The LED chip is a solid semiconductor device. The heart of the LED is a semiconductor chip. One end of the chip is attached to a bracket, one end is a negative electrode, and the other end is connected to the positive electrode of the power supply, so that the entire chip is encapsulated by epoxy resin. So, what are the points of LED high -power lamp bead's LED chip technical difficulties? Especially for high -power LED chips, the main technical difficulties they face are mainly the following aspects:

    1. Low light emission efficiency

      Although the packaging efficiency of white light LEDs after mass production of various manufacturers has reached 100LM/W, its light efficiency is still very low compared to smaller LED chips. Due to the large size of LED chips, when the light is transmitted inside the device, the distance passes through the light is longer than the small -sized chip. The inside of the device is unable to output, resulting in low light efficiency.

      2. Unewal current diffusion

      For high -power LED chips, a large current driver is required (generally 350mA). In order to obtain a uniform current diffusion, a reasonable electrode structure needs to be designed to make the current evenly distribute at the P -type level. Due to the size of the chip size, the high -power LED chip is due to the size of the chip size It is large, and at the same time, the current of the P -shaped layer is difficult to get a uniform diffusion at the P -type level, resulting in the accumulation of the current under the electrode, resulting in the current crowding effect. Due to the current accumulation effect, the current is mainly concentrated in the area directly below the electrode, the horizontal expansion is relatively small, and the current distribution is very uneven, resulting in too much local current density.

      3. Unstable photoelectric characteristics

      Due to the light efficiency of high -power LED chip device, a large amount of light is absorbed inside the device. These absorbed light converts the inside of the device to heat energy, causing the LED chip to increase the temperature. It seriously affects the life of the LED chip. At the same time, the increase in temperature will cause the chip's Blu -ray peak to shift towards the long wavelength direction (that is, red shift), causing the wavelength of the chip to not match the wavelength of the fluorescent powder, which will also cause color rendering, which will also cause color rendering Reduction.

      4. Industrialization research is far lower than the level of laboratory research and development

      Although the mainstream LED chip manufacturer internationally, although the laboratory research and development has reached a higher level, the level of industrialization research is still underneath. The main reason for it is that industrialization must not only take into account the cost of cost, but also take into account the production process. The degree of complexity and the quality of chip.