LEDs with a service life of up to 10,000 hours have been used as indicators for some of the car's front dashboards for more than 30 years; but later solid-state lighting applications used high-intensity LEDs because of their operating temperature The environment is too high and sacrifices the service life of several years.
Researchers at the Oak Ridge National Laboratory (ORNL) recently announced that they have used a graphite foam material to extend the life of LEDs and even enable the operation of high-brightness LEDs. The temperature drops to the same level as the dashboard LEDs , making them last longer. ORNL has recently exclusively licensed the graphite foam technology to LED North America, a company independent of the laboratory.
ORNL said that reducing the operating temperature of the LED by ten degrees will double its service life; so local governments can replace existing mercury street lights with LED lights to save millions of dollars in electricity bills without There is a risk of immature technology that the LED lamp may overheat. In the future, LED North America intends to use a low-temperature operation of graphite foam heat sinks to provide a new generation of street light, garage light solutions, and a longer service life than other competing products.
Graphite foam is similar to foamed plastic (Styrofoam), light and porous, with a density of 25%; this makes the material easy to make into a heat sink. This kind of heat sink made of pure carbon material is said to have much better thermal conductivity than the traditional metal heat sink; ORNL said that the wick of the foam "wick" was originally insulated, not like the traditional The heat sink will raise the temperature with the LED.
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