[Hui Cong Lighting Network] Regarding the future of LED, the audience and the professor of Shenzhen University Architecture Department Zhao Haitian, Tsinghua University Shenzhen Graduate School of Electronic Physics and Laser Devices Associate Researcher; Tsinghua University Shenzhen Graduate School of Semiconductor Lighting Laboratory Deputy Director Qian Keyuan, Dr. Foxconn Yang Changjiang and Fuchang Electronics representatives conducted a detailed discussion.
Cooling is not the most deadly problem with LEDs
Question: I am from Dongguan, specializing in radiators. Regarding the problem of LED heat dissipation, I would like to ask experts about how to look at the prospects of LED light radiators. Special heat dissipation materials are made of aluminum alloy and pure aluminum. There are even magnesium alloys. I would like to ask experts, which one is the best and what is the development prospect?
Qian Keyuan: I mentioned the radiator just now. I will talk about this idea. Cooling is not the most deadly problem of LED. LED will definitely improve. When it is 80-90% efficient, the heat will be much smaller. Experts engaged in construction have said that LED lights will go to two extremes, such as spotlights, of course, the ultimate ultimate goal is the projector. There is also reflection, the home lighting flood is the most comfortable, there is no need to screw a light bulb on the lampshade, if the floodlighting is definitely a large area, the pursuit of a large area, then heat is not a big problem, now light The effect is not so high. For example, if it is 200lm/w, the current lamp will be reduced by half. I think the heat dissipation will be more and more simple. I just talked about aluminum alloy, aluminum alloy and copper. I think the aluminum alloy is quite good. Of course, aluminum and cast aluminum may have some cost considerations.
Teacher Zhao: I recently read an article. The heat dissipation problem has two meanings. The first is to compact your substrate and the heat shield outside of you. The thermal resistance of the gap is the largest. Second, the outer cover and the external heat dissipation are two ways. One is radiating heat energy outward, and the other is convection heat dissipation. From our current situation, convection heat dissipation is the main one. How to increase the degree of convection heat dissipation? It is related to the roughness of the surface material and also the direction in which the material is placed. This is probably the case. Further specific technical issues may have to be discussed in private.
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