With this study, we report on the reliability of most recent commercial UVC LED devices. The current COVID-19 pandemic urged development antiviral technologies, and one effective is based irradiation, which can be effectively achieved by means Deep UV LEDs. systems LEDs strongly depends their efficacy reliability. We propose an in-depth analysis four different state-of-the-art suitable for disi...

Comparison of optical power, external quantum efficiency in InGaN/GaN UV LEDs at room temperature and liquid nitrogen is carried out. The spectral densities the current low-frequency noise have been investigated. mechanisms carrier transport, formation noise, dependences rates radiative nonradiative recombination temperatures are considered. Keywords: External efficiency, defect tunneling.

We report a method to nucleate, grow, and transfer single crystal ZnO with control over location, orientation, size, shape, and final substrate material. The process uses an oxygen plasma treatment in combination with a photoresist pattern on Magnesium doped GaN substrates to define a narrow nucleation region and attachment points with desired 100 nm scale dimensions. Nucleation is followed by ...

A possibility of YVO4:Eu phosphor as a red phosphor for the application to ultraviolet (UV) light emitting diodes (LEDs) was investigated. Bi was used as a sensitizer for Eu to improve photoluminescence (PL) intensity in the longer wavelengths region than 350 nm and Bi-sensitized YVO4:Eu phosphor was characterized in terms of crystal structure, and PL excitation/emission spectra. Addition of Bi...

The current and temperature dependences of the electrical, power spectral characteristics high-power deep UV LEDs (λ≈ 270 nm) have been studied. main parameters LED (internal quantum efficiency light extraction efficiency) which determine output capacity are calculated using ABC-model. influence distribution, electrical losses thermal resistance as factors limiting energy possibilities were est...

Core-shell GaN/AlGaN multiple quantum wells (MQWs) embedded in a p–n junction are integrated on the upper part of GaN microwires grown by silane-assisted metal organic vapor phase epitaxy. Dispersed wires then contacted electron beam induced deposition for fabrication single wire UV-LED devices. Rectifying diode-like behavior is first demonstrated both and p-n junctions without MQW active regio...

We investigated the lethal effects of visible light on insects by using light-emitting diodes (LEDs). The toxic effects of ultraviolet (UV) light, particularly shortwave (i.e., UVB and UVC) light, on organisms are well known. However, the effects of irradiation with visible light remain unclear, although shorter wavelengths are known to be more lethal. Irradiation with visible light is not thou...

We report a method to nucleate, grow, and transfer single crystal ZnO with control over location, orientation, size, shape, and final substrate material. The process uses an oxygen plasma treatment in combination with a photoresist pattern on Magnesium doped GaN substrates to define a narrow nucleation region and attachment points with desired 100 nm scale dimensions. Nucleation is followed by ...