Ultraviolet Devices and Ultraviolet Germicidal Irradiation
A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".
Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 1100
Special Issue Editor
Interests: epitaxial growth of environmentally safe semiconducting materials for solar cells (group II–IV materials, BaSi2-based heterojunction solar cells); III–V materials and nano-scale materials, i.e., silicon nanowire (Si–NWs), indium nano-particles (In NPs) and quantum dots (QDs) for efficient photovoltaic devices (solar cells) and nanotechnology application; III-nitride-based (AlGaN) (220–340 nm) band ultraviolet light-emitting diodes (UV LEDs) and UV laser diodes (UV LDs); new far-UVC class metal organic frameworks
Special Issue Information
Dear Colleagues,
In the last two decades, clean and safe wide-bandgap nitride materials have reached an outstanding stage of development, now representing the second largest semiconductor market after silicon. In particular, GaN-based blue light-emitting diodes (LEDs) are now widely used in a broad range of applications (e.g., domestic lighting, backlit smartphones, liquid crystal display screens, etc.). To further increase the application potential of nitride LEDs, use of other regions of the electromagnetic spectrum is highly desirable and current research activity is particularly focused on several topics: (1) green and red LEDs in the visible range and (2) UVA, UVB and UVC LEDs in the ultraviolet (UV) range, including far ultraviolet-C (Far-UVC) LEDs. In these cases, the improvement of LED efficiency is based on the development of innovative routes from material growth to the device fabrication process. Indeed, UV LEDs with high external quantum and wall plug efficiencies require epitaxial layers with low defect densities (dislocations, point defects, unintentional impurities, etc.); a highly radiative active region; doped layers with high carrier concentrations, low resistivities for efficient carrier injection and low power consumption; and a high light extraction efficiency (LEE). Optimizing all these parameters via epitaxial techniques involves structural, optical and electrical engineering in terms of strain management (alloying control and defect control), quantum confinement (localization effect and wavelength emission), polarization discontinuity (radiative efficiency and doping efficiency), device design (injection, extraction, and wall plug efficiency), etc.
The present Special Issue intends to highlight the results of experimental and theoretical investigations (full-length articles or reviews) on emerging UV LEDs, UV laser diodes (LDs) and UV modules including green–red LEDs. Research into both the safety and efficacy of AlGaN-based UV LEDs should continue, as well as the research into material choices and device designs. Combining these approaches, which have been pushed forward by disruptive technologies, will then lead to the emergence of high-efficiency green–red and UV LEDs, and enable the development of new applications and key technologies.
Dr. M. Ajmal Khan
Guest Editor
Manuscript Submission Information
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Keywords
- nitride materials
- semiconductor devices
- UV modules
- AlGaN-based UV LEDs
- 17 sustainable development goals (17-SDGs);
- severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2);
- virus inactivation;
- bacteria inactivation;
- fungus inactivation;
- far UVC LEDs;
- heat sink model for LED;
- UV LED module or panel;
- LED device simulation;
- UV plant lightning;
- safety standard of UV light;
- threshold limit values (TLVs)
