Common sense and application of UV LED
When it comes to ultraviolet light, everyone's first reaction is radiation. In fact, ultraviolet light is also a powerful weapon that can destroy pathogens.
Authoritative data show that 99% of microorganisms can be killed by ultraviolet rays, and even the new coronavirus can also be killed by ultraviolet rays.
1. UV classification
UV is the abbreviation of ultraviolet, and common ultraviolet rays are divided into three types: UV-A, UV-B, and UV-C.
UV-A and UV-B are light waves with relatively strong penetrating power, which can reach the surface of the earth.
UV-A can penetrate deep into our skin. We usually wear sunscreen when we go out to prevent UV-A from damaging our skin. UV-A is mainly used for sensing industrial printing and curing of adhesives in the printing industry or detection of counterfeit currency.
UV-B is less harmful than UV-A, and proper absorption can promote the growth of vitamin D. Mainly used for phototherapy or horticultural applications.
UV-C, also known as deep ultraviolet, has the weakest penetrating ability but the strongest energy.
Ultraviolet disinfection lamps mostly use UV-C light waves. Its radiation can effectively and harmlessly treat bacteria, germs and fungi. It is widely used in the disinfection and purification of air, water and object surfaces, and can kill bacteria, viruses and mold spores. and other 99% microorganisms.
Take our ordinary bedroom as an example, as long as the ultraviolet germicidal lamp is turned on for half an hour, a healthy environment with less bacteria can be obtained.
2. The principle of ultraviolet disinfection lamp sterilization
The use of ultraviolet rays of appropriate wavelengths can destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in the cells of microorganisms, causing growth cell death and/or regenerative cell death, impairing the metabolic function of bacteria, and Can cause genetic problems in bacteria.
The continuous ultraviolet irradiation will eventually cause the death of the bacterial population and achieve the effect of sterilization and disinfection.
In addition to preventing bacteria from replicating and regenerating, UV light can also reduce the "activity" of the microorganisms themselves.
Under visible light with a wavelength of 300 to 500 nm, the bacteria themselves have a photorecovery enzyme that will make the bacterial population very active and multiply.
Using UV-C irradiation can greatly reduce the reproduction of bacteria. This is why using UV disinfection lamps is better than the common alcohol disinfection.
3. The choice of ultraviolet disinfection lamps
At present, most UV-C sterilization application principles on the market are based on the traditional light source technology of mercury light source.
There are several fatal drawbacks to using mercury light sources.
①Because of the high photoelectric conversion efficiency of the mercury lamp, most of the light emitted by the mercury lamp is visible light and infrared light, and the sterilization efficiency is low.
②Environmental pollution of mercury lamps, the emission spectrum of mercury lamps has far-ultraviolet light below 200nm, which will generate a large amount of ozone, and will produce a smell after a long time of use.
③ Energy consumed by mercury lamps The service life of large mercury lamps is relatively short, only 800-1000 hours, and secondary pollution caused by discarded mercury lamps.
Similar to the advantages of LED technology in traditional lighting solutions, UV-C LEDs have incomparable advantages in the field of sterilization solutions that traditional light sources cannot match.
①It can be lit instantly, and it can reach 100% power UV output immediately without preheating.
②The service life is super long, and the service life is more than 10 times that of the traditional UV mercury lamp curing machine.
③Lower power consumption, the power consumption is only 10% of the traditional mercury lamp curing machine, which can save 90% of the power.
After several years of joint R&D and various research projects with leading partners in the industry and technology, GMKJ LED has launched the first LED UV-C disinfection lamp in the low and medium power range, a small chip that can clean and purify in an instant.
From laptops to mobile phones, even a small bottle cap, the 42mW chip design makes disinfection under control and enjoys a safe and healthy environment.
4. Use of LED UV-C
GMKJ LED UV-C supports air, water, surface disinfection and purification. People from different applications and disciplines work together to ensure that the system can be used safely and effectively.
Air sterilization
Indirect irradiation: Under the condition of no one indoors, a high-intensity ultraviolet sterilizer can be used, which not only has a considerable effect, but also can be used when there are people moving indoors.
Direct irradiation: In indoor unattended conditions, UV disinfection lamps can be used for hanging or mobile direct irradiation. When using indoor suspended UV disinfection, the number of indoor UV disinfection lamps installed is not less than 1.5W per square meter.
For example, on faucets, washing machines or ventilation systems, it can meet the disinfection work of furniture, and it can disinfect and purify without mercury and chemicals, and occupy a small space.
According to the experiment, whether it is indirect irradiation or direct irradiation, the irradiation time of ultraviolet disinfection lamp for more than 30 minutes has the best sterilization effect.
Water treatment
Unlike chlorine disinfection, UV disinfection adds chemicals to water. It is a physical disinfection method, which will not have side effects on the human body when used for drinking water disinfection, and will retain minerals that are beneficial to the human body.
Experts in biology themselves suggest that the wavelength of 200-280nm in the ultraviolet UVC region is suitable for water treatment and sterilization.
Not only that, ultraviolet sterilization has a wide range and fast speed. Under a certain radiation intensity, general pathogenic microorganisms can be killed in only ten seconds. It can kill some bacteria that cannot be inactivated by chlorine disinfection, and can also control some bacteria to a certain extent. Higher aquatic organisms such as algae and red worms.
Surface sterilization
The LED UV-C light source irradiates the surface of food, materials, etc., and has a fast, efficient and pollution-free sterilization effect, thereby maintaining the high quality of the product.
Compared with traditional sterilization methods, surface sterilization has the characteristics of fast sterilization speed, continuous processing and batch processing, simple operation, environmental protection and no secondary pollution.
With GMKJ LED 3-5mW UVC chip design, lighting, refrigerators, washing machines and other appliances can evolve "autonomous" purification functions. Furniture disinfection without trade-offs between safety and power. Due to the small size of GMKJ LED UV-C light source, it is suitable for more diverse application fields and a wider range of sterilization. In addition to the above applications, GMKJ LED UV-C can also be applied to interior disinfection of automobiles, sterilization of door equipment, air purification of air conditioning systems, treatment by medical means or induction fields, etc.
At the moment when the epidemic continues to develop, until a more sustainable future, from offices, furniture and equipment to medical places and teachers, larger space and higher frequency disinfection requirements mean higher power and more complex R&D tasks.
