LED is called the fourth generation light source or green light source with many advantages. But the LED heat sink has been a problem to be solved!
How LED junction temperature of the chip are made?
Specifically, the LED junction temperature is caused by two factors.
Specifically, the LED junction temperature is caused by two factors.
1.Internal quantum efficiency is not high, that is, when electron and hole complex, and not 100 produces photons, commonly referred to by the " current leakage " and reduce the composite rate carrier PN. Leakage Current times the voltage is this part of the power, which is converted into heat energy, but this section does not account for the main ingredient, because the internal efficiency of the photon is close to 90 percent now.
2.Internally generated photons cannot be all fired outside the chip and the last converted into heat, which is the main reason, because this is called the external quantum efficiency of only about 30, most of them were converted into heat.
LED heat sinks is becoming more and more attention by people, this is because the LED light failure and lifespan are directly related to the junction temperature, the thermal well junction temperature is high, life is short.
Applications of high power LED in white light and LED chip thermal solution.
From the perspective of high - power LED white light market prices. Today's high power LED is also a noble products, because of high - power LED light price was too high, and the technology still remain to be improved on, so high - power white LED products are not want to be able to use for everyone.
2.Internally generated photons cannot be all fired outside the chip and the last converted into heat, which is the main reason, because this is called the external quantum efficiency of only about 30, most of them were converted into heat.
LED heat sinks is becoming more and more attention by people, this is because the LED light failure and lifespan are directly related to the junction temperature, the thermal well junction temperature is high, life is short.
Applications of high power LED in white light and LED chip thermal solution.
From the perspective of high - power LED white light market prices. Today's high power LED is also a noble products, because of high - power LED light price was too high, and the technology still remain to be improved on, so high - power white LED products are not want to be able to use for everyone.
In recent years efforts of experts in the industry for high-power LED chip thermal offers a several - point improvement plan :
1.By increasing the area of LED chip to increase the amount of light.
2.Using a number of small LED chip package.
3.Changing the LED packaging materials and fluorescent materials.
1.By increasing the area of LED chip to increase the amount of light.
2.Using a number of small LED chip package.
3.Changing the LED packaging materials and fluorescent materials.
Characteristics of LED chips are produced in very small volume of extremely high heat. Heat capacity of the LED itself is very small, so must be the fastest speed these heat conduction out, otherwise, it causes a high degree of junction temperature. In order to improve the cooling of the LED chip itself, its main improvement is the use of better thermal conductivity of the substrate The materials. Thermal resistance because companies like Cree LED by the end of Silicon Carbide for the Base, to low thermal resistance of at least 1 times more than other companies.
At last, when we consider how to offer customer better solution on the heat sink, we should take product material, PBC board, package material and structure all into account. Written from http://www.hideeled.com
excellent post about the LED Heat sink india
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