At present, the pace of commercialization of semiconductor lighting is accelerating, but the time for LEDs to be used in the general lighting market is still short. In addition to the high price of products, there are still many matures in the application technology, which hinders the comprehensive promotion of LEDs. . So, what are the main technical obstacles of LED in the field of general lighting? What should enterprises increase their investment fields? How can we better achieve breakthroughs? In response to the above questions, the reporter interviewed Wu Enbo, vice president of Hong Kong Applied Science and Technology Research Institute. Doctor.
Application technology innovation and breakthrough point Reporter: At present, many companies are very optimistic about the future development prospects of LED in the field of general lighting, but in terms of the current market launch effect, it is still not ideal, except for higher prices, consumers In addition to factors such as insufficient LED awareness, what are the obstacles in the application technology?
Wu Enbai: LED lighting involves a wide range of applications. Different types of lamps have different applications and performances, so the application technology problems involved are relatively different. But in essence, LED is a kind of semiconductor device that can emit light. When it is used for illumination, whether it is in the form of bulbs, downlights, or in the form of spotlights and tube lamps, it will always be in the hearts of consumers. Think of it as a lighting product, each lighting product will have a relatively fixed use situation, and the current LED industry developed products, whether it is chips, packaging, or application products, often with the use of traditional products There is a certain gap, which will cause a certain gap. This barrier is often caused by the fact that current LED technology does not reach the level that consumers need. Therefore, this barrier is the most difficult problem to be overcome in current LED application technology. Its solution is closely related to technological progress.
For example, incandescent lamps have been in use for hundreds of years now. In the application process, people have developed relative habits and fixed use scenarios, such as 360 lighting. This is one of the scenarios in which incandescent lamps are used, which in turn affects the choice of LED bulbs. However, LED is a kind of light source with strong directivity. It is difficult to form the illumination angle of 280 or higher required by the US Energy Agency. It can be seen that in the context of the use of bulbs, there is a gap between the optical design of LEDs and the actual needs. Taking MR16 as an example, there is no enterprise that can replace the LED spotlights that replace 50WMR16. The main reason is that the heat dissipation problem cannot be solved. How to dissipate heat on such a limited surface area involves the thermal limitations of LED application technology.
Therefore, fundamentally speaking, to solve these barriers, we need to have a deep understanding of each product, to achieve the required performance of LEDs, technical improvements related to the optical design of the lamps, thermal design, electrical design, materials at high temperatures The durability, the service life of the material, and the balance between material life and price.
Reporter: Since the development of LED lighting technology involves many disciplines such as light, electricity and heat, it requires interdisciplinary integration at the application technology level. What do you think the company should do in order to better achieve breakthroughs in the R&D process?
Wu Enbai: The main practice of Hong Kong ASTRI is this: If you want to develop a spotlight, you will set up a special spotlight development team. Because of the knowledge of many disciplines such as light, electricity and heat, the research team must have knowledge of different aspects of optics, electricity, thermals, packaging, etc., focusing on the patented technology research required for the development of this spotlight. , testing, and finally complete the entire project. I think this model can also be applied to other Chinese companies. The most important thing to note in the R&D process is that companies must focus on and develop from the perspective of lighting products rather than the usual thinking of the LED industry.
If we are considering the layout of LED application technology development from the national level, I think it should pay more attention to the global patent analysis and standard formulation. These are all things that companies can't do, or they don't do economically (there are problems with repeated investments). Only through the power of the state, it is more appropriate to ask the appropriate research unit or appropriate institution to do it. These studies have a very important and high-level guiding role for China to win a world-class semiconductor lighting industry. Previously, the state also carried out some patent analysis, deployment recommendations, and the development of relevant standards. But more resources should be invested to make them clearer. For example, which technical directions will have greater patent risk of lightning strikes, where can be developed, where needs cooperation, and how to conduct close-crossing attacks, etc., should make a clearer analysis and judgment.
Reporter: What is the key direction of the development of LED lighting technology in ASTRI? How can the completed technical achievements cooperate with enterprises?
Wu Enbai: The deployment of Hong Kong ASTRI in LED lighting technology is relatively complete. At the LED chip level, we are mainly engaged in the development of ultra-high power vertical chips, which have about 9 US patents and 9 Chinese patents. Due to the development of technology and the complete deployment of patents, there will be good development potential in this area.
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