Folding-stability criteria of thin-film encapsulation layers for foldable organic light-emitting diodes

Park, Yoon-Taik; Kim, Sang Woo; Ham, Soung Bo; Cho, Sung Min

doi:10.1016/j.tsf.2020.138277

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…However, our oriented films showed no degradation in fluorescence polarization and maintained consistent orientation factors. A method for preparing the oriented films of conjugated polymers with high folding stability of fluorescence polarization will be useful for the development of flexible OLEDs − and flexible polarized OLEDs …”

Section: Results and Discussionmentioning

confidence: 99%

Cellulose-Templated Stable Foldable Oriented Films with Polarized RGB Luminescence

et al. 2022

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Solution processing in a vacuum-free system is highly advantageous because printing, coating, and roll-to-roll processes can be used for large-area and scalable manufacturing. However, producing a flat surface with high orientation is challenging. In addition, high folding stability is essential for building a basis for foldable devices. Herein, we present a valuable method to obtain oriented films of π-conjugated polymers, which we describe as a "Simple way of Orienting Films prepared by Templating cellulose," abbreviated as SOFT. In this method, a glass or flexible substrate was uniaxially coated by a single-sweep process using a wet cloth containing a cellulose solution. A conjugated polymer solution, an OLED material, was deposited onto the cellulose film by spin coating, followed by thermal annealing. A uniaxially oriented film was obtained with orientation factors up to 0.9, and its polarized fluorescence was verified for red/green/blue colors. The oriented films were stable at various positions and showed no degradation of orientation factors after folding 100−500 times at a folding angle of 320°. The homogeneous area and surface roughness of the films were approximately 2 × 3 cm 2 and 50 nm, respectively, with an orientation reproducibility of ∼96%. A high tensile strength of 30 MPa was measured on the oriented films. The orientation mechanism was attributed to the alignment of the backbone structure of the conjugated polymers along the surface anisotropy of a uniaxially coated cellulose film.

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Section: Results and Discussionmentioning

confidence: 99%

Cellulose-Templated Stable Foldable Oriented Films with Polarized RGB Luminescence

et al. 2022

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“…10 To avoid this problem, optically clear adhesive (OCA) with minimized outgassing during the curing process is used widely in the production of OLED-based display products. 16 Template for Organic Materials Thieme However, the thickness of OCA is usually in the order of a few tens of micron, which is quite thick for the applications requiring high-resolution displays or micro-display, which are often suffering from the light leakage from the side edge of each pixels. 17 Therefore, it is necessary to scale down the thickness of the laminating adhesive layer without compromising the adhesion strength and the damage-free nature of the curing process.…”

Section: Introductionmentioning

confidence: 99%

A Low-Temperature Curable Conformal Adhesive Layer for Monolithic Lamination of Thin Film Encapsulation

et al. 2023

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Lamination of thin film encapsulation (TFE) layer is regarded as one of the most promising methods that enables the reliable operation of organic electronic devices by attaching the TFE layers thereon directly using an adhesive layer. In this study, a low-temperature curable adhesive thin film with low glass transition temperature (Tg) is newly designed and synthesized. Low Tg allows conformal contact at the interface of the adhesive layer and the substrate subsequently leads to the enhancement of adhesion, and thus the barrier performance of the lamination of barrier film. In order to fabricate a low-Tg adhesive layer, glycidyl methacrylate (GMA) was copolymerized with 2-hydroxyethyl acrylate (HEA) monomer in vapor phase via initiated chemical vapor deposition. With a 5 μm-thick p(GMA-co-HEA) adhesive layer, a strong adhesion was readily achieved by curing it at 60 ℃ for 1 hr, with the peel strength of 16.6 N/25 mm, and the water vapor transmission rate (WVTR) of glass laminated encapsulation was as low as 3.4×10-3 g/m2∙day at an accelerating condition (38 ℃, 90% relative humidity). We believe the low-temperature curable thin adhesive layer will serve as a powerful material for the lamination of organic electronic devices in damage-free way.

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The estimation of crack onset strain for brittle films with residual stress on ductile substrates

Wu,

Zhang,

Wang

et al. 2023

Engineering Fracture Mechanics

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Folding-stability criteria of thin-film encapsulation layers for foldable organic light-emitting diodes

Cited by 5 publications

References 18 publications

Cellulose-Templated Stable Foldable Oriented Films with Polarized RGB Luminescence

Cellulose-Templated Stable Foldable Oriented Films with Polarized RGB Luminescence

A Low-Temperature Curable Conformal Adhesive Layer for Monolithic Lamination of Thin Film Encapsulation

The estimation of crack onset strain for brittle films with residual stress on ductile substrates

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