A novel application of photocatalysis was investigated to reduce diurnal evaporative fuel vapor emissions from automobiles. light-weight annulus photocatalytic device designed, fabricated, and characterized for its performance the oxidation emissions. The prototype made with PVC pipe ultraviolet (λ = 365 nm) light emitting diodes (UV LEDs) as sources. Commercially available Evonik P25 TiO2 used...

of the Dissertation . . . . . . . . . . . . . . . . . . . . . . . xvi Chapter

With the widespread of novel coronavirus (SARS-CoV-2), inactivation bacteria and viruses using ultraviolet (UV) light has been reevaluated. However, there are many applications where safety to human body itself effect questioned, is a movement review UV-C guidelines (Global Lighting Association, Position Statement on Germicidal Irradiation SAFETY GUIDELINES, 2020). Since Minamata Convention Mer...

We present the electrical and optical design, assembling, thorough experimental characterization of two compact arrays short-wavelength ultraviolet (UV-C) light-emitting diodes (LEDs) suitable for near-field irradiation. Through a combination technical expedients, we have achieved effective thermal management such that long-lasting irradiations are possible without appreciable deterioration UV-...

We prepared wavelength-dependent InGaN-based light emitting diodes (LEDs) with peak emissions ranging from 400 to 445 nm, and investigated their efficiency droop characteristics at injection currents of up to 1 A. We found that the emissions of the wavelength-dependent InGaN LEDs underwent blue shifts at elevated currents. In addition, although the external quantum efficiencies (EQEs) changed d...

Because light-emitting diodes (LEDs) are low-coherent, quasimonochromatic, and nonthermal, they are an alternative for low level laser therapy, and have photobiostimulative effects on tissue repair. However, the molecular mechanism(s) are unclear, and potential effects of blue and/or green LEDs on wound healing are still unknown. Here, we investigated the effects of red (638 nm), blue (456 nm),...

This study introduces a long-pass dichroic filter (LPDF) on top of a phosphor-converted LED (pc-LED) packing associated with each corresponding tunable orthosilicate ((Ba,Sr)2SiO4:Eu) phosphor in order to fabricate tunable green pc-LEDs. These LPDF-capped green pc-LEDs provide luminous efficacies between 143–173 lm/W at 60 mA in a wavelength range between 515 and 560 nm. These tunable green pc-...