4 results about "Far ultraviolet" patented technology

A fully transparent ultraviolet (UV) or far-ultraviolet (FUL) LED is disclosed, wherein all semiconductor layers except the active region are transparent to radiation emitted in the active region. A key technology enabling this invention is a transparent tunnel junction, which replaces the light-absorbing p-GaN and metal mirror p-contact regions currently found in all commercially available UV LEDs. This tunnel junction also allows for the use of a second n-AlGaN current-diffusing layer above the active region (on the p-side of the device), similar to the current-diffusing layer already present below the active region (on the n-side of the device). Therefore, small-area and / or remote p-contact and n-contact regions can be used, and light can be extracted from both the top and bottom sides of the device. This fully transparent semiconductor device can then be encapsulated using a transparent material to form a fully transparent UV or FUL LED with high brightness and high efficiency.

A disinfection device system of a building comprising: a controller comprising at least one processor and at least one memory having instructions stored thereon that, when executed by the at least one processor, are configured to cause the at least one processor to: monitor one or more conditions of a space in the building; and selectively activate and deactivate at least one Far UV-C disinfection device installed in the space using the conditions of the space and one or more of an energy budget, a target total operating cost, or a net emissions target, wherein the Far UV-C disinfection device comprises at least one Far UV-C light source structured to output disinfecting light at a wavelength between 200 nm and 230 nm.

An unmanned surface vessel (USV) system for algae control, based on 222nm mercury-free far-ultraviolet lamps and their combined processes, belongs to the field of water environment management technology. Addressing the issues of delayed response to cyanobacterial blooms in water sources, limited treatment capacity of existing mobile devices with closed reactors, and single-parameter control, the system uses an USV as its platform, integrating a 222nm mercury-free far-ultraviolet lamp matrix, an automatic dosing unit, and an intelligent sensing and adaptive control module. The mercury-free far-ultraviolet lamp matrix adopts an open structure, directly immersed in the water body for large-area in-situ irradiation; the intelligent sensing and adaptive control module collects multi-dimensional parameters such as algal density, chlorophyll a, and algal toxins in real time; the central control system incorporates a built-in PID multi-parameter coupling model to dynamically adjust the irradiation intensity and dosing dosage, using algal toxin concentration as the feedback endpoint to form a closed-loop control. It possesses advantages such as wide-area in-situ coverage, high efficiency, mercury-free environmental protection, and on-demand intelligent energy saving, making it suitable for routine operation and maintenance and emergency response in lake and reservoir-type water sources.