends of Polyfluorene Based Polymers

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