The deep UV industry chain is gradually moving towards the high-end, and some problems still need to be improved

After several years of certification, it is basically determined that in the three scenarios of water, air and surface applications, whether in the commercial, industrial or consumer fields, water treatment is the most deterministic market of UVC-LED and the fastest growing market.

 

 

 

Industry insiders predict that the proportion of UVC-LED in the water treatment market will increase from 42% in 2021 to 54%, with a compound growth rate of 36% from 2021 to 2026. The proportion of air sterilization market in UVC-LED will remain between 20% and 25%, with a compound growth rate of 28% from 2021 to 2026. The surface sterilization is expected to decrease from 34% in 2021 to 24%, and the compound growth rate from 2021 to 2026 will reach 21%.

 

 

 

It is not completely estimated that the market scale of deep ultraviolet LED and its derivatives will be more than 60 billion yuan in domestic schools, hospitals, white goods, high-speed rail and other fields. With the large-scale application of logistics and transportation, it will form a market scale of 100 billion yuan.

 

 

Potential market scale of China's deep UV LED in the field of disinfection and sterilization

 

 

 

The high-end industry still faces three major problems

 

 

 

The deep UV LED industry chain covers substrate preparation, epitaxial growth, device manufacturing, packaging and testing, etc. There is still a big gap between China and foreign countries in mastering the core technology, which is mainly reflected in the weak substrate preparation ability, insufficient epitaxial growth level, and the slow progress in research and development of short wavelength and high-power products.

 

 

 

1. Influenced by the weak substrate preparation capacity, the high-end breakthrough of the industry lacks stamina.

 

 

 

The aluminum nitride substrate can effectively alleviate the stress accumulation during the epitaxial process, reduce the defects of epitaxial wafers, and greatly improve the performance and life of devices. It is the basis for realizing shorter wavelength, higher power deep UV optoelectronic devices. The preparation of aluminum nitride substrate usually adopts PVT (physical vapor transport) method, which is difficult and expensive. First, the preparation conditions are harsh. The physical and chemical properties of aluminum nitride are extremely stable, which requires 2200 ℃ and 60KPa high-temperature and high-pressure environment to prepare; Second, the challenge of equipment and materials is great. Crucibles are the key equipment for substrate preparation. Since the PVT process will produce a large amount of highly corrosive aluminum vapor, even special materials such as graphite and boron nitride cannot meet the requirements. Only materials such as osmium, tungsten and tantalum carbide that are more difficult and costly can be selected.

 

 

 

2 - Affected by technology path locking, industrial competition faces performance and cost disadvantages.

 

 

 

Subject to the embargo of aluminum nitride substrate and high cost, the research, development and industrialization of deep ultraviolet LED in China have all adopted the method of epitaxial growth of aluminum nitride on sapphire substrate to replace it. While realizing technical convenience, it also brings challenges in product yield and cost control: First, the epitaxial growth cycle becomes longer. It is usually necessary to epitaxial grow aluminum nitride 3 to 5 microns thick on sapphire substrate for subsequent process. The epitaxial growth time is 4 hours longer than that of aluminum nitride substrate, which is extremely unfavorable for cost control; Second, the epitaxial wafer crystal quality is poor. Due to the lattice mismatch between sapphire and aluminum nitride, the defect density of the epitaxial layer is usually 108cm-2, 104 times that of aluminum nitride substrate. The high defect density results in the electro-optical conversion efficiency of domestic products being only 3%; Third, the device life is short. As the thermal conductivity of sapphire is far lower than that of aluminum nitride, the heat dissipation effect of the device is far less than that of aluminum nitride substrate. At present, the products of Chinese enterprises are obviously homogeneous, which are generally milliwatt devices with wavelengths of 255-280 nm. In contrast, shorter wavelength and watt devices with wavelengths of 225 nm have been developed abroad.

 

 

 

3 - Affected by the lack of industrial standards and application demonstration, the product introduction channel is not smooth.

 

 

 

The deep UV LED industry is still in its infancy. Due to the different luminous characteristics from traditional UV light sources, the variety of products and the different maturity of market segments, the necessity and urgency of re establishing industry standards are more prominent. At present, China has not yet implemented the national mandatory standards, and only the standard reference materials such as the Report on the Standardization System of Ultraviolet LED, the Terms and Definitions of Ultraviolet LED Technology and Application, and the Technical Report on Ultraviolet LED Sterilization and Disinfection prepared by the Enterprise Alliance, but it is far from adapting to the current rapid development of deep ultraviolet LED, and more, more accurate, and more detailed deep ultraviolet LED standards still need to be introduced.

 

 

 

Fluorescent UV disinfection and sterilization products mainly include air sterilization, surface sterilization, water sterilization, medical sterilization and other series of products. The company 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, many types of sterilization module products have been put into the market. For more details, please visit the company's website at www.qdyingguang.com, contact the company or follow the wechat official account.

 

 

 

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