LED is known as the fourth-generation lighting source or green light source. It has the characteristics of energy saving, environmental protection, long life, and small size. It can be widely used in various indications, displays, decorations, backlights, general lighting and urban night scenes. Various enterprises have launched a fierce technical competition in LED research and development. However, LED heat dissipation has always been an urgent problem to be solved.

The reason why LEDs generate heat is that part of the input electrical energy is not completely converted into light energy, but converted into heat energy. At present, the light efficiency of LED is only 100lm/W, and its electro-optical conversion efficiency is about 20~30%, that is, about 70% of the electric energy is converted into heat energy.

There are two main reasons for the LED junction temperature:

1. The internal quantum efficiency is not high, that is, when electrons and holes recombine, not all photons are generated, which is called "current leakage", which leads to a decrease in the recombination rate of carriers in the PN region. The leakage current multiplied by the voltage is this part of the power, which is converted into heat energy. But this is not the main ingredient, because the internal photon efficiency is close to 90% at present.

2. The internally generated photons cannot all escape the chip and are converted into heat. This is the main factor, because currently this conversion rate, known as external quantum efficiency, is only about 30 percent, most of which is converted to heat.

Although the luminous efficiency of an incandescent lamp is very low, only about 15lm/W, it converts almost all electrical energy into light energy and radiates it out. Because most of the radiant energy is infrared, the luminous efficiency is low, but it avoids cooling problem.

Nowadays, people pay more and more attention to the heat dissipation of LEDs, because the light decay and lifespan of LEDs are directly related to the junction temperature, and poor heat dissipation will cause the junction temperature to rise, thereby shortening the lifespan.

The LED chip will generate high heat in an extremely small volume, and the heat capacity of the LED itself is very small, so the heat must be conducted out at the fastest speed, otherwise the junction temperature will rise. In order to guide the heat away from the chip to the greatest extent, materials with good thermal conductivity have been developed for products such as LED lamps, such as thermally conductive silicone grease and other thermally conductive interfaces.

For the LED market, targeted products have been developed successively. In addition to good thermal conductivity, other properties of materials are also given to facilitate customers' use.

Huayue thermal conductive silicone grease series has the characteristics of fine paste, low thermal resistance and high thermal conductivity.