Brief analysis of UVC LED application
发布时间：2021-11-09 09:35
来源：萤光创新
With many advantages such as safety, environmental protection, compactness, high efficiency and low consumption, deep UV LED has been gradually recognized by the market. It has been preliminarily applied to water treatment, air sterilization, food preservation and other fields.
1、 Deep UV LED market
Deep UV LED has been recognized by the market for its performance advantages such as safety, environmental protection, compactness, high efficiency and low consumption. It has seen clues in the fields of water purifiers, mother and baby products, air conditioners, refrigerators and other high-end consumer goods. The principle of deep ultraviolet sterilization and disinfection is that deep ultraviolet can destroy the molecular structure of genetic material DNA or RNA in micro organisms, resulting in bacteria unable to reproduce or even inactivate, so as to achieve the purpose of sterilization and disinfection. The main parameter to measure the sterilization efficiency is the irradiation dose received by bacteria (irradiation dose (MJ / cm2) = irradiation time (s) * deep ultraviolet irradiation intensity (MW / cm2)). The greater the irradiation dose, the higher the disinfection efficiency.
2、 Deep UV LED sterilization advantages
Compared with other sterilization methods, such as chlorination, ozone and UV mercury lamp sterilization, deep UV LED sterilization has many advantages:
High bactericidal efficiency. The killing effect of UVC ultraviolet light emitted by deep UV LED on bacteria and viruses is generally within a few seconds. Traditional water sterilization methods such as chloride and ozone generally take 20 minutes to 1 hour to achieve deep UV sterilization efficiency;
It is widely bactericidal. Because bacteria, virus antigens and other microorganisms are not resistant to ultraviolet light, deep ultraviolet light can kill almost all bacteria and viruses efficiently, and deep ultraviolet LED sterilization technology can inhibit the growth of some higher aquatic organisms to a certain extent, such as algae, red insects, paramecium, etc;
Safety and environmental protection (without mercury). The most obvious advantage of deep UV LED devices over mercury excited UV lamps in the current market is that its sterilization light source does not contain mercury, and mercury is a heavy metal substance, commonly known as mercury. Mercury can evaporate at room temperature, and mercury vapor and mercury compounds are highly toxic (chronic). Once the lamp tube is broken in the sterilization process of traditional UV mercury lamps, It will cause serious water pollution, and deep UV LED device is a safe and reliable device without heavy metals, simple operation and safe and reliable operation;
Energy saving, long service life and low maintenance cost. Deep UV LED sterilization is gradually replacing the common UV sterilization of mercury lamp in the market. One of the important reasons is that UV LED has low power consumption and is very energy-saving. The power of deep UV LED is about one tenth of that of mercury lamp, which greatly saves the cost;
The utility model has the advantages of small volume, flexible design and convenient installation. The deep ultraviolet LED device has small volume, and the design of its sterilization device is flexible. It can be applied in the narrow space where the traditional ultraviolet mercury lamp cannot be applied.
3、 Deep UV LED Applications
Deep UV LED products are gradually recognized in the market because of their many advantages. Now they have been preliminarily applied in the fields of water treatment, air sterilization, food preservation and so on.
Typical UV dose requirements for UVC disinfection / purification applications:
（1） Water treatment, disinfection and purification
1. Static water irradiation
According to the formula: irradiation dose (MJ / cm2) = irradiation time (s) * deep ultraviolet radiation intensity (MW / cm2), the ultraviolet sterilization efficiency is related to the ultraviolet irradiation dose received by bacteria. In static water irradiation, there are two ways to improve the sterilization efficiency of deep UV LED: 1) improve the irradiation time; 2) Improve the irradiation intensity of deep UV LED. When the light power of deep UV LED remains unchanged, the sterilization rate can be improved by prolonging the irradiation time. When the sterilization time is fixed, the greater the input current of deep UV LED, the greater the optical power, the greater the radiation energy, and the greater the amount of ultraviolet radiation received by bacteria, so the sterilization rate is higher. At the same time, for the deep UV LED with a certain input current, prolonging the irradiation time can also increase its total radiation energy. The greater the total irradiation received by bacteria, the higher the sterilization rate.
2. Dynamic water irradiation
For dynamic water sterilization, the irradiation time of deep UV led to dynamic water is determined by the water flow. In the case of a certain intensity of deep ultraviolet, the greater the water flow, the smaller the irradiation time, the lower the irradiation dose received by bacteria, and the worse the sterilization effect. The reason is that the faster the water flow speed, the less time the bacteria receive deep ultraviolet radiation, resulting in the low dose of deep ultraviolet radiation, so the sterilization efficiency is reduced.
（2） Air purification
As a new generation of green light source, deep ultraviolet LED provides an effective solution for air purification with its unique safety and economic advantages. Deep UV LED air sterilization and disinfection treatment system can also be used for any equipment requiring fresh and fresh air, such as air purifier, refrigerator, etc. For refrigerators without deep UV LED sterilization module, the natural bacterial attenuation rate is 30%, while for refrigerators with deep UV LED sterilization module, the bacterial attenuation rate reaches 85%, which also well proves the deep UV LED sterilization effect, keeps the bacterial content in the air of the refrigerator refrigeration room at a low level, and improves the fresh-keeping ability of the refrigerator to a greater extent.
（3） Food preservation
In terms of food preservation, deep UV LED shows its excellent characteristics. Without other chemical reagents, only one deep UV LED can improve the preservation capacity of fresh fruits and vegetables by 10-20 times at room temperature, and reduce the loss caused by decay to a greater extent.
Qingdao fluorescent Innovation Technology Co., Ltd. has a professional postdoctoral team, focusing on the research of ultraviolet sterilization application. After years of deep cultivation in the ultraviolet industry, the company has obtained a number of national invention and utility model patents. At present, a number of sterilization module products have been put into the market. For more details, you can browse the company website www.qdyingguang.com, contact the company for WeChat's official account.
Keywords: UVC, UVC led, deep UV, UV sterilization, deep UV LED, water sterilization, water disinfection, air disinfection, air purification, flowing water sterilization, static water sterilization
