From the Starry Sea illuminated by led to see the UV LED in front of us, this scene is deja vu!
发布时间：2021-11-16 14:44
来源：萤光创新
At present, there are two technical products in UV sterilization technology to form an obvious contrast: low pressure UV sterilization mercury lamp products and deep UV LED products.
The service life of low-pressure ultraviolet sterilization mercury lamp is 8000 hours. The main wavelength is 253.7 nm with high sterilization efficiency. Taking single end 18W as an example, the radiation efficiency is more than 23%, and the high power can reach 30-40%. Moreover, the lamp power is from 1W to 300W, which can meet the needs of different use scenarios, and the light maintenance rate is high. Low pressure ultraviolet germicidal mercury lamps are divided into two categories: quartz tube and high boron glass. Quartz tube ultraviolet sterilization lamp is the material with the highest ultraviolet transmission, which can transmit more than 90% of 253.7nm ultraviolet; The utility model has the advantages of high ultraviolet intensity, long service life, small light attenuation and good sterilization effect. The service life of the lamp is generally more than 8000 hours. The high boron glass of the high boron tube ultraviolet sterilization lamp transmits 253.7 nm ultraviolet light, which is only about 50%; Its ultraviolet radiation intensity is small and its service life is short.
The biggest problem of low-pressure ultraviolet sterilization mercury lamp is "Mercury". According to the provisions of Minamata convention formulated by the United Nations Environment Programme, China, as one of the main parties to Minamata convention, has actively implemented the provisions of the Convention and banned mercury in an orderly manner. Therefore, it is imperative to develop new technology products to completely replace the low-pressure ultraviolet sterilization mercury lamp!
Deep UV LED products are the best option to replace low-pressure UV sterilization mercury lamp products. Deep UV LED lamp contains no mercury, healthy and environmental protection. However, the current deep UV LED has low radiation efficiency, generally 3% - 5%, which is only 1 / 10 of that of low-pressure UV sterilization mercury lamp, and the price of unit electric power is 20 times that of low-pressure mercury lamp. Therefore, to obtain the same radiation power, the cost of deep UV LED is 200 times that of low-pressure mercury lamp. It can not be used in high-power sterilization occasions, but it can be used in low-power sterilization occasions.
This scene is very similar to the early LED lighting products replacing the traditional energy-saving lamp products! UV LED industry chain covers different fields such as new materials, precision equipment, chips, packaging, medical application products, consumer electronics products, purification products, industrial products and lighting and sterilization products. It has the advantages of small and portable, environmental protection, safety and easy design. It will form a trillion industry in the future, which is by no means empty talk! But UV LED still has a long way to go to form a huge industry!
Technical research
Deep UV LED has just started. Different from the mature blue LED, the core material of UV LED has lower in content and higher Al content, which makes the problems of high defect density in epitaxial layer, low hole concentration in p-AlGaN material, strong polarization effect, unbalanced carrier transport and so on extremely prominent. Therefore, the luminous efficiency of UV LED is still far lower than that of mature blue LED. When the emission wavelength is lower than 370nm, UV LED is facing the problem of sudden decline in emission efficiency, which has become the biggest obstacle to its large-scale application.
At present, although much progress has been made in technical research, there are still many technical bottlenecks in terms of power, volume energy conversion, materials, equipment and cost price of deep UV LED, which urgently needs further breakthroughs by technical R & D personnel.
Standard aspect
As the sterilization of deep UV LED is still in its infancy, there is no national mandatory implementation standard at present. Only the standard of traditional low-voltage UV sterilization mercury lamp is referred to. The difference of technical characteristics between the two determines that it is impossible to copy and use it. Therefore, the Standardization Committee of the national semiconductor lighting engineering R & D and Industry Alliance (CSA) organized the preparation of the report on the standardization system of ultraviolet LED, and launched the construction of standards such as the terms and definitions of ultraviolet LED technology and application, and the report on ultraviolet LED sterilization and disinfection technology. The group standard of UVC led drinking water sterilization device is open for comments. It is understood that the standard clearly stipulates the UVC led drinking water sterilization device, that is, the sterilization device for drinking water treatment composed of ultraviolet light-emitting diode unit, driving power supply and control unit with wavelength range of 260nm-280nm. In addition, in the technical requirements, the standard makes corresponding requirements on 9 aspects, such as service conditions, appearance, structure, materials, health and safety, purified water flow, sterilization effect, effluent quality, functional life and environmental protection, so as to ensure the sterilization quality of drinking water.
It can be seen that the UV LED standard system is gradually being built, but these standards are far from enough to adapt to the current development of UV LED. More, more accurate and more detailed UV LED standards are required, and local governments and associations are also required to vigorously support the standard construction of UV LED.
Whether it is technological breakthrough in technological research, active exploration and innovation in market application, gradual construction of standard system, guidance and strong support of government industrial policies... Are all trying to promote the healthy and sustainable development of UV LED industry! In the 1990s, it was remembered by future generations because high-efficiency blue and green LEDs based on gallium nitride were born at that time. We believe that with the joint efforts of all colleagues in the UV LED industry, UV LED will bloom its due dazzling light and usher in its own star sea!
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 sterilization, air purification, flowing water sterilization, static water sterilization
