What does LED mean, the principle of LED?
What does LED mean?
What do we mean by the word LED? LED (Light Emitting Diode, LED) is an abbreviation for LED, also known as LED, is a solid-state semiconductor device that directly converts electricity into light. This kind of semiconductor component has been generally used as an indicator light and a display panel. However, with the increase of technology, it has been used as a light source. It can directly convert electric energy into light energy with high efficiency, and has a maximum of tens of thousands of hours. ～100,000 hours of service life, not only the traditional light bulb is fragile, and can save electricity, and has environmentally friendly mercury-free, small size, can be applied in low temperature environment, light source has directionality, causing less light damage and rich color gamut Etc.
With the advent of white LEDs and the introduction of more technologies, lighting devices such as indicator lights, automobile anti-fog lamps, and indoor lighting in household appliances and notebook computers are becoming more and more popular, and the application of LEDs is becoming more and more popular.
In 1955, Rubin Braunstein of the Radio Corporation of America discovered the infrared radiation of gallium arsenide (GaAs) and other semiconductor alloys. In 1962, Nick Holonyak Jr of General Electric Company (GE) of the United States Developed LED LEDs for visible light. However, the real take-off of LEDs began to be gradually gained attention after the appearance of white LEDs in the 1990s, and the application surface became more and more extensive.
LED lighting principle
So what is the working principle of LED? LED is an electronic component that can convert electrical energy into light energy. At the same time, it has the characteristics of a diode, that is, it has a positive pole and a negative pole. The most special thing about LED is that it can only emit light when it is energized from the positive pole, so it is generally given When DC is applied, the LED will illuminate steadily, but if AC is connected, the LED will flash and the flashing frequency will depend on the frequency of the input AC. The principle of LED illumination is the application of voltage, which allows electrons to be released in the form of light after they are combined in the semiconductor. At present, different types of LEDs developed by the global industry can emit light of different wavelengths from infrared to blue, and the industry also has purple-ultraviolet LEDs. In recent years, the most attractive development of LEDs is to apply fluorescent powder on blue LEDs. , white light LED products that convert blue light into white light. The reason why LED is called the new source of the century is that the LED has the characteristics of point light source and solid state light source, which can save energy, high shock resistance, long life, small volume response, and high color saturation.
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