What is UV LED UV light? What are the main application areas of UV LED ultraviolet light? With the continuous development of LED research and development, LED technology innovation and application fields continue to expand, and the LED market is becoming wider and wider. UV LEDs gradually enter our field of vision. For the general public, the right amount of ultraviolet light at the right wavelength is also a necessary light wave for our body. So let's take a look at the main applications of UV LEDs today.
UV LED ultraviolet light main application areas
Ultraviolet Rays (Abbreviated UV) refers to the visible light of the sun's rays (red orange, yellow, green, blue, and purple), and the invisible light outside the purple.
Ultraviolet light is a general term for radiation from 10 nm to 400 nm in the electromagnetic spectrum. According to the difference of wavelength, the ultraviolet light is generally divided into three bands of A, B and C, as follows: UVA is 400-315 nm, UVB is 315-280 nm, and UVC is 280-100 nm. Corresponding to different wavelengths, the specific application is different.
In the UVLED market, UV-A has the largest market share, up to 90%. Its main application market is curing, involving nail art, teeth, ink printing and other fields. In addition, UV-A is also imported into commercial lighting to make white clothing look whiter.
As for UV-B and UV-C, it is mainly used in sterilization, disinfection, medical phototherapy, etc. Among them, UV-B is mainly medical, and UV-C is sterilization. In addition, UV LEDs are recognized from banknotes, applied to hardening of optical resins, insect trapping, printing, and development of biomedical, anti-counterfeiting, air purification, data storage and military fields in the sterilization, disinfection and other markets, with special lighting.
1. Application fields in light curing systems
The typical applications of UVA band are UV curing and UV inkjet printing, representing wavelengths of 395nm and 365nm. UV LED light curing applications include UV adhesive curing in display, electronic medical, instrumentation and other industries; building materials, furniture, home appliances, UV coating curing in automotive and other industries; UV ink curing in printing, packaging and other industries...
Among them, the UV LED veneer industry has become a hot spot. The biggest advantage is that it can produce zero-formaldehyde environmentally-friendly plates, and it has 90% energy saving, large output, resistant to coin scraping, and comprehensive economic benefits. This means that the UV LED curing market is a full-scale and full-cycle application market.
2. Medical field
Skin treatment: An important application of the UVB band is dermatological treatment, ie UV phototherapy.
Scientists have found that ultraviolet light with a wavelength of around 310 nm has a strong black spot effect on the skin, which can accelerate the metabolism of the skin and increase the growth of the skin, thereby effectively treating pityriasis rosea, pleomorphic sun rash, chronic actinic dermatitis, and light. In the medical industry, ultraviolet phototherapy is now more and more used in the medical industry.
Medical Devices: UV glue bonding makes economical automated assembly of medical devices easier. Nowadays, the advanced LED UV light source system, which can cure solvent-free UV glue for a few seconds, as well as the dispensing system, makes an effective and economical method for consistent and repetitive bonding of medical device assembly processes.
3. Sterilization and disinfection field
Due to the short wavelength and high energy, the ultraviolet light in the UVC band can destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in cells of microorganisms (bacteria, viruses, spores, etc.) in a short time, and cells cannot be regenerated. The bacterial virus loses its ability to self-replicate, so the UVC band products can be widely used for sterilization such as water and air.
Some deep-UV applications on the market include LED deep-UV portable sterilizer, LED deep-UV toothbrush sterilizer, deep-UV LED contact lens cleaning sterilizer, air sterilization, clean water sterilization, food and surface sterilization. . With the improvement of people's awareness of safety and health, the demand for these products will be greatly increased, thus creating a larger market.
4. Military field
Since the UVC band belongs to the solar blind ultraviolet band, it also has important applications in the military, such as short-range ultraviolet security communication, ultraviolet interference, and ultraviolet warning technology.
Ultraviolet (UV) communication: Ultraviolet communication is a new type of communication with great potential for development. It has many advantages that other conventional communication methods do not have, such as low eavesdropping rate, high anti-interference, low resolution, and all-weather work, so it is widely valued by departments with high requirements for confidentiality and mobility.
Ultraviolet (UV) interference: The emergence of ultraviolet two-color guidance will inevitably lead to the development of infrared-UV two-color interference technology. The key to UV interference is to study the interference bombs with sufficient ultraviolet radiation and to add UV interference.
Ultraviolet (UV) Warning: The UV Alarm is a feature that detects the target by detecting ultraviolet (UV) radiation in the tail flame and lists the characteristics of the tail flame that use different fuels at low altitudes. Active alarms that rely on radar operation and passive alarms that include infrared, laser, and ultraviolet (UV) alarms.
5. Plant factory area
According to Liu Wenke, a researcher at the Institute of Agro-Environment and Sustainable Development of the Chinese Academy of Agricultural Sciences, closed soilless cultivation tends to cause accumulation of self-toxic substances, while TiO2 photocatalytic degradation of root exudates and rice husk degradation in substrate nutrient solution The product, sunlight only contains 3% of ultraviolet light, and the covering material of the facility such as glass is filtered out more than 60%, which cannot be used in the facility; the low temperature and low temperature of the vegetables in the off-season cultivation make the efficiency low and the stability is poor, which can not meet the facility vegetable factory. The need for chemical production.
The artificial light TiO2 photocatalytic system suitable for use in horticultural soilless cultivation, especially for plant plants, has been developed, and the demand is urgent and the commercialization potential is huge. As of June 2015, there are hundreds of plant factories in China, and hundreds of thousands of hectares are cultivated in greenhouses.
6. Fume purification equipment application field
Ultraviolet photolysis oxidizing fume purification system is currently the domestic advanced photolysis oxidizing fume purification system. In this purification system, a special UV lamp with 185nm+254nm functions as a core. It can decompose the oil and odor in the kitchen air, and has the advantages of no secondary pollution, reduced fire hazard, small size, important lightness, and greatly reduced maintenance cost.
7. Exhaust gas treatment application field
According to reports, the total amount of VOCs emitted by China's textile industry accounts for about 30% of the total emissions of industrial VOCs. VOCs are one of the precursors of smog formation and an important component of PM2.5. The photocatalytic oxidation treatment of VOCs with UV LED as photocatalytic light source is superior, and has the advantages of small volume, high catalytic activity, stable chemical properties, low cost and non-toxicity, and has wide application prospects.
8. Gem identification field
Different types of gems, the same gemstones of different colors, and gems of different coloring mechanisms of the same color have different UV-visible absorption spectra. Some of the optimized gems have the same color as their corresponding natural gems, but the absorption spectra vary depending on the color-causing mechanism or color-causing substances. UV LEDs help identify gemstones and distinguish between certain natural and synthetic gemstones, as well as distinguishing between natural gemstones and artificially treated gemstones by UV light.
9. Banknote recognition
Ultraviolet identification technology mainly uses fluorescent or ultraviolet sensors to detect the fluorescent mark of the renminbi and the matte reaction of the renminbi. This type of recognition technology recognizes most of the fake bi (such as washing, bleaching, pasting, etc.). This technology is the earliest development, the most mature, and the most common application.
10. Photoresist hardening application field
The UV curable resin is mainly composed of an oligomer, a crosslinking agent, a diluent, a photosensitizer and other specific additives. It irradiates the polymer resin with ultraviolet light to cause a cross-linking reaction to be instantaneously cured.
Under the illumination of UV LED UV curing machine, the curing time of UV curing resin does not need 10 seconds, and it can be cured in 1.2 seconds. It is much faster than traditional UV mercury curing machine.
At the same time, the heat is also ideal than the UV mercury lamp. By meeting different components of the UV curable resin, products that meet different requirements and uses can be obtained.
At present, UV curing resins are mainly used for wood floor coating, plastic coating (such as PVC decorative board), photosensitive ink (such as printing of plastic bags), electronic product coating (marking and circuit board printing), printing glazing ( Such as paper, playing cards glazing, metal parts (such as motorcycle parts) coating, fiber coating, photoresist and coatings of precision parts.