[Source: Gaogong LED's "LED Good Products" January issue (total issue 61) | Xu Chaopeng] Previously, there were two methods for manufacturing white LEDs in the field of LED semiconductors: the first one, using three in colorimetry The principle of primary color, the red, green and blue light-emitting diodes are polymerized to some extent, and the white LED is obtained after controlling the output ratio; the second is to apply the phosphor on the surface of the blue LED, and the phosphor is irradiated by blue light. After the yellow light is emitted, the yellow light is mixed with the remaining portion of the blue light to form a white LED.
However, in recent years, the third method of obtaining white LEDs is gradually emerging in the industry. Previously, the Japanese Nominea who won the Nobel Prize for inventing the "Blue LED" has been in the field of exploration and research. This is the UV LED that has been the focus of the industry for a long time.
It is understood that the ultraviolet light emitted by the ultraviolet LED itself is higher than the blue light, so the prepared white LED light effect can be further improved, and the spectral range is wider and the color rendering index is higher. Therefore, some insiders claim that UV LED will become the development trend of white LED in the future.
Attention to enhance <br> <br> In recent years, the development of domestic UV LED technology relatively quickly, including Jason Qingdao, Xi'an and other companies for both domestic first set foot in the field who. In June of this year, Hongli Optoelectronics and Qingdao Jiesheng launched a strategic cooperation agreement to jointly develop the UV LED market, which also marks that some domestic large LED companies have begun to enter the UV LED market.
"Current UV LED technology is mainly used in biomedical, anti-counterfeiting, air purification, data storage and military aviation. It is mainly based on special lighting. With the continuous development of UV LED technology, new application products will continue to emerge to replace the original There are products in the field," said Qiao Wei, senior project leader of Hongli Optoelectronics.
In addition, UV LEDs are also widely used in photocuring, UV development, rock detection, trace detection, and archaeological applications. Moreover, Europe, Japan, the United States and other countries and regions will realize the replacement of mercury-excited ultraviolet light source in some application fields within 3-5 years, and GaN-based ultraviolet LED will be the only solid-state light source to replace the mercury-excited ultraviolet light source. Program.
Compared with the traditional mercury lamp, the ultraviolet LED has the following advantages: First, the ultraviolet LED can freely control the band, while the conventional mercury lamp is a full band, and its spectral peaks are more; second, the ultraviolet light unit area light intensity ratio The mercury lamp is more than 1000 times higher, but the light output consumes only 1/10 of the mercury lamp. Third, the UV LED is not affected by the chemical equilibrium conditions such as temperature, concentration and activity. The sterilization process can be non-toxic and non-toxic. Residue, no odor, especially suitable for disinfecting the surface of air, water and objects.
“And, currently, different types of UV devices have different uses. For example, A-band (200-280nm) is often used for water, air and surface disinfection; while B-band (280-315nm) is used for light. Medical, protein analysis and drug testing; C-band (315-400nm) for UV curing, anti-counterfeiting technology, solarium, lithography, photocatalysis and other fields." Chaucer mentioned.
"In fact, currently in the domestic UV LED market, more applications should belong to the A-band, which is used in the curing field. For example, in the curing of organic rubber, its cost performance and technology have gradually matured, and the output is gradually increasing. There are very few application products in the band, which is caused by the difficulty of its own manufacturing process. At the same time, under the same price conditions, the power of C-band products is still lower than other bands.” Zhang Guohua, general manager of Qingdao Jiesheng Electric Co., Ltd. Tell the reporter.
“However, considering the wide application characteristics of C-band UV LEDs, Qingdao Jiesheng has developed C-band UV LED products this year, and it is one of the few domestic manufacturers. It is currently in the market supply stage. The unit price of the product is about 50-100 yuan." Zhang Guohua said that the company's next goal will be to further reduce costs, in order to achieve the price target of 20 yuan on the premise of mass supply.
Application outlook <br> <br> reporter was informed that although in recent years the domestic UV LED industry has made great progress, but the problem of production capacity still exists. The reason is that on the one hand, it is related to the current domestic demand shortage, and the company has not yet done a good job of high-volume supply of technical reserves; on the other hand, the uncertainty of the industry has also led companies to rush to expand production.
In addition, the current low profit margins in the industry also lead to the company's capital chain can not function properly, if the increase in production capacity is tantamount to self-seeking. Therefore, under the current development situation, the development trend of the domestic UV LED industry is still very serious.
"In the current LED lighting market, we are still in the era of LED LED products, but the technology patents of Blu-ray LEDs are controlled by countries such as Europe, America and Japan that are engaged in the industry earlier. Therefore, UV LED is the only way we can break through the patent monopoly. The excellent field." Xi'an Zhongwei Optoelectronics Technology Co., Ltd. General Manager Yang Jianke said that UV LED will be the key to domestic enterprises occupying the commanding heights of the future technology, so domestic LED companies need to focus on it.
"What we need to do now is to improve the quality of technology, seek strategic cooperation, and integrate horizontally and vertically in the industrial chain to achieve the security of the capital chain. In addition, we can find a way out from the terminal application field to achieve market. Widely expanded." Xi'an Zhongwei Optoelectronics Technology Co., Ltd. General Manager Yang Jianke said that the current UV LED market is an urgent problem to be solved to find a breakthrough that can be widely used by end customers.
"In the blue LED market, for example, its development process has a total of three wave climax: the first wave, the early mobile phone backlight field, after being widely applied, gradually transitioned to the second wave of climax, TV backlight field, and even the current The third wave of climax, the field of general lighting. The market level gradually expanded and eventually developed." Zhang Guohua said that this is a breakthrough in the current UV LED market. Once this problem is solved, the UV LED market will usher in a blowout. development of.
"The future application prospects of UV LED will far exceed people's imagination. Whoever can take the lead in this industry, who will discover the new blue ocean of industry development. And, the current wind vane in the field of LED lighting, by inventing blue light Tianye Hao, who won the Nobel Prize for LED, is now focusing on the research and development of the UV LED field, which also represents the development direction of the industry to some extent." Zhang Guohua believes that the UV LED market is like a sleeping lion once the market Gradually launched, with its vast application area, it will burst out more energy than blue LEDs.
