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Applied Sciences
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Light Emitting Diode
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Light Emitting Diode

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: closed (10 January 2022) | Viewed by 9841

Special Issue Editor

Prof. Dr. Min-ki Kwon

E-Mail Website
Guest Editor
Department of Photonic Engineering, Chosun University, Gwangju 501-759, Korea
Interests: optoelectronic devices (LED, Solar cell, photoreaction); optical sensor; energy harvesting; 2D/spheres nanomaterials and applications

Special Issue Information

Dear Colleagues,

Dramatic improvements of quantum efficiency of light-emitting diodes can make it possible to expand their applications to versatile fields, such as display, solid-state lighting, and environmental, agricultural, and medical applications. The Special Issue on Light Emitting Diodes will offer an attractive forum to reflect the most recent theoretical and practical developments in the field of light-emitting diodes. The topics of this Special Issue include, but are not limited to, the following: Growth and design, Light emitting device optimization, Fabrication, Performance and reliability,Efficiency droop, Nanostructures and optical devices, Nanowire LEDs, Substrates for light-emitting devices

Phosphors for solid-state lighting, Applications of LEDs, Defects in LEDs, Simulation and optimization of LEDs.

Prof. Dr. Min-ki Kwon
Guest Editor

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. Applied Sciences 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

  • Epitaxy
  • Fabrication
  • Package
  • Quantum efficiency
  • Micro/mini LEDs
  • Application of LEDs

Published Papers (3 papers)

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Research

9 pages, 1975 KiB  
Article
Silver-Nanowire-Based Localized-Surface-Plasmon-Assisted Transparent Conducting Electrode for High-Efficiency Light-Emitting Diode
by Ja-Yeon Kim, Gwang-Geun Oh, Eunjin Kim, Hyeon-Seung Kim, Gwangsik Hong, Jae-Hyun Ryou and Min-Ki Kwon
Appl. Sci. 2021, 11(16), 7747; https://0-doi-org.brum.beds.ac.uk/10.3390/app11167747 - 23 Aug 2021
Cited by 1 | Viewed by 1965
Abstract
Silver nanowire (Ag NWs) networks with high transparency and low resistivity are widely used as promising candidates for the replacement of indium tin oxide (ITO)-based transparent conducting oxides (TCOs) in light-emitting diodes (LEDs). However, LEDs with Ag NW electrodes are less efficient than [...] Read more.
Silver nanowire (Ag NWs) networks with high transparency and low resistivity are widely used as promising candidates for the replacement of indium tin oxide (ITO)-based transparent conducting oxides (TCOs) in light-emitting diodes (LEDs). However, LEDs with Ag NW electrodes are less efficient than those with ITO electrodes because of their low electrical properties, such as high contact resistance and strong absorption in the visible region. In this work, we tried to improve the efficiency of LEDs with transparent conducting electrodes of Ag NWs networks via localized surface plasmons (LSPs) by adopting silver nanoparticles. We studied the effect of the thickness of the p-GaN layer on surface plasmon coupling. When a 45 nm thick p-GaN layer was used, the internal quantum efficiency was improved by LSP coupling between a dipole of QW and Ag NW/NP, and the light extraction was improved because the NPs afforded a leakage mode and acted as scattering centers. Full article
(This article belongs to the Special Issue Light Emitting Diode)
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14 pages, 4294 KiB  
Article
A New Circuit Design of AC/DC Converter for T8 LED Tube
by Sunghwan Kim and Haiyoung Jung
Appl. Sci. 2021, 11(1), 421; https://0-doi-org.brum.beds.ac.uk/10.3390/app11010421 - 04 Jan 2021
Cited by 6 | Viewed by 2590
Abstract
This study is about an improved high-quality light-emitting diode (LED) converter for a T8 LED tube. The converter is separated into the AC driving circuit and DC driving circuit. Also, the LED tube was applied with an output ripple eliminator for the optical [...] Read more.
This study is about an improved high-quality light-emitting diode (LED) converter for a T8 LED tube. The converter is separated into the AC driving circuit and DC driving circuit. Also, the LED tube was applied with an output ripple eliminator for the optical performance. The AC driving circuit and DC driving circuit are assembled at the end of the LED tube in a G13 base and a G13 base dummy, respectively, and the output ripple eliminator is located on an LED PCB. The proposed LED converter is founded on a SSBB (single-stage buck-boost) converter topology and was designed for 10 W operation for a 600 mm T8 LED tube. The light waveform of the LED tube was measured by a photosensor. The waveform had almost no ripple and was the same as a straight line. The average calculated percent flicker of the proposed LED converter was an average of 1.9% at 100 and 240 VAC, 50 and 60 Hz. The proposed converter has lower power efficiency than a conventional converter by 2.7% at 100–240 VAC, but it still has high power efficiency (>87%). The measurement results represent that the LED output current regulation is below 0.92% at 100–240 VAC and the converter obtains the power factor more than 0.84 and the total harmonic distortion is less than 14.3%. All of the current harmonics reach the IEC 61000-3-2 Class D standards for high-quality LED converters. Full article
(This article belongs to the Special Issue Light Emitting Diode)
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17 pages, 5348 KiB  
Article
A Field Study of the Impact of Indoor Lighting on Visual Perception and Cognitive Performance in Classroom
by Qiang Liu, Zheng Huang, Zhijiang Li, Michael R. Pointer, Geng Zhang, Zhen Liu, Hanwen Gong and Zhen Hou
Appl. Sci. 2020, 10(21), 7436; https://0-doi-org.brum.beds.ac.uk/10.3390/app10217436 - 22 Oct 2020
Cited by 16 | Viewed by 4545
Abstract
In this field study, a series of psychophysical tests were conducted to investigate the impact of indoor lighting on students’ visual perception and cognitive performance. A typical classroom of Wuhan University (China) was fitted with tubular light-emitting diode (LED) sources and LED panel [...] Read more.
In this field study, a series of psychophysical tests were conducted to investigate the impact of indoor lighting on students’ visual perception and cognitive performance. A typical classroom of Wuhan University (China) was fitted with tubular light-emitting diode (LED) sources and LED panel sources in two experiments, respectively. Under the two lighting environments, seventy-nine college students were invited to complete a group of visual tests, which included colour preference evaluations of fruit and vegetables and skin tone, perceptual judgement on the atmosphere of the lighting environment, a reading comfort assessment concerning different paper colours, a Karolinska Sleepiness Scale (KSS) test quantifying alertness, and the Anfimov test of attention (also concerning paper colours). These tests were conducted twice, before and after a two-hour self-study under each lighting environment, with the aim of investigating the impact of visual fatigue on visual perception and cognitive performance. It was found that the influence of indoor lighting was significant on skin preference and atmosphere perception, while no measured effects of lighting were observed on participant’s alertness and attention. Meanwhile, the impact of visual fatigue was also found to be insignificant in this case. Interestingly, paper colour, rather than indoor lighting, was found to have a significant impact on the visual comfort of text reading. In addition, degree of proficiency significantly influenced the proofreading speed and accuracy of the subjects the in Anfimov test, which we believe should be taken into consideration when implementing similar tests in follow-up studies. The preliminary findings of this field study should provide a deeper understanding of how changes in classroom lighting contribute to visual perception and cognitive performance of occupants. Full article
(This article belongs to the Special Issue Light Emitting Diode)
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