Zhang Guohua: application product practice and market forecast of UV LED

From: China Lighting Network

At present, the novel coronavirus is still continuing, which has a certain degree of impact on industry and enterprises, and also affects people's hearts in all walks of life. In this situation, under the guidance of the national semiconductor lighting engineering research and development and Industry Alliance and the third generation semiconductor industry technology innovation strategic alliance, China semiconductor lighting network and Jizhi headlines have started knowledge sharing during the epidemic period to help enterprises solve their doubts. Help our LED lighting enterprises and industries overcome difficulties together!

In this issue, we invited Zhang Guohua, an engineering technology application researcher of Qingdao Jiesheng Electric Co., Ltd., to share the wonderful theme of "UV LED application product practice and market prediction". The following is the transcript:

1、 Comparison of ultraviolet sterilization and traditional mercury lamp

Led not only has achieved full-color luminescence, but also can emit infrared and ultraviolet light. Ultraviolet mainly refers to the band between 400nm and 100nm, which can be divided into UVA, UVB, UVC and uvv. Among them, the uvv band from 200nm to 100nm can only propagate in vacuum. UVA is burn band (main use for curing at present), UVB is medical band (medical repair function), deep UV UVC is sun blind band (sterilization, etc.). It can be seen that sterilization is closely related to wavelength, only UVC band can kill bacteria, not all ultraviolet rays have bactericidal effect. In addition, UV sterilization also requires a certain dose, which also needs to be noted.

Deep UV sterilization has a history of more than 100 years. Every time the virus is rampant, we will pay special attention to UV. Ultraviolet sterilization is a very effective way and is widely used.

In terms of the effective band of sterilization, the wavelength should be between 240nm and 280nm, the main UV wavelength of mercury lamp is 254nm, and the wavelength of UV LED is generally 275nm. Some studies have pointed out that the 265nm band is the most effective sterilization. However, from the practical research, the bactericidal effect of 254nm and 275nm is in the same order of magnitude. The novel coronavirus is novel coronavirus. The research found that the killing rate of new coronavirus is 99.99%, and the dose needed is 1445uJ/cm2

Compared with the traditional LED light source, mercury free lamp has the advantages of high efficiency, high efficiency, low power consumption, high efficiency and no pollution.

Comparison between traditional mercury lamp and new UV LED

Deep UV LED and traditional mercury lamp have their own advantages, but they are not simple substitutes. UV LED is mainly to develop new application fields, but with the coming into force of Minamata Convention and the implementation of mercury ban, the application of UV-LED will be more and more widely, and the demand will be more and more.

2、 Usage and application site precautions

1. How to use UV-LED

Low voltage: single chip: 5.5v-8v, 20-100ma

Easy to control: intelligent control

Switch characteristics: kill and use immediately, not afraid of stroboscopic.

Heat dissipation condition: at present, the energy conversion efficiency is only 2-5%, which causes serious heating when UV-LED works normally, so heat dissipation is particularly important.

2. Precautions for use

Air sterilization: (basic research and testing)

Using the bactericidal function of deep ultraviolet ray can effectively block the spread of bacteria, especially viruses in the air. Air conditioner, air conditioner, air conditioner, air conditioner.

Food sterilization: (basic research and testing)

It can effectively kill bacteria, molds and even viruses and prolong the shelf life of food by directly irradiating the food with preservative film. Applicable products: refrigerator, all kinds of disinfection cabinet, dehumidifier, air sterilizer (desktop, vehicle mounted)

Basic research and test of clean water

The penetration of deep ultraviolet in water can effectively kill bacteria and viruses and ensure the safety of drinking water. Applicable products: household water dispenser, disinfection cup, fish tank sterilization, disinfection pen and other disinfection drinking water appliances.

Compared with the traditional mercury lamp, the dynamic sterilization of flowing water has many advantages, including instant use, high efficiency and greatly prolonging the service life of UV-LED. Led belongs to the cold light source of solid-state luminescence, and has no heating phenomenon to water. UV-LED does not produce any ozone and has no effect on the taste of water. UV-LED itself is non-toxic and harmless, and it is very safe and reliable in water disinfection.

It should be noted that sterilization and inhibition of bacterial growth are different concepts. Sterilization is the killing of existing bacteria. Inhibition of bacterial growth is to prevent and inhibit bacterial infection and growth. There is a great difference in the required UV luminous flux between the two occasions, which can be compared to the thorough cleaning and cleaning of the room.

Medical devices:It can be used in blood therapy and phototherapy because of its anti-inflammatory, analgesic, stimulating antibody growth and accelerating healing.

3、 UV sterilization mask scheme and application cases of related products

At present, the novel coronavirus poses a threat to the health of the whole nation. The main route of transmission is droplet transmission, which causes respiratory and pulmonary diseases. Mask is an important tool for prevention. The sudden spread of virus makes it difficult to buy masks, and the idea of sterilization of masks comes from this.

At present, the commonly used masks, such as N95 or medical masks, have good filtering effect, but they are easy to breathe if they are worn for a long time. Especially for doctors in ICU Wards and emergency departments, they feel very stuffy after wearing them for a long time.

The scheme of sterilization mask is: the mask has a special air inlet system, filtering and sterilization functions, forming a micro positive pressure at the mouth and nose, which is similar to the clean working principle of our semiconductor industry clean workshop. Clean at the same time to ensure smooth breathing. This will be very easy to breathe, face breathing area of positive pressure, so that there is no resistance to breathing.

At the same time, we develop a special mask for patients infected with virus, which can be sterilized and filtered in the outgassing system to ensure that the exhaled gas is clean and virus-free. Block the respiratory route of infection.

hot wire! It is understood that at present, enterprises have begun mass production of sterilization masks, which is worth looking forward to.

4、 Technology progress and trend forecast of UV application products

1. Development opportunities

In the face of novel coronavirus outbreak, health and health products have received widespread recognition and recognition. Because of the sterilization of microorganisms, the experience is very poor, which is not conducive to marketing. The naked eye can't see whether viruses and bacteria are killed.

At present, the sterilization market still needs to be cultivated and guided. However, the outbreak of the outbreak out of control, the market to pay more attention to health products, our UV sterilization products bring great opportunities and challenges.

2. Product technology progress and trend

The technical performance of UV-LED products has been improved rapidly, and our goal of Jason (Yuanrong) has always been to strive to achieve the best performance price ratio of UV-LED. At present, the service life of UV LED has exceeded 10000 hours.

From the perspective of the development of UV LED industry chain, the special MOCVD equipment for deep UV LED is currently a bottleneck for the industrialization of deep UV LED. If there are epitaxial equipment for large-scale production like blue LED, it will play a key role in improving the generation efficiency of UV LED and greatly reducing the cost. However, the chip and package are not very different from the current blue light technology.

In the aspect of epitaxial chip technology, in addition to patterned substrate, there are also homogeneous epitaxial substrate, namely aluminum nitride substrate. From the point of view of packaging process, the proportion of packaging cost is still relatively high, which needs to continue to optimize and reduce the material cost of packaging.

UV LED is widely used, which is a new and challenging market. It is very important to develop application products according to the needs of the market.

3. Develop together with UV detection

At present, the technology of UV detector is developing rapidly, which is very helpful to the application of UV LED. Ultraviolet detection and ultraviolet luminescence complement each other in application, which can be said to be twin brothers. Take the mask as an example, if the mask with sterilization effect is applied to a very dangerous situation, it is necessary to ensure the safe and normal operation of the sterilization function. If the UV detection function is added, the actual working condition of the UV LED can be monitored at any time. If the UV LED works abnormally, it can be guaranteed by detecting the ultraviolet luminous intensity and luminous efficiency and giving feedback alarm immediately Objective to prove the reliability and safety of mask sterilization. At present, ultraviolet detection has been applied in the field of water sterilization.

As an enterprise engaged in the production and sales of UV LED for many years, according to the actual market sales situation, it is said that 2018 is the first year of UV LED, and the next ten years will be a period of explosive growth, so the prediction is reasonable.

With the improvement of UV LED technology and the rapid decline of its price, as well as the continuous expansion of new application fields and huge market capacity, the statement that the market scale of UV LED and its application market is trillion is based on and worthy of expectation.

It is expected that under the guidance of the alliance, more enterprises and people with lofty ideals will participate in this field. The development of a large industry must be a gathering effect. The finer the division of labor in the market, the more mature the industry will be. Competition and cooperation are inevitable market rules.