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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 are gradually entering our field of vision, and some companies are involved in research, improvement, and application of UV LED UV lamps. 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.
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 having a wavelength 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 in the fields of biomedical, anti-counterfeiting, air purification, data storage and military aviation in the sterilization, disinfection and other markets, focusing on special lighting.
Application areas 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 sheet, and save 90% energy. Large output, resistance to coin scraping, comprehensive economic benefits. This means that the UV LED curing market is a full-scale and full-cycle application market.
Microelectronics industry - UV curing applications: mobile phone component assembly (camera lens, earpiece, microphone, housing, LCD module, touch screen coating, etc.), hard disk head assembly (gold wire fixing, bearing, coil, die bonding, etc.) DVD/digital camera (lens, lens bonding, Circuit Board reinforcement), motor and component assembly (wire, coil fixing, coil end fixing, PTC/NTC component bonding, protection transformer core), semiconductor chip (moisture protection coating) Layer, wafer mask, wafer contamination inspection, UV tape exposure, wafer polishing inspection), sensor production (gas sensors, photoelectric sensors, fiber optic sensors, photoelectric encoders, etc.).
PCB industry LEDUV light curing applications: components (capacitors, inductors, various plug-ins, screws, chips, etc.) fixed, moisture-proof potting and core circuits, chip protection, anti-oxidation coating protection, circuit board type (corner) coating, Ground wire, flying wire, coil fixed, wave soldering through hole mask.
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 improve the growth of the skin, thereby effectively treating vitiligo, pityriasis rosea, pleomorphic sun rash, chronic actinic dermatitis. In the medical industry, UV phototherapy is now more and more used in the medical industry. Compared to traditional light sources, UV-LED's spectral lines are pure, which can guarantee the maximum therapeutic effect. The UVB band can also be applied to the health care field. The UVB band can cause photochemical and photoelectric reactions of the human body, and the skin produces a variety of active substances, which are currently used to regulate advanced neurological functions, improve sleep, and lower blood pressure. In addition, studies have shown that the UVB band can accelerate the production of polyphenols in certain leafy vegetables (such as red lettuce), which are claimed to have anti-cancer, anti-cancer proliferation and anti-cancer mutations.
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 in 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. The optimization and control of UV light sources is very important for the manufacture of reliable medical devices. The use of UV-curable glue offers many advantages, such as lower energy requirements, saving cure time and location, increasing productivity and making automation easier. UV glue is commonly used to bond and seal medical devices that require very high quality and best reliability. UV glue curing is typically applied to medical device assembly, such as the need to bond 1) different materials (or different mechanical properties) 2) the material is not thick enough to use the welding method 3) pre-production of the parts.
Sterilization 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. Due to its small size and other advantages, UV-LED can be used as a light source for complete UV (ultraviolet) sterilization equipment. It is suitable for pre-packaging process of various types of structures and various materials for large-volume product flow-through operations; UV (ultraviolet) light source of bacteria machine: suitable for indoor air sterilization in households, public places, etc.; used in various household appliances such as disinfection cabinets and microwave ovens.
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.
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 confidentiality and mobility requirements.
Ultraviolet (UV) interference: The emergence of ultraviolet two-color guided missiles will inevitably lead to the development of infrared-UV two-color interference technology. The key to ultraviolet interference is to study gunpowder with sufficient ultraviolet radiation to add interference to make ultraviolet interference. bomb.
Ultraviolet (UV) Warning: The UV Alarm is a feature that detects the target's tail flame radiation by using a combination of ultraviolet (UV) radiation from the missile's tail flame to list missiles 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.
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 applied in the facility; the low temperature and low temperature of the vegetable in the off-season cultivation makes 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 have been more than 80 plant factories in China, and hundreds of thousands of hectares have been planted in greenhouses.
Soot purification equipment application areas:
According to the report from Haining Yaguang, the ultraviolet photolysis oxidizing fume purification system is the most advanced photolysis oxidizing fume purification system in China. In this purification system, a special 185nm+254nm UV lamp plays a role as a core. It can decompose the grease 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.
Exhaust gas treatment application areas:
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.
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.
Banknote identification:
Ultraviolet recognition technology mainly uses fluorescent or ultraviolet sensors to detect the fluorescent imprint of banknotes and the matte reaction of banknotes. This type of identification technology recognizes most counterfeit currency (such as washing, bleaching, pasting, etc.). This technology is the earliest development, the most mature, and the most common application. It is used not only in the ATM deposit identification, but also in financial instruments such as money counters and money detectors. In general, fluorescent and violet light are used to perform all-round reflection and transmission detection of banknotes. According to the different absorption rate and reflectivity of ultraviolet light from banknotes and other papers, the authenticity is recognized. The banknotes with fluorescent marks can also be quantitatively identified.
Photoresist hardening application areas:
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 UV LED curing light, the curing time of the UV curing resin does not need 10 seconds, and it can be cured in 1.2 seconds, which is much faster than the traditional UV mercury curing machine. At the same time, the heat is also ideal than the UV mercury lamp. By differently blending the components of the UV curable resin, products that meet different requirements and uses can be obtained. At present, UV curable 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, metal parts (such as motorcycle parts) coating, fiber coating, photoresist and coatings of precision parts.
Editor: Yingzi
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