In 1962, the first practical visible light LED appeared. Now LED has reached a very high level. LED has been widely used as an ideal substitute for light bulbs, neon lights and light pipes. And people expect that with its further development, LED will completely replace the above-mentioned light source, the future of mankind will be brighter, because the use of LED can save a lot of energy, money and time, the development of LED can be divided into one stage: red LED The emergence of blue LEDs and the emergence of white LEDs, red and green have been developed for decades, but they are all monochromatic LEDs. If you let it be a light source, the object will be covered with a layer of color, not the color of the object itself, so the application of LED has certain limitations.
The ultimate goal of LED development is high-brightness white LEDs, which can completely replace traditional light sources. This is a long and arduous road. Until the Japanese scientist Nakamura Suzuki made a blue LED with a crop in 1993, the development of this breakthrough LED has played a decisive role. Based on the role of this blue LED, white light LEDs were soon invented in 1997, and since then LED products have been widely used in various fields and are considered to be future lighting sources.
What is an LED?
LED light-emitting diode is a fixed semiconductor device that can directly convert electricity into electricity. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a bracket. One end is a negative pole and one end is a positive pole, so that the entire wafer is looped. The oxygen resin is encapsulated. The semiconductor wafer is composed of two parts, one part is a P-type semiconductor, in which the hole is dominant, and the other end is an N-type semiconductor, which is mainly electrons here. When the two semiconductors are connected, a PN junction is formed between them. When a current is applied to the wafer through the wire, the electrons are pushed to the P region. In the P region, the electrons are combined with the holes, and then the energy is emitted in the form of photons. This is the principle of LED illumination, and the wavelength of the light. That is, the color of light is determined by the material that forms the PN junction.
Features and benefits
The intrinsic characteristics of the LED determine that it is the most ideal light source to replace the traditional light source, and it has a wide range of uses.
?small volume
The LED is basically a small chip that is encapsulated in epoxy, so it is very small and very light.
Low power consumption
LED power consumption is very low, generally the operating voltage of the LED is 2-3.6V, and the operating current is 0.02-0.03A. This means that it consumes no more than 0.1W.
?long lasting
At the right current and voltage, LEDs can last up to 100,000 hours.
1
Ultra-Fast Scanning External Cavity Tunable Laser
Ultra-Fast Scanning External Cavity Tunable Laser,Tunable Diode Laser Analyzer,Applications Tunable Laser,Tunable O-Band Laser
AcePhotonics Co.,Ltd. , https://www.acephotonics.com