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UVC light output of 66 mW at 300 mA CW has been achieved from LEDs on AlN substrates with extensive photon extraction. Proper vessel design allows for efficient irradiation of a water sample for purification.
Improvements to 260 nm ultraviolet light emitting diodes has led to wall plug efficiencies greater than 5% and output powers of 50 mW for a single chip in continuous wave operation.
We designed and fabricated 260 nm ultraviolet light emitting diodes that were pseudomorphically grown on AlN substrates. Thinning the substrates, roughening the emission surfaces, and encapsulating contributed to increasing the photon extraction efficiency by more than one order of magnitude.
We designed and fabricated 260 nm ultraviolet LEDs which demonstrated 20mW with greater than 1.5% WPE. Through surface roughening, substrate thinning and encapsulation, a 6× improvement in photon extraction efficiency has been achieved.
Ultraviolet-C (UVC) disinfection is considered environmentally friendly since it does not create any chemical load on the environment and does not generate any hazardous byproducts. Mercury lamps (which are essentially fluorescent lights without the phosphors) are currently used by municipalities to generate UVC but mercury lamps are not an attractive solution for low volumes or non-continuous use...
Light sources in the wavelength range below 300nm have attracted extensive attention due to their applications in instrumentation and in disinfection of water, air and surface. Nitride-semiconductor-based, light emitting diodes (LEDs) are of especially great interest due to numerous advantages compared to conventional mercury lamps. Although significant progress of more than 9mW of quasi-CW power...
The use of low defect density bulk AlN substrates has led to reliable pseudomorphic ultraviolet light emitting diodes capable of mW level power outputs from packaged devices emitting from 250–275 nm.
The development of pseudomorphic layers on low dislocation density AlN substrates is leading to improvements in reliability and performance of devices operating in the UVC range.
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