history of led chips
People have understood the basic knowledge that semiconductor materials can generate light 50 years ago. In 1962, Nick Holonyak Jr. of General Electric developed the first practical application of visible light emitting diodes. LED is the abbreviation of English light emitting diode (light emitting diode), its basic structure is a piece of electroluminescent semiconductor material, placed on a leaded shelf, and then sealed with epoxy resin around, that is, solid encapsulation, so it can play To protect the internal core wire, so the LED has good seismic performance.
Initially, LEDs were used as indicator light sources for instruments and meters. Later, LEDs of various light colors were widely used in traffic signal lights and large-area display screens, resulting in good economic and social benefits. Take a 12-inch red traffic light as an example. In the United States, a long-life, low-efficiency 140-watt incandescent lamp was originally used as the light source, which produces 2000 lumens of white light. After passing through the red filter, the light loss is 90%, leaving only 200 lumens of red light. In the newly designed lamp, Lumileds uses 18 red LED light sources, which consumes a total of 14 watts, including circuit losses, to produce the same light effect. Automotive signal lights are also an important field of LED light source applications.
