Deep ultraviolet (DUV) optical wireless communications have seen increased interest in recent years due to the unique properties of light this spectral region. However, reported DUV data rates remain significantly lower than comparable demonstrations at visible wavelengths modulation bandwidths and/or output power sources. Here, we present a wavelength division multiplexing demonstration using ...

The aim of this study is to verify the reciprocity law in wastewater disinfection process using UV light. optical power UV-LEDs used were 1.6 mW and 50 mW, wavelengths 265 nm 275 nm. E. coli, Enterococcus faecalis, Clostridium perfringens three microorganisms analysed study. results showed lower inactivation rates around 0.063–0.065 cm2/mJ for 0.047–0.049 compared with other two bacteria. For c...

AlGaN-based UV LEDs have proven to broad applications in many fields including sterilization, disinfection, purification, and phototherapy, but the performance still needs be further improved. Benefiting from advantages such as better current spreading, lower self-heating effect higher light extraction efficiency achieved by reduced LED size, micro-LEDs are expected improve quantum thus can exp...

Highly efficient light-emitting diodes (LEDs) emitting ultraviolet (UV), blue, green, amber and red light have been obtained through the use of InGaN active layers instead of GaN active layers. Red LEDs with an emission wavelength of 675 nm, whose emission energy was almost equal to the band-gap energy of InN, were fabricated. The dependence of the emission wavelength of the red LED on the curr...

Light of different wavelengths is essential for plant growth and development. Short-wavelength radiation such as UV can shift the composition of flavonoids, glucosinolates, and other plant metabolites responsible for enhanced defense against certain herbivorous insects. The intensity of light-induced, metabolite-based resistance is plant- and insect species-specific and depends on herbivore fee...

A source of collimated ultraviolet (UV) light is a central piece of equipment needed for lithographic fabrication of microfluidic devices. Conventional UV light sources based on high-pressure mercury lamps require considerable maintenance and provide broad-band illumination with intensity that often changes with time. Here we present a source of narrow-band UV light based on an array of nine 36...

INTRODUCTION Non-melanoma skin cancer is the most common malignancy worldwide. Differentiating between malignant and benign skin tumors, however, can be challenging. As a result, various auxiliary tools have been developed to aid in the diagnosis of cutaneous neoplasms. Here, skin tumors were investigated through analysis of their digital image histograms and spectroscopic response under ultrav...

In the <span>scenario of solid-state lighting (SSL) gradually replacing old standard techniques; pc-LEDs (or diodes based on conversion phosphor) becomes a common method for creating white illumination, SSL. As now, both UV-LEDs and blue LEDs have been still being considered task illumination through phosphor excitation as it hasn’t known which LED type is truly superior. It that when com...

The increasing demand for light emitting diodes (LEDs) is driven by a number of application categories, including display backlighting, communications, signage, and general illumination. Nowadays, they have also become attractive candidates as new photometric standards. In recent years, LEDs have started to be applied as wavelength-selective photo-detectors as well. Nevertheless, manufacturers'...