With LED technology in recent years has attracted widespread attention as a new generation of lighting technology, LED power increase, cooling problems will increasingly great importance. Zhi Sheng Wei Hua Thermal Coatings long-term researchers observed that the LED light failure, or life is directly related to the junction temperature and junction temperature heat is not good, and the short-lived.
Unlike incandescent and fluorescent lamps used in the past, their energy loss is great, but the majority of the energy is directly radiated out via infrared, the heat generation of the light source; LED, in addition to visible light energy consumed, the other energy converter into heat. In recent years, electronic products gradually to the high-density, highly integrated development, Led product is no exception, Led cooling So, to solve the problem to become the main problem today to improve Led performance, the development of the Led industry.
LED heat reasons led light distributor:
The LED heat because not all because the added energy into light energy, but part is transformed into heat. LED light efficiency is only 100lm / W optical conversion efficiency of only about 20 to 30%. Means that about 70% of the energy into heat.
Specifically, the generation of the LED junction temperature led light distributor is caused due to two factors:
1. The internal quantum efficiency is not high, that is, when the electron and hole recombination and not 100% of the resulting photon, often referred to as the carrier recombination rate by the current leakage in the PN area to reduce. The leakage current is multiplied by the voltage is this part of the power that is converted into heat, but this portion does not occupy a main component, because now has close to 90% efficiency of internal photon.
2. All internally generated photons can not emitted to the outside of the chip, while the last is converted into heat and this part is the main, because the current such as the external quantum efficiency of only about 30%, most are converted into heat.
As said before, although incandescent light efficiency led light distributor is very low, only about 15lm / W, but it is almost all energy into light energy and radiated out, because most of the radiation is infrared light efficiency is very low , but it eliminates the problem of heat dissipation.