Hakutulokset - deep UV LED
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III-Nitride Deep UV LED Without Electron Blocking Layer
Julkaistu 2019-01-01Aiheet: Hae kokotekstiAlGaN-based deep UV (DUV) LEDs generally employ a p-type electron blocking layer (EBL) to suppress electron overflow. However, Al-rich III-nitride EBL can result in challenging p-doping and large valence band barrier for hole injection as well as epitaxial complexity. As a result, wall plug efficien...
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Improving the Efficiency of Transverse Magnetic Polarized Emission from AlGaN Based LEDs by Using Nanowire Photonic Crystal
Julkaistu 2018-01-01Aiheet: Hae kokotekstiAlGaN-based deep ultraviolet (UV) light-emitting diodes (LEDs) are attractive for a wide range of applications. To date, however, the best reported external quantum efficiency (EQE) for LEDs operating in the wavelength range of ∼240 nm is well below 1%. In this paper, we have p...
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Simulation of Carrier Injection Efficiency in AlGaN-Based UV-Light-Emitting Diodes
Julkaistu 2024-01-01“…Numerical simulations of carrier transport in aluminium gallium nitride based ultraviolet light emitting diodes (UV-LED) are performed in order to understand injection efficiency for light sources in the deep ultraviolet. …”Numerical simulations of carrier transport in aluminium gallium nitride based ultraviolet light emitting diodes (UV-LED) are performed in order to understand injection efficiency for light sources in the deep ultraviolet. With our simulator, calibrated with experimental data from a 265 nm UV-LED, qu...
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Deep Ultraviolet CMOS-Controlled Micro Light-Emitting Diode Array
Julkaistu 2023-01-01“…We report a Deep Ultraviolet (DUV) AlGaN micro-light emitting diode (micro-LED) array driven by a matching array of electronic drivers implemented in Complementary Metal-Oxide-Semiconductor (CMOS) technology. …”We report a Deep Ultraviolet (DUV) AlGaN micro-light emitting diode (micro-LED) array driven by a matching array of electronic drivers implemented in Complementary Metal-Oxide-Semiconductor (CMOS) technology. This 40 × 10 pixel integrated device required improvements in micro-LED fabricat...
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Germicidal Efficiency of 272 nm LED in Relation to the Hospital Strain of Klebsiella Pneumoniae
Julkaistu 2023-11-01“…Shortwave — UV-C and UV-B -light emitting diodes (LED) are a relatively new type of UV radiation sources and potentially able to meet the requirements of current medical technologies. …”Relevance. Currently, the use of ultraviolet (UV) radiation for the disinfection of objects and the treatment for infectious diseases is considered as a promising alternative to chemical biocides and antibiotics. Shortwave — UV-C and UV-B -light emitting diodes (LED) are a relatively new type of UV...
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Recent HPLC-UV Approaches for Cannabinoid Analysis: From Extraction to Method Validation and Quantification Compliance
Julkaistu 2025-05-01“…Since the 1990s, cannabis has experienced a gradual easing of access restrictions, accompanied by the expansion of its legalization and commercialization. This shift has led to the proliferation of cannabis-based products, available as cosmetics, food supplements, and pharmaceutical dosage forms. …”Since the 1990s, cannabis has experienced a gradual easing of access restrictions, accompanied by the expansion of its legalization and commercialization. This shift has led to the proliferation of cannabis-based products, available as cosmetics, food supplements, and pharmaceutical dosage forms. Co...
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Optimization of a Natural-Deep-Eutectic-Solvent-Based Dispersive Liquid–Liquid Microextraction Method for the Multi-Target Determination of Emerging Contaminants in Wastewater
Julkaistu 2025-07-01“…This work presents the development of a simple and environmentally friendly dispersive liquid–liquid microextraction (DLLME) method based on a hydrophobic natural deep eutectic solvent (NADES) for the determination of selected compounds from benzotriazole, benzothiazole, paraben, and UV filter families in wastewater samples. …”The widespread discharge of industrial and urban waste has led to significant increases in the environmental concentrations of numerous chemical substances. This work presents the development of a simple and environmentally friendly dispersive liquid–liquid microextraction (DLLME) method based on a...
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Analysis of 270/290/330-nm AlGaN-Based Deep Ultraviolet Light-Emitting Diodes With Different Al Content in Quantum Wells and Barriers
Julkaistu 2015-01-01“…The optical and electrical properties of 270/290/330-nm AlGaN-based deep ultraviolet (UV) light-emitting diodes (LEDs) with different Al content in quantum wells and barriers have been investigated systematically. …”The optical and electrical properties of 270/290/330-nm AlGaN-based deep ultraviolet (UV) light-emitting diodes (LEDs) with different Al content in quantum wells and barriers have been investigated systematically. Based on the experimental and numerical study, it is observed that the UV LEDs with lo...
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Enhancing Light Extraction Efficiency of Vertical Emission of AlGaN Nanowire Light Emitting Diodes With Photonic Crystal
Julkaistu 2019-01-01“…However, AlGaN shows strong transverse magnetic polarization in deep UV range, which severely prevents light extraction from top surface of UV-LEDs. …”AlGaN alloys have been widely used to make ultraviolet light-emitting diodes (UV-LEDs) because its energy bandgap covers 200–360 nm wavelength range. However, AlGaN shows strong transverse magnetic polarization in deep UV range, which severely prevents light extraction from top...
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The Impact of Resonance on the Light Extraction Efficiency of Single Nanowire Ultraviolet Light Emitting Diodes
Julkaistu 2020-01-01“…The study on the far-field distribution indicates that the variation of far-field patterns at different conditions can be conveniently explained by the geometrical optics theory. This deep understanding provides benefits to design the nanowire UV LEDs.…”Fabricating the nanowire ultraviolet light emitting diodes (UV LEDs) has been a promising candidate to dramatically enhance the external quantum efficiency (EQE) of UV LEDs. For a great luminescent performance, it is necessary to understand the propagating features of light inside the nanowire. The...
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Light Extraction Efficiency Analysis of Flip-Chip Ultraviolet Light-Emitting Diodes With Patterned Sapphire Substrate
Julkaistu 2018-01-01“…Thus, it is expected that this study will serve as a guidance in designing PSS for high-efficiency mid- and deep-UV LEDs.…”This study investigates polarization-dependent light extraction efficiency (<italic>η</italic><sub>extraction </sub>) of AlGaN-based flip-chip ultraviolet (UV) light-emitting diodes (LEDs) emitting at 230 nm and 280 nm with microdome-shaped patterning on...
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Optical Properties of Eu3+-Doped Y2O3 Nanotubes and Nanosheets Synthesized by Hydrothermal Method
Julkaistu 2018-01-01“…The results showed that a novel Eu<sup>3+</sup> environment exists in Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> nanosheets, which led to rapid decay of emission at 611 nm. The unique properties of Y<sub>2</sub>O<sub>3</sub>:Eu<sup> 3+</sup> nanosheets could lead to potential applications in white light-emitting diodes (LEDs) based on GaAlN deep UV LEDs.…”Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> nanomaterials were obtained using a low-cost, large-scale, solution-based hydrothermal method followed by a thermal annealing process. The morphology of the Y<sub>2</sub>O<sub>3 </sub>:E...
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Assessment of the State of Cell Membranes against the Background of Prolonged Use of Anticytokine Therapy in Patients with Ulcerative Colitis
Julkaistu 2019-11-01“…The accumulated by mankind 20 years of experience with the use of genetically engineered drugs has led to a number of questions regarding, among other issues, safety in the long-term administration of biological therapy. …”Biological therapy in the treatment of immune-mediated conditions has changed their course, the quality of life of patients and the prognosis of diseases. The accumulated by mankind 20 years of experience with the use of genetically engineered drugs has led to a number of questions regarding, among...
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Rapid Assessment of Canned Fish Quality via Fast Protein and Metabolite Liquid Chromatography
Julkaistu 2025-03-01“…The sensor has a photometric detector based on a deep UV LED emitting at 255–265 nm. All chromatograms showed two combined peaks: the first one was related to proteins and the second one was formed by adenosine ATP metabolites. …”The consumption of canned fish as an affordable and shelf-stable food product having high nutritional value is steadily growing in many parts of the world. An important and often overlooked factor that influences the quality of canned fish is the freshness of raw materials used in the production pro...
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AGW-YOLO-Based UAV Remote Sensing Approach for Monitoring Levee Cracks
Julkaistu 2025-01-01“…Ablation results revealed that incorporating the ADown module reduced the baseline's parameters by 18.6%, although it led to a slight decrease in recognition accuracy and recall. …”ObjectiveRecently, the identification of cracks in river levees primarily relies on manual inspections, which suffer from low efficiency, high costs, and significant safety risks. Although deep learning technologies have made notable progress in enhancing detection automation, several challenges rem...
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