Light-emitting diodes (LEDs) are available in a wide range of wavelengths. The original LEDs emit infrared light, followed by LEDs that emit visible wavelengths (red and green), then blue LEDs that emit white light when coupled with phosphorescent bodies. Historically, the most difficult LEDs to produce were those that emitted light in ultraviolet light. today, however, the ultraviolet light-emitting diode (UV LED) industry is experiencing tremendous growth.
The three ranges of UV light are UV-A, UV-B and UV-C. UV-A, also known as near-UV or black light, has a wavelength range of 315 nm to 400 nm. UV-B, also known as medium-wave light, has a wavelength range of 280 nm to 315 nm. UV-C, also known as short-wave UV light, has a wavelength range of 200 nm to 280 nm. we will UV-C is discussed here.
UV-C radiation is unique in that it is particularly effective in disinfection. In particular, the wavelength of 264 nm is impressive in killing bacteria, viruses and germs. Fortunately, UV-C radiation can pass through the air without producing ozone, so it is possible to use UV-C lamps in the air to disinfect surfaces. Some people may be concerned that using UV-C LED lamps will produce ozone (which is harmful to health and the environment). However, the only vacuum LED wavelengths can produce ozone (<200 nm). UV-A, UV-B and UV-C wavelengths do not convert oxygen (in the air) into ozone.
The UV-C disinfection market is booming, partly due to recent outbreaks and the fear of viruses and bacteria (e.g. SARS, MERS, MRSA, Ebola, Norovirus and C-DIFF). UV LEDs can play a useful role in preventing infectious diseases. They can be used to make drinking water, replace chlorine as a water disinfectant in swimming pools, kill bacteria in washing machines and dishwashers, kill airborne bacteria in air purifiers and HVAC systems and disinfect surfaces in hospitals, kitchens, schools, offices and nursing rooms. UVC LED products are already available for high-end applications such as industrial water purification, but to meet the huge disinfection consumer market, there is a strong demand to reduce the cost of LED chips.
The challenge in packaging UV-C LEDs is to mount the window on top of the LED package. Almost all organic materials absorb UV-C radiation, so using the same "spherical top" silicone on visible, UV-A and UV-B LEDs is not suitable for UV-C LEDs. Another unique challenge with UV-C LEDs is the low efficiency. Conventional UV-C LEDs have an efficiency of ≤15%, so it is important to include an anti-reflective (AR) coating on both sides of the window to maximise the photon emission of the package.
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Higher forward current 80mA is available
275nm 280nm, 310nm deep Robust deep UV UVC light source
Radiant power: 16-18mW
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low power consumption, low thermal resistance
Lifespan: 50% aging after 10000hours.
When exposing micro-organisms to UVC light, the light penetrates their cell walls and disrupts their DNA molecule structure,
prohibiting reproduction. And because UV disinfection doesn't rely on chemicals or filtration materials, it can be used effectively
and safely in many applications including water and air disinfection.