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Electronics
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Flexible Devices and Optoelectronics Technologies
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Flexible Devices and Optoelectronics Technologies

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Flexible Electronics".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 4090

Special Issue Editors

Prof. Dr. Jiaqing Xiong

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Guest Editor
Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, China
Interests: smart textiles; wearable devices; soft electronics; nanogenerators; self-powered systems; intelligent biointerfaces
Prof. Dr. Jiangxin Wang

E-Mail Website
Guest Editor
School of Mechanical Engineering, Sichuan University, Chengdu 610017, China
Interests: soft electronics; wearable devices; sensors; electroluminescent devices; actuators; soft robotics
Prof. Dr. Haizeng Li

E-Mail Website
Guest Editor
Institute of Frontier and Interdisciplinary Science, School of Energy and Power Engineering, Shandong University, Qingdao 266237, China
Interests: electrochromic devices; wearable electronics; energy storage; radiative heat transfer

Special Issue Information

Dear Colleagues,

Realizing materials innovations for function integration of flexible devices and optoelectronic technologies remains a challenge in the next generation of soft implements, which are highly desirable for wearable applications, health monitoring coupled with intelligent life, and smart dimmers as well as light controls. Flexible devices and optoelectronic technologies widely comprise the application of functional materials in terms of mechanics, photology, electricity, and thermology, such as the devices of energy harvesters, sensors, actuators, field-effect transistors, memory devices, batteries, smart windows, light-emitting devices, touch panels, and displays. A variety and soft forms of these devices are naturally emerging, with their extraordinary capabilities endowed by ingenuity in materials, designs, system integration, and smart control. The evolution of flexible devices and optoelectronic technologies aims to build intelligent interfaces between humankind and the environment, which will be capable of achieving enhancement of the perception of people, physiological monitoring, environment regulation, augmented reality, as well as imperceptible camouflage. In this Special Issue, we invite research perspectives which include articles and reviews to address various important topics, aiming to highlight the pivotal roles played by materials innovations and device integration. These will continue to be important in steering the field of flexible devices and optoelectronic technologies to a greater height. We look forward to your contributions to this Special Issue and are most grateful for the invaluable support and professional editing from the whole editorial team of Electronics.

Prof. Dr. Jiaqing Xiong
Prof. Dr. Jiangxin Wang
Prof. Dr. Haizeng Li
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • flexible and stretchable devices
  • optoelectronic devices
  • wearable technologies
  • soft robotics
  • sensors
  • actuators
  • nanogenerators
  • electroluminescence
  • electrochromics
  • thermal management

Published Papers (2 papers)

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Research

13 pages, 4287 KiB  
Article
Inhibiting Oil Splitting and Backflow in Electrowetting Displays by Designing a Power Function Driving Waveform
by Lixia Tian, Hu Zhang, Zichuan Yi, Bingsong Zhang, Rui Zhou, Guofu Zhou and Jianlong Gong
Electronics 2022, 11(13), 2081; https://doi.org/10.3390/electronics11132081 - 02 Jul 2022
Cited by 4 | Viewed by 1371
Abstract
Electrowetting display (EWD) is one of the latest and most promising reflective displays. However, some defects are easily caused in a driving process. For example, the aperture ratio of pixels can be reduced due to oil splitting, and the grayscale cannot be stabilized [...] Read more.
Electrowetting display (EWD) is one of the latest and most promising reflective displays. However, some defects are easily caused in a driving process. For example, the aperture ratio of pixels can be reduced due to oil splitting, and the grayscale cannot be stabilized due to charge trapping. These defects can be effectively solved by designing driving waveforms for EWDs. So, a power function driving waveform was proposed in this paper, which consisted of an oil splitting suppression stage, a direct current (DC) driving stage and an oil stabilization stage. Firstly, the relationships among luminance values, power constants and driving time were measured. An optimal oil splitting suppression stage was obtained, which could effectively inhibit oil splitting. Then, the response time could be reduced by a DC voltage in the DC driving stage. Finally, a voltage slope was tested during the oil stabilization stage, which was used to counteract voltage created by the charge trapping. The experimental results showed that compared with a linear function waveform, the response time could be shortened by 16.1%, and the luminance value could be increased by 3.8%. The aperture ratio and oil stability of EWD can be effectively improved by these findings, thereby increasing its potential application in the display field. Full article
(This article belongs to the Special Issue Flexible Devices and Optoelectronics Technologies)
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12 pages, 2184 KiB  
Article
Controllable and Scalable Fabrication of Superhydrophobic Hierarchical Structures for Water Energy Harvesting
by Meiling Guo, Cheng Wang, Zhenchao Yang, Zhentao Xu, Mingshun Yang, Pengkang Zhao, Yan Zhou, Pengyang Li, Quandai Wang and Yan Li
Electronics 2022, 11(10), 1651; https://doi.org/10.3390/electronics11101651 - 22 May 2022
Cited by 12 | Viewed by 1781
Abstract
We report a controllable and scalable fabrication approach for the superhydrophobic hierarchical structures and demonstrate the excellent ability to harvest water energy when applied to water-solid contact triboelectric nanogenerator (TENG). A strategy combined with multiple photolithography and micromolding process was developed to accurately [...] Read more.
We report a controllable and scalable fabrication approach for the superhydrophobic hierarchical structures and demonstrate the excellent ability to harvest water energy when applied to water-solid contact triboelectric nanogenerator (TENG). A strategy combined with multiple photolithography and micromolding process was developed to accurately regulate the diameters and the center distances of the two-level micropillars. A variety of hierarchical structures were successfully fabricated and presented the advantages of structure control, large scale, high accuracy, and high consistency. The hydrophobic property characterizations were conducted, and the results indicated that the hierarchical structures showed a larger contact angle than the single-level structures and achieved superhydrophobicity. Then the hierarchical structures were applied to water-TENGs with flowing water continuously dripping on, and the effect of the structure parameter on the triboelectric output was analyzed. The hierarchical structures exhibited a superior ability to harvest water energy than the flat film and the single-level structures due to the enhanced friction area and superhydrophobic property. At a flowing velocity of 8 mL/s, the hierarchical structure generated the output voltage of approximately 34 V and the short-circuit current of around 5 μA. The water-TENG device exhibited a power density peak of 7.56 μW/cm2 with a resistive load of 16.6 MΩ at a flowing velocity of 10 mL/s. These findings shed light on the potential applications of the hierarchical structures-based water-TENGs to water energy harvesting and self-powered sensor devices. Full article
(This article belongs to the Special Issue Flexible Devices and Optoelectronics Technologies)
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