P‐175: Direct Electron Beam Micropatterning and Thermal Annealing of Organic Light Emitting Devices

Bodenstein, Elisabeth; Saager, Stefan; Metzner, Mario; Hoffmann, M.; Hild, Olaf R.; Metzner, Christoph; Vogel, Uwe

doi:10.1002/sdtp.12009

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…To form a micropattern directly onto the polymer devices after completing the entire fabrication process, we employed a heat-induced modification method used for organic materials. Recently, an approach for the local modification of emissive regions in OLEDs was suggested; , however, that process involved a focused electron beam, which requires high vacuum conditions, and therefore, the process has a limited throughput. In this work, we utilized laser irradiation as the remote source of energy to make micropatterns in polymer semiconductors because it is suitable for low-cost fabrication with high throughput at an ambient atmospheric pressure.…”

Section: Resultsmentioning

confidence: 99%

“…The separation in the supply chain can make the manufacturing cost of final products more cost-effective. However, the e-beam process also requires high vacuum ambient, and thus, the potential for a scale-up and low-cost production is rather limited. , …”

Section: Introductionmentioning

confidence: 99%

“…19 Very recently, Bodenstein et al demonstrated a highresolution patterning of 2 μm pixels on conventional small molecular OLEDs using an electron beam (e-beam) process. 20,21 Their results can be regarded as a step forward to fabricate an organic device because the modification of the emissive active region can be performed after a complete device fabrication, including encapsulation. The direct modification of emitting areas can be made with great flexibility even after entire OLED fabrication processes as per each end user's request.…”

Section: Introductionmentioning

confidence: 99%

“…However, the e-beam process also requires high vacuum ambient, and thus, the potential for a scale-up and low-cost production is rather limited. 20,21 Hence, we here propose a novel laser micropatterning technique for polymer optoelectronic devices that is highly scalable and cost-effective. When a nanosecond pulse laser was irradiated onto "ready-made" polymer devices, the high power pulse altered morphological structures of the polymer active layers; thus, as a result, the irradiated regions were contrasted against the nonirradiated regions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Laser-Induced Direct Micropatterning on Polymer Optoelectronic Devices

Yun

Han

Kang

et al. 2019

ACS Appl. Mater. Interfaces

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Solution-processed polymer devices have been studied as a low-cost alternative to the conventional vacuum-processed organic devices. However, forming a specific pattern on polymer semiconductor films without costly lithography is still challenging. Herein, we report a low-cost direct patterning method for polymer optoelectronic devices, which can successfully engrave designated patterns on the polymer semiconductor layer regardless of its size and even after device encapsulation. Irradiation of a 100 ns pulse laser forms high-resolution patterns on devices such as polymer light-emitting diodes and polymer memory devices. The biggest advantage of the proposed patterning method is that it does not produce any physical damage in the device, such as leakage current or degraded light-emitting efficiency. Analysis confirms that the laser-induced heat alters the solid or crystal structure of the polymer semiconducting layers so that the designated areas of the polymer devices can be selectively and deliberately deactivated. We demonstrate the usability of the developed laser-induced direct-patterning method on the polymer devices by engraving a digital image onto “ON-state” light-emitting devices and by generating multiple states onto a 4 × 4 matrix polymer nonvolatile memory.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Laser-Induced Direct Micropatterning on Polymer Optoelectronic Devices

Yun

Han

Kang

et al. 2019

ACS Appl. Mater. Interfaces

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“…8). In a first proof of concept green and blue colored diodes could be successfully demonstrated by using this electron beam ablation process [9].…”

Section: Oled Micro-patterningmentioning

confidence: 99%

OLED microdisplays in near-to-eye applications: challenges and solutions

et al. 2017

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Wearable augmented-reality (AR) has already started to be used productively mainly in manufacturing industry and logistics. Next step will be to move wearable AR from "professionals to citizens" by enabling networked, everywhere augmented-reality (in-/outdoor localisation, scene recognition, cloud access,…) which is non-intrusive, exhibits intuitive user-interaction, anytime safe and secure use, and considers personal privacy protection (user's and others). Various hardware improvements (e.g., low-power, seamless interactivity, small form factor, ergonomics,…), as well as connectivity and network integration will become vital for consumer adoption.Smart-Glasses (i.e., near-to-eye (NTE) displays) have evolved as major devices for wearable AR, that hold potential to become adopted by consumers soon. Tiny microdisplays are a key component of smart-glasses, e.g., creating images from organic light emitting diodes (OLED), that have become popular in mobile phone displays. All microdisplay technologies on the market comprise an image-creating pixel modulation, but only the emissive ones (for example, OLED and LED) feature the image and light source in a single device, and therefore do not require an external light source. This minimizes system size and power consumption, while providing exceptional contrast and color space.These advantages make OLED microdisplays a perfect fit for near-eye applications. Low-power active-matrix circuitry CMOS backplane architecture, embedded sensors, emission spectra outside the visible and high-resolution sub-pixel micro-patterning address some of the application challenges (e.g., long battery life, sun-light readability, user interaction modes) and enable advanced features for OLED microdisplays in near-to-eye displays, e.g., upcoming connected augmented-reality smart glasses. This report is to analyze the challenges in addressing those features and discuss solutions.

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P‐175: Direct Electron Beam Micropatterning and Thermal Annealing of Organic Light Emitting Devices

Cited by 2 publications

References 5 publications

Effect of Laser-Induced Direct Micropatterning on Polymer Optoelectronic Devices

Effect of Laser-Induced Direct Micropatterning on Polymer Optoelectronic Devices

OLED microdisplays in near-to-eye applications: challenges and solutions

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