Author: Lu, Zhen
Title: Intrinsically stretchable, transparent organic light-emitting diode enabled by fully-solution processing
Advisors: Li, Gang (EIE)
Degree: M.Sc.
Year: 2022
Subject: Light emitting diodes
Organic electronics
Hong Kong Polytechnic University -- Dissertations
Department: Department of Electronic and Information Engineering
Pages: iv, 42 pages : color illustrations
Language: English
Abstract: E-skin electronics with softness and stretchability are increasingly required by the next-generation smart electronic microsystems, especially in the emergence of the Internet of Things (IoT). Organic light-emitting diode (OLED) has drawn great attention in lighting, and display due to its lightweight, wide viewing angle, low operating voltage, and flexibility. To achieve a stretchable OLED in the E-skin application, all the functional components are required to be stretchable and transparent. However, the developed OLEDs have suffered the following issues which impede the stretchable applications: First, the widely used transparent bottom electrode such as ITO/PET is too brittle to achieve intensive deformations. Second, the metal electrode on the top of the OLED shows the features of opaque and low stretchability, which is not suitable for stretchable applications. Moreover, the thermally evaporated metal electrodes always require high-vacuum systems, which are expensive and can hardly achieve large-area fabrication. In this case, it is important to explore high-efficient stretchable and transparent electrodes with large-area printing capability for OLED.
In this dissertation, a stretchable OLED device with fully-solution processing without any vacuum system is achieved. First, the replace the ITO bottom electrode, we fabricated bendable and stretchable transparent electrode TPU@AgNWs. Benefiting from the embedded feature, the TPU@AgNWs show a low surface roughness and strong adhesion. The TPU@AgNWs exhibit better optical, electric, and mechanical properties than PET/ITO and PET/PEDOT:PSS. Second, an OLED device based on TPU@AgNWs bottom electrode has been fabricated. This flexible device based on TPU@AgNWs shows good performance with green emission and good flexibility and can tolerate bending deformation. Finally, we achieved a dual-side emissive transparent, stretchable OLED by replacing the top metal electrode with ZAZ, a solution-processed transparent top electrode. The composited ZAZ shows an improved charge injection which leads to a significantly improved performance which is much better than bare AgNWs. The transparent, stretchable OLED shows good performance under tensile strain, which indicates the huge potential in E-skin applications.
Rights: All rights reserved
Access: restricted access

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