Abstract:Light-emitting diodes (LEDs) can emit radiation that spans the range from near infrared (IR) to all three bands of ultraviolet (UV) radiation: UV-A, UV-B, and UV-C. This report focuses on LEDs that emit in one of the three UV bands because they have the potential to displace lowpressure mercury vapor (LPMV) lamps in a variety of industrial processes, including ink and adhesive curing, medical procedures, and germicidal disinfection. However, before emerging UV LED technologies can displace LPMV lamps, the effi… Show more
“…The findings from these measurements indicate that the electrical characteristics of the COB LED DUTs during RTOL testing changed little between the beginning and end of the study which is in sharp contrast to the recent study of ultraviolet (UV) LEDs. In the study of UV LED I-V characteristics, significant changes in the electrical properties of the UV LEDs occurred during I-V measurements as a result of trap-assisted tunneling at sub-threshold voltages [21]. These electrical changes accounted for some of the radiant flux depreciation in UV LEDs.…”
“…The findings from these measurements indicate that the electrical characteristics of the COB LED DUTs during RTOL testing changed little between the beginning and end of the study which is in sharp contrast to the recent study of ultraviolet (UV) LEDs. In the study of UV LED I-V characteristics, significant changes in the electrical properties of the UV LEDs occurred during I-V measurements as a result of trap-assisted tunneling at sub-threshold voltages [21]. These electrical changes accounted for some of the radiant flux depreciation in UV LEDs.…”
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