Polyimide Coatings for OLED Applications

Okuda, Ryoji; Miyoshi, Kazuto; Arai, Nana; Tomikawa, Masao

doi:10.2494/photopolymer.17.207

Cited by 26 publications

(10 citation statements)

References 4 publications

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“…For these reasons, PIs are one of the most prominent candidates in the field of electronics for a flexible substrate as an insulation layer. But there are some drawbacks such as a mismatch of coefficient of thermal expansion (CTE) between layers that gives rise to strain and crack under thermal cycling during device fabrication …”

Section: Introductionmentioning

confidence: 98%

Enhanced interaction in the polyimide/sepiolite hybrid films via acid activating and polydopamine coating of sepiolite

Kim

Choi

Jeong

et al. 2018

Polymers for Advanced Techs

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We aimed at enhancing interaction in the polyimide/sepiolite hybrid films with the loading of sepiolite in the polyimide matrix ranged from 0 to 8 wt% via acid activating and polydopamine doping. First, sepiolite was treated with a 3M HCl solution under reflux conditions. Then the acid-activated sepiolite was coated by mussel-inspired polydopamine under alkaline conditions.The coated polydopamine was found to successfully enhance dispersibility of sepiolite in the polyimide matrix. The modification of the sepiolite in the hybrid films was investigated by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, field emission scanning electron microscopy, thermogravimetric analysis, and transmission electron microscope. The results indicated that polydopamine coating could increase interaction between the polyimide matrix and sepiolite. KEYWORDS acid activation, polydopamine, polymer/clay nanocomposite, pyromellitic dianhydride-4,4′oxydianiline polyimide, sepiolite

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Section: Introductionmentioning

confidence: 98%

Enhanced interaction in the polyimide/sepiolite hybrid films via acid activating and polydopamine coating of sepiolite

Kim

Choi

Jeong

et al. 2018

Polymers for Advanced Techs

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“…In order to explore the adhesion properties of the OLEDs, the widely used peel test was employed as shown in Fig. 1(b) 1 , 13 , 24 – 26 . The peel test is a well-known technique for measuring macroscopically the adhesion properties of materials through the analysis of the maximum load because this maximum load is defined as the force measured when the layers completely detached from the fixed OLED.…”

Section: Resultsmentioning

confidence: 99%

“…Since their invention, organic light-emitting diodes (OLEDs) have been studied extensively because of their low power consumption, high brightness, and improved contrast ratio in numerous display applications such as televisions and cellular phones 1 – 4 . An OLED differs from a conventional liquid crystal display in various ways, including in its structure and the components used 5 , 6 .…”

Section: Introductionmentioning

confidence: 99%

Origin of macroscopic adhesion in organic light-emitting diodes analyzed at different length scales

Kim

Park

Lee

et al. 2018

Sci Rep

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Organic light-emitting diodes (OLEDs) have been widely studied because of their various advantages. OLEDs are multi-layered structures consisting of organic and inorganic materials arranged in a heterojunction; the nature of adhesion at their heterogeneous interfaces has a significant effect on their properties. In this study, the origin of macroscopic adhesion was explored in OLEDs using a combination of microscopy techniques applied at different length scales. The different techniques allowed the identification of layers exposed by a peel test, which aided direct characterization of their macroscopic adhesion. Further, the contribution of each exposed layer to macroscopic adhesion could be determined through an analysis of photographic images. Finally, analysis of the local roughness and adhesion confirmed that the interface between an anode and emission layer could play a predominant role in determining the nature of macroscopic adhesion in OLEDs. These results may provide guidelines for exploring the origin of macroscopic adhesion properties through a combination of various microscopy techniques.

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“…In addition, he and his group modified that the positive photo definable polyimide for the pixel divided layer of OLED displays.to improve long term reliability of OLED displays by minimizing the out-gassing and pixel shrinkage study with development of the slit-die coating process [13].…”

Section: Masao Tomikawamentioning

confidence: 99%

The Photopolymer Science and Technology Award

Tomikawa

2020

J. Photopol. Sci. Technol.

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The Photopolymer Science and Technology Award No. 201100, the Outstanding Achievement Award 2020 was presented to Dr. Masao Tomikawa for his outstanding achievements in photo definable polyimides science and technology including the photo reaction mechanism of the Ionic-bonded-photosensitive polyimide, and the pioneering development of positive photo definable polyimide by partial esterification of poly(amic acid) for semiconductor stress buffer and for the organic light emitting diode (OLED) displays. In addition, he contributed the Cu compatibility study for the improvement to long time reliability of the polyimide and Cu interconnection.

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Polyimide Coatings for OLED Applications

Cited by 26 publications

References 4 publications

Enhanced interaction in the polyimide/sepiolite hybrid films via acid activating and polydopamine coating of sepiolite

Enhanced interaction in the polyimide/sepiolite hybrid films via acid activating and polydopamine coating of sepiolite

Origin of macroscopic adhesion in organic light-emitting diodes analyzed at different length scales

The Photopolymer Science and Technology Award

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