The distinctive wide-band blue illumination absorption and red strait-line discharge of the phosphor K2SiF6:Mn4+ (KMnSF) make it an attractive material for manufacturing warm white light-emitting diodes (WLED). Nevertheless, using the highly corrosive raw ingredient HF to produce commercial KMnSF red phosphor has negative effects on the environment and people. In this study, microfluidic technology was used to successfully manufacture the KMnSF without the need for HF compound while resulting in a phosphor product with homogenous granule shape and size. The luminescence capabilities of the KMnSF samples were then thoroughly examined and characterized. Eventually, we made WLED packages comprising of blue LED chips, yellow phosphor Y3Al5O12:Ce3+ (YGA:Ce), red phosphor KMnSF, and SiO2 scattering particle. Via varying the SiO2 concentration during the simulation process, the prepared WLED’s optical performances are obtained. The scattering properties of the phosphor layer as well as the lighting transmission and distribution were simulated with the utilization of both LightTools software and Monte Carlo theory. According to the outcomes, the microfluidic-synthesized K2SiF6:Mn4+ proves to be appropriate for WLED apparatuses. Besides, the proposed phosphor compound with SiO2 scattering particles showed the improvement in luminous flux and angular uniformity of the WLED.

This study compares red-phosphor LaOF:Eu³⁺ impacts on a single-film remote phosphor configuration (SRPC) and a double-film remote phosphor configuration (DRPC). Mie theory is used to demonstrate the relationship between light flux and color quality. SRPC is a phosphor layer consisting of LaOF:Eu³⁺ particles mixed with YAG:Ce³⁺. Meanwhile, DRPC is two separate films of red and yellow phosphors. To increase scattering properties, we added 5% SiO₂ into phosphor layers. The differences in structure affect significantly white light emitting diodes’ (WLEDs’) optical properties. Attained figures and statistics show that the color rendering indices (CRIs) increase along with the concentrations of both structures, and these numbers are approximately similar. However, DPRC exhibits a color quality scale (CQS) of 74 in all examined chromatic temperatures (5600 K - 8500 K), which is greater than SRPC’s 71 at 8500 K. Besides, the luminous efficiencies (LEs) in DRPC are more outstanding than that of SRPC, at given LaOF:Eu³⁺ concentration percentages (2%-14%). To summarize, DRPC offers greater benefits in luminous flux and color quality, compared to SRPC. Choosing the proper red light phosphor concentration, on the other hand, becomes a crucial aspect of achieving the ideal CQS and LEs.

The present article a simple and controllable method for synthesizing cobalt oxide nanoparticles (CoO and Co₃O₄) with adjustable particle dimensions and morphologies. Cobalt glycerolate was first obtained by refluxing cobalt nitrate and glycerol for four hours, then thermally decomposed at 450–650oC under a mixed oxygen/nitrogen atmosphere for one hour to produce cobalt oxide nanoparticles. The structural phases and crystallite sizes were investigated using X-ray diffraction (XRD) and calculated via the Scherrer equation, while investigated and scanning electron microscopic examination (TEM and SEM) confirmed particle shape, size distribution, and surface uniformity. By varying the decomposition temperature, both particle size and phase composition were effectively controlled—lower temperatures favoring smaller CoO nanoparticles and higher temperatures producing larger, well-crystallized Co₃O₄ particles. The resulting nanoparticles exhibit uniform morphology, high crystallinity, and controllable dimensions, making them suitable for diverse applications in lithium-ion batteries, chemical sensors, and nanoelectronic devices. This straightforward synthesis strategy offers an efficient and scalable route for tailoring cobalt oxide nanomaterials with desirable structural and functional properties.

MgO was produced utilizing Andrographis paniculata (A. paniculata), which forms cubic crystallites having a median dimension of 35 nm. SEM analysis shows the development of nano-bars (diameter - length: 46 nm - 185 nm). The illuminating spectra revealed oxygen deficiencies at 467 nm. This has high antimicrobial properties, having zones of restriction of 19 mm and 29 mm versus disease-causing agents from seafood and food. The compound has anti-udder cancer effect (IC50: 15.76 μg/mL for human mammary adenocarcinoma MCF-7) and is biocompatible.

This study investigates carrier recombination dynamics in InGaN/GaN quantum wells using time-resolved techniques, including induced grating methods, time-resolved photoluminescence, and pump–probe spectroscopy. Diffusion and carrier lifetime dependency on excitation density is systematically analyzed for structures with varying indium compositions and barrier configurations. The results reveal that carrier lifetime decreases while diffusion coefficients increase with rising excitation density, indicating enhanced nonradiative recombination under high carrier concentrations. This behavior is more pronounced in samples with higher indium content, suggesting a strong influence of carrier localization. The experimental observations are interpreted using an extended ABC recombination model that incorporates carrier density–dependent recombination processes. The analysis demonstrates that defect-assisted recombination becomes dominant at high excitation levels, while Auger recombination remains negligible within the investigated carrier density range. Furthermore, pump–probe measurements confirm distinct recombination pathways associated with localized and delocalized carrier states. These findings provide important insights into the physical mechanisms governing carrier dynamics and performance droop in InGaN-based quantum well designs, offering guidance for the optimization of high-performance optoelectronic devices.