Led light is a light-emitting element made of semiconductor material that emits light when it is energized. The material uses III-V chemical elements. The principle of light-emitting is to convert electrical energy into light, that is, to apply current to compound semiconductors through the combination of electrons and holes. Excess energy will be released in the form of light to achieve a luminous effect, which belongs to cold luminescence.
The biggest feature of LED light is: no warm-up time, fast response speed, small size, low power consumption, low pollution, suitable for mass production, high reliability, and easy to make extremely small or array elements according to application needs. , It has a wide range of applications, such as automobiles, communication industries, computers, traffic lights, backlights for LCD panels, LED screens, etc.
The LED light industry can be divided into three categories: upper, middle and downstream. The upstream is the single chip and its extension, the midstream is the LED chip processing, and the downstream is the packaging test and application. Among them, the upstream and midstream technology content is relatively high, and the capital investment density is high. From upstream to downstream, there is a considerable gap in product appearance. The color and brightness of LEDs are determined by epitaxial materials, and epitaxy accounts for about 70% of LED manufacturing costs, which is extremely important to the LED industry.