UV violet wavelengths is shorter than visible light, but longer than the X-ray electromagnetic wave.The meaning of UV is Ultra Violet, UV light is the shortest wavelength of the visible light, it often referred to as “black light”, because these wavelengths of light is not visible for human eye.To distinguish it from the point of view of human health and environmental effects, UV violet wavelength is divided into three levels:
- UVA (315 ~ 400nm), also known as long-wave violet or black light.
- UVB (280 ~ 315nm), also known as medium wave violet.
- UVC (200 ~ 280nm), also known as shortwave violet or sterilization purple.
Sunlight contains three bands of UV: UVA, UVB, UVC, but due to the ozone layer air absorption, 99% of the ground UV is the UVA band.
UV LED has the usage below:
UV LED current usage include: optical sensors and instruments (230-400nm), UV authentication, bar code (230-280nm), surface water sterilization (240-280nm), the identification and body fluid detection and analysis (250-405nm) protein analysis and drug discovery (270-300nm), medical light therapy (300-320nm), polymer and ink printing (300-365nm) and detection of forgeries (375-395nm), surface sterilization / Beauty sterilization (390-410nm ).
The advantages of UV applications is:
- No solvent - the greenhouse effect
- there are conducive to environmental protection
- workplace pollution-free
- rapid production
- curing at room temperature
- products have unique properties
- to save energy
- easy to wash
- to save space
- high gloss
- less waste
- Methods diversity, adaptability, product replacement fast.