Lighting applications are an important field of semiconductor technology. LED， Light emitting diodes are lighting technologies based on semiconductor transistors. Compared with traditional light sources, LEDs have the characteristics of small size, flat packaging, low heat generation, energy efficiency, long lifespan, and fast response. In addition, it also has the advantage of being green and environmentally friendly. Therefore, LED has rapidly become popular and has become a new generation of high-quality lighting sources. It is widely used in various fields such as traffic lights, electronic product backlights, urban night scene beautification light sources, and indoor lighting.