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The full interpretation of leds

LED is a Light Emitting Diode, Chinese meaning is: light-emitting Diode, LED is a kind of Diode, is a kind of the solid-state semiconductor device of electric energy into Light energy, it can directly convert electrical energy into Light energy below and see how it works:

In 1955, Radio Corporation of America (Radio Corporation of America) of Rubin Braunstein found gallium arsenide (GaAs) and infrared radiation, and other semiconductor alloy in 1962 America's general electric (GE) Nick Holonyak Jr. has developed a visible light red leds, at that time, can only be used for Radio lights, brightness is extremely low.

After nearly 30 years of development, to 1993 Japanese nichia developed in gallium nitride (GaN), the world's first blue light-emitting diodes (leds), and laid a solid foundation for the three primary colors, and to make great contributions to the development of white LED after everyone is familiar with leds, already can emit red, orange, yellow, green, blue and so on a variety of colours. However, the white leds needed for illumination only developed after 2000-05.

An LED light source made of semiconductor p-n luminescence was first introduced in the early 1960s. When materials are used in the GaAsP, glowing red (650 nm wavelength lambda p =), when the drive current to 20 ma, luminous flux only several lumens per thousand, corresponding luminous efficiency is about 0.1 lumens/watt.

In mid - 70 - s, the introduction of elements and N, make the LED green light (555 nm wavelength lambda p =), yellow (lambda p = wavelength 590 nm) and orange light (610 nm wavelength lambda p =), luminous efficiency is also improved to 1 lumens/watt.

By the early 1980s, there was a GaAlAs LED light source, which made the light-viewing efficiency of red leds up to 10 lumens per watt.

In the early 1990s, the development of two new materials, red and yellow, GaAlInP with green and blue light, LED to a significant increase in light-viewing efficiency of leds. In 2000, the former made of LED in the red, orange (lambda p = 615 nm) of photosynthetic efficiency of 100 lumens per watt, while the latter is made of LED in the green area (lambda p = 530 nm) of luminous efficiency can reach 50 lumens/watt.

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