Electronic enthusiasts network [translation / Joyce] Today, LED has entered thousands of households, has become a common technology in our lives. On the 50th anniversary of the emergence of visible light LEDs, let us review the development of LEDs together, understand the types of LEDs, and how you can use LED technology.
1. History of LED
LED technology comes from the principle of electroluminescence. At the Marconi Laboratory in the United Kingdom in 1907, HJ Round used the cat ’s beard as a wire to connect the positive and negative poles of the silicon chip. After energization, electroluminescence occurs. However, because the yellow light it emitted was too dark at that time, it was not suitable for practical applications; the more difficult thing was that silicon carbide did not adapt well to electroluminescence, so the research was abandoned. In 1961, real LEDs appeared. Two Texas Instruments researchers used a piece of gallium arsenide to make infrared light and obtained a patent for LED. By 1962, GE scientist Nick Holonyak invented the world's first practical visible-spectrum light-emitting diode (LED). Unlike infrared lasers, the light it emits is visible to the human eye. LEDs at that time were quite expensive, each costing $ 200. It wasn't until 1968 that a company began mass-producing red LEDs with gallium arsenide. In the same year, HP also used the company's gallium arsenide (GaAs) to produce LEDs and used them in its own calculator. After that, people made LEDs with different luminous colors using materials different from GaAs.
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