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Electron-Beam-Pumped UVC Emitters Based on an (Al,Ga)N Material System

NANOMATERIALS (2023)

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Summary: Far-ultraviolet radiation C light (far-UVC; 222 nm wavelength) has been considered as a safer light for killing pathogenic bacteria and viruses, but its effectiveness and potential biological damage compared to 254-UVC (254 nm wavelength) were unclear. This study found that 222-UVC caused slightly less DNA damage but had a significant effect on motility loss and severe damage to the sensory nervous system in a model organism, Caenorhabditis elegans. In contrast, 254-UVC had a higher impact on survival of eggs and chromosomal condensation. These results suggest that 222-UVC is less penetrating but causes more severe damage in tissues near the surface.

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Summary: Far UV-C radiation, with wavelengths between 200 and 230 nm, is highly effective in inactivating airborne pathogens while having minimal potential to cause damage to human skin and eye tissues. By controlling indoor ozone production, Far UV-C devices can be used in occupied spaces to improve the inactivation of airborne pathogens, including those responsible for COVID-19.

CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY (2023)

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NANOMATERIALS (2023)

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Far-UVC (222 nm) efficiently inactivates an airborne pathogen in a room-sized chamber

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Deep-UV emission at 219 nm from ultrathin MBE GaN/AlN quantum heterostructures

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Deep-ultraviolet light-emitting diodes with external quantum efficiency higher than 20% at 275 nm achieved by improving light-extraction efficiency

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Deep ultraviolet emission from ultra-thin GaN/AlN heterostructures

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Dominance of radiative recombination from electron-beam-pumped deep-UV AlGaN multi-quantum-well heterostructures

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Determination of axial and lateral exciton diffusion length in GaN by electron energy dependent cathodoluminescence

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Overview of band-edge and defect related luminescence in aluminum nitride

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E-beam pumped mid-UV sources based on MBE-grown AlGaN MQW

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Growth and Characterization of AlGaN Multiple Quantum Wells for Electron-Beam Target for Deep-Ultraviolet Light Sources

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Catastrophic Degradation of Pulsed Lasers Based on AlGaAs/InGaAs/GaAs Heterostructures with Electron-Beam Pumping

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Structural design of AlN/GaN superlattices for deep-ultraviolet light-emitting diodes with high emission efficiency

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Polarization property of deep-ultraviolet light emission from C-plane AlN/GaN short-period superlattices

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Localization potentials in AlGaN epitaxial films studied by scanning near-field optical spectroscopy

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Effect of low-energy electron irradiation on the cathodoluminescence of multiple quantum well (MQW) InGaN/GaN structures

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Characteristics of Electron Emission from a (Pb,La)(Zr,Ti)O-3 Ferroelectric Cathode

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Indium Droplet Elimination by Radical Beam Irradiation for Reproducible and High-Quality Growth of InN by RF Molecular Beam Epitaxy

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Optical and electron beam studies of carrier transport in quasibulk GaN

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APPLIED PHYSICS LETTERS (2009)

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Threshold displacement energy in GaN: Ab initio molecular dynamics study

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AlGaN quantum well structures for deep-UV LEDs grown by plasma-assisted MBE using sub-monolayer digital-alloying technique

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Electron irradiation of AlGaN/GaN and AlN/GaN heterojunctions

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APPLIED PHYSICS LETTERS (2008)

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Electron emission and plasma generation in a modulator electron gun using ferroelectric cathode

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT (2006)

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Nucleation and growth of GaN/AlN quantum dots

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Influence of AlN overgrowth on structural properties of GaN quantum wells and quantum dots grown by plasma-assisted molecular beam epitaxy

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Photoluminescence study of AlGaN-based 280 nm ultraviolet light-emitting diodes

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Cathodoluminescence study of carrier diffusion in AlGaN

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Electron-beam-induced-current study of defects in GaN; experiments and simulation

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A ferroelectric electron gun in a free-electron maser experiment

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Surfactant effect of gallium during molecular-beam epitaxy of GaN on AlN (0001)

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Laser-driven high-current-density pulsed electron emission from lead zirconium titanate ferroelectric ceramic

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Electron emission from ferroelectrics

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