LED is the abbreviation of English light emitting diode (LED) LED has a small amount of heat and less power consumption. It is used for indicator light 1. Voltage: LED uses low voltage power supply, the supply voltage is between 6-24V, varies according to the product, so it It is a safer power source than the use of high-voltage power supplies and is particularly suitable for use in public places. 2. Efficiency: 80% less energy consumption than incandescent lamps with the same efficacy 3. Applicability: Very small, each unit LED chip is a 3-5mm square, so it can be prepared into various shapes of devices, and is suitable for easy Changed environment 4. Stability: 100,000 hours, 50% of the initial light decay. 5. Response time: The response time of its incandescent lamp is in the order of milliseconds, and the response time of the LED lamp is nanoseconds. 6. Contamination to the environment: None Hazardous metal mercury
7. Color: change the current can change color, light-emitting diodes easily through chemical modification methods, adjust the energy band structure and band gap of the material, to achieve multi-color red orange green blue light. If the current is a red LED, with the increase of the current, it can turn orange, yellow, and finally green 8. Price: LED prices are more expensive, compared to incandescent lamps, the price of several LED can be The price of an incandescent lamp is comparable, and usually each group of signal lamps needs to be composed of 300 to 500 diodes. LED (Light Emitting Diode), a light emitting diode, is a solid state semiconductor device that can directly convert electricity into light. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a support, one end is negative, and the other end is connected to the positive electrode of the power supply, so that the entire wafer is encapsulated with epoxy resin. The semiconductor wafer consists of three parts, one is a P-type semiconductor, in which holes are dominant, and the other end is an N-type semiconductor, which is mainly electrons on this side, and usually has 1 to 5 cycles of quantum wells in the middle. When current is applied to the wafer through the wire, electrons and holes are pushed into the vector well. In the quantum well, electrons recombine with holes, and then they emit energy in the form of photons. This is the principle of LED light emission. The wavelength of light is also the color of light, which is determined by the material that forms the PN junction. The simple thing is that when the electron jumps to the hole, because the energy of the electron is more than the volume of the hole, the part of the energy is more. The situation of light is coming